CN108411074B - A kind of manufacturing method of quenched homogeneous target - Google Patents

Abstract

The invention relates to the field of metallurgy and pressure processing, and discloses a method for manufacturing a quenched and tempered homogeneous target plate. The method includes sequentially performing press forging, annealing treatment, mechanical processing and quenching and tempering treatment on a steel ingot, and the annealing treatment adopts the following steps: The steps of the following process are carried out: the target plate obtained after forging by the press is heated to the first temperature, and kept at the first temperature for 2 to 4 hours; the target plate is heated to the second temperature, and at the second temperature Keep the target plate for 4-6 hours; lower the target plate to the third temperature and keep it at the third temperature for 5-7 hours; raise the target plate to the fourth temperature and keep it at the fourth temperature for 25-35 hours; The plate is cooled to 350-450°C, and then cooled to below 200°C. The quenched and tempered homogeneous target plate produced by the above method of the present invention has uniform planar structure, uniform hardness and small performance anisotropy.

Description

A kind of manufacturing method of quenched and tempered homogeneous target plate

technical field

The invention relates to the fields of metallurgy and pressure processing, in particular to a method for manufacturing a tempered and homogeneous target plate.

Background technique

The problem of penetration and penetration of the target plate under the impact of kinetic energy projectiles has attracted people's attention for hundreds of years, and scholars from various countries have done a lot of research on this problem. The so-called penetration means that the projectile has not completely penetrated but has entered the target body, which causes the projectile to embed and form a crater. The so-called penetration means that the projectile completely penetrates the target body.

Homogeneous target plates are usually used to test the penetrating ability of armor-piercing projectiles. According to this use condition, it is required that the homogeneous target plate has uniform structure, uniform hardness, and small anisotropy in performance. The general specification of the target plate size is usually 10-250mm*1200-1500mm*1500-1800mm (thickness*width*length). This kind of target plate is generally produced by continuous casting slabs and large-scale hot rolling mills. Homogeneous target plates with a thickness of more than 300mm, due to the limitation of the size of the continuous casting slab, the production rolling ratio of the rolling mill is insufficient and cannot meet the standard requirements.

Quenching and tempering is the key process of target plate manufacturing. The traditional target plate quenching and tempering method generally uses oil or water and double liquid quenching. For a target plate with a thickness greater than 300mm, the cooling rate of oil cooling is slow, and the core structure of the target plate is not uniform. Insufficient hardness. The operation of water refueling dual liquid cooling is cumbersome, the temperature and time are difficult to control, and the cutting is easy to crack. Final product fracture morphology cannot be guaranteed. An accurate test of the penetrating capabilities of armor-piercing projectiles.

Therefore, how to obtain a target plate with unlimited thickness, small anisotropy, unaffected by tensile stress, uniform structure and uniform hardness of the entire target plate, and effective prevention of cracking and deformation by controlling the process parameters of each link has become the current armor-piercing projectile. An urgent problem to be solved in the field of penetration testing.

Contents of the invention

The object of the present invention is to provide a manufacturing method capable of obtaining a target plate with uniform planar structure, uniform hardness, and small performance anisotropy.

In order to achieve the above object, the present invention provides a method for manufacturing a quenched and tempered homogeneous target plate. The method includes sequentially performing press forging, annealing treatment, machining treatment and quenching and tempering treatment on the steel ingot, wherein the annealing treatment adopts Include steps in the following process:

(1) Heating the target plate obtained after forging by the press to a first temperature of 650-750°C at a first heating rate of ≤80°C/h, and keeping it at the first temperature for 2-4h;

(2) heating the target plate after step (1) to a second temperature of 820-920°C at a second heating rate of ≤100°C/h, and keeping it at the second temperature for 4-6h;

(3) Lowering the temperature of the target plate after step (2) to a third temperature of 350-400° C., and keeping it at the third temperature for 5-7 hours;

(4) heating the target plate after step (3) to a fourth temperature of 630-730° C., and keeping it at the fourth temperature for 25-35 hours; and

(5) Cool down the target plate after step (4) to 350-450°C at a first cooling rate of ≤30°C/h, and then cool down to 200°C at a second cooling rate lower than the first cooling rate the following.

The quenched and tempered homogeneous target plate produced by the above method of the present invention has uniform planar structure, uniform hardness and small performance anisotropy.

Other features and advantages of the present invention will be described in detail in the detailed description that follows.

Detailed ways

Specific embodiments of the present invention will be described in detail below. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

Neither the endpoints nor any values of the ranges disclosed herein are limited to such precise ranges or values, and these ranges or values are understood to include values approaching these ranges or values. For numerical ranges, between the endpoints of each range, between the endpoints of each range and individual point values, and between individual point values can be combined with each other to obtain one or more new numerical ranges, these values Ranges should be considered as specifically disclosed herein.

The invention provides a method for manufacturing a quenched and tempered homogeneous target plate. The method includes sequentially performing press forging, annealing treatment, mechanical processing and quenching and tempering treatment on a steel ingot, wherein the annealing treatment adopts the following process: Steps to proceed:

(1) Heating the target plate obtained after forging by the press to a first temperature of 650-750°C at a first heating rate of ≤80°C/h, and keeping it at the first temperature for 2-4h;

(2) heating the target plate after step (1) to a second temperature of 820-920°C at a second heating rate of ≤100°C/h, and keeping it at the second temperature for 4-6h;

(3) Lowering the temperature of the target plate after step (2) to a third temperature of 350-400° C., and keeping it at the third temperature for 5-7 hours;

(4) heating the target plate after step (3) to a fourth temperature of 630-730° C., and keeping it at the fourth temperature for 25-35 hours; and

(5) Cool down the target plate after step (4) to 350-450°C at a first cooling rate of ≤30°C/h, and then cool down to 200°C at a second cooling rate lower than the first cooling rate the following.

Preferably, in step (1), the first temperature is 680-720°C. More preferably, in step (1), the first heating rate is 50-80° C./h.

Preferably, in step (2), the second temperature is 850-890°C. More preferably, in step (2), the second temperature increase rate is 70-100° C./h, and the second temperature increase rate is greater than the first temperature increase rate.

Preferably, in step (4), the fourth temperature is 660-700°C.

Preferably, in step (5), the first cooling rate is 15-30° C./h.

Preferably, in step (5), the second cooling rate is ≤15°C/h. More preferably, the second cooling rate is 8-15°C/h.

According to a preferred specific embodiment of the present invention, the present invention provides a method for manufacturing a quenched and tempered homogeneous target plate, the method includes sequentially performing press forging, annealing treatment, machining treatment and quenching and tempering treatment on the steel ingot , wherein, the annealing treatment is carried out using steps comprising the following process:

(1) Heating the target plate obtained after forging by the press to a first temperature of 680-720°C at a first heating rate of 50-80°C/h, and keeping it at the first temperature for 2-4h;

(2) heating the target plate after step (1) to a second temperature of 850-890°C at a second heating rate of 70-100°C/h, and keeping at the second temperature for 4-6h;

(3) Lowering the temperature of the target plate after step (2) to a third temperature of 350-400° C., and keeping it at the third temperature for 5-7 hours;

(4) heating the target plate after step (3) to a fourth temperature of 660-700° C., and keeping it at the fourth temperature for 25-35 hours; and

(5) Cool down the target plate after step (4) to 350-450°C at a first cooling rate of 15-30°C/h, and then cool down to 200°C at a second cooling rate lower than the first cooling rate below ℃.

Preferably, the step of press forging includes: carrying out at least two piercing operations on the steel ingot, then horizontally forging to the required width and then longitudinally stretching, and piercing so that the height of the steel ingot is 1/4H to 3/4H. More preferably, the press forging step includes: subjecting the steel ingot to a 2-pier and 2-drawing process, then forging it horizontally to the width required and then elongating it longitudinally, and piering so that the height of the steel ingot is 1/4H to 3/4H.

Preferably, the elongation is performed using the FM method.

Preferably, in the step of press forging, the steel ingot is first heated by the steps including the following process before performing the piercing operation: keeping at a fifth temperature of ≤600°C for 1-3 hours; and then heating at a temperature of ≤ Raise the temperature to the sixth temperature of 710-810°C at a heating rate of 80°C/h, and keep at the sixth temperature for 1-3 hours; then raise the temperature to the seventh temperature of 1100-1200°C at a heating rate of ≤100°C/h , and kept at the seventh temperature for 3 to 5 hours.

Preferably, the fifth temperature is 500-600°C.

Preferably, the sixth temperature is 740-780°C.

Preferably, the seventh temperature is 1150-1200°C.

According to a preferred specific implementation, in the press forging step, the steel ingot is first heated by the following steps before the piling operation: keep the temperature at the fifth temperature of 500-600° 1~3h; then raise the temperature to the sixth temperature of 740~780℃ at a heating rate of ≤80℃/h, and keep at the sixth temperature for 1~3h; then raise the temperature to 1150 at a heating rate of ≤100℃/h The seventh temperature of ~1200°C, and keep at the seventh temperature for 3 ~ 5h.

In the present invention, in the press forging step, for the convenience of operation, the steel ingot subjected to the 2 pier 2 drawing process can also be clamped. Moreover, in the press forging step, when the temperature of the steel ingot is reduced to below 700°C, the steel ingot is preferably reburned, and the reburning conditions include: the reburning temperature is 1150-1200°C, and the reburning The time is 60 minutes to 90 minutes.

Preferably, the conditions of the press forging step are controlled so that all parts are transformed and local coarse grains can be prevented.

The machining treatment may include: subjecting the target plate obtained after the annealing treatment to head and tail sawing treatment in the length direction, and surface milling treatment in the width direction and thickness direction, and the machining treatment makes the treated target plate The deviation of the length dimension and width dimension of the plate from the length dimension and width dimension of the target finished target plate shall not exceed ±30mm, and the deviation of the thickness dimension from the thickness dimension of the target finished target plate shall not exceed ±5mm, for example, when the size of the target finished target plate When it is 1800mm×1500mm×350mm (length×width×thickness), the mechanical processing can make the size of the processed target plate be (1800±30)mm×(1500±30)mm×(350±5)mm (length x width x thickness). Preferably, the maximum allowable deviation of the length dimension of the target plate is 30mm, the maximum allowable deviation of the target plate width dimension is 30mm, and the maximum allowable deviation of the target plate thickness dimension is 5mm.

Preferably, the tempering treatment is carried out using steps comprising the following processes:

a) Keep the target plate after mechanical processing at ≤350°C for 0.2~2h;

b) heating the target plate after step a) to an eighth temperature of 630-730°C at a heating rate of ≤80°C/h, and keeping it at the eighth temperature for 0.2-2.5h;

c) heating the target plate after step b) to a ninth temperature of 840-940°C at a heating rate of ≤100°C/h, and keeping it at the ninth temperature for 400-1000min;

d) Air-cool the target plate after step c) for 30-90 seconds, and then put it into the quenching liquid for 40-200 minutes;

e) The target plate after step d) is heated up to the tenth temperature of 600-700°C at a heating rate of ≤80°C/h for tempering treatment, and kept at the tenth temperature for 300-1500min.

Preferably, in step a), the mechanically processed target plate is kept at 280-350° C. for 0.2-2 hours.

Preferably, in step b), the target plate after step a) is heated up to the eighth temperature at a heating rate of 50-80° C./h.

Preferably, the eighth temperature is 660-700°C.

Preferably, in step c), the target plate after step b) is heated up to the ninth temperature at a heating rate of 80-100° C./h.

Preferably, the ninth temperature is 870-910°C.

Preferably, in step e), the target plate after step d) is heated up to the tenth temperature at a heating rate of 50-80° C./h for tempering treatment.

Preferably, the tenth temperature is 630-670°C.

Preferably, in step d), the target plate is treated in a quenching liquid until the temperature is 180-240° C., and the quenching liquid is released. The quenching liquid can be, for example, a water-soluble quenching medium made of polyaleneglycol (Polyaleneglycol) polymer plus water solvent in additives, polyaleneglycol is a copolymer of ethylene oxide and propylene oxide substance, referred to as PAG quenching solution, the concentration is 8-15% by weight, preferably 12% by weight.

Preferably, in step e), before performing the tempering treatment, the target plate after step d) is cooled to ≤100° C. before performing the tempering treatment.

Preferably, the steel ingot is produced by sequentially melting the steel raw material in an eccentric bottom electric arc furnace, refining outside the furnace and casting.

According to the present invention, the eccentric bottom electric arc furnace smelting process smelts steel raw materials to obtain primary molten steel.

According to the present invention, the out-of-furnace refining is carried out on the basis of refining technologies and equipment such as ASEA-SKF refining method, ladle furnace refining, LF-VD method, VAD furnace and VOD method. Preferably, the out-of-furnace refining includes: pouring the primary molten steel from the primary smelting furnace into the ladle furnace, and then performing slagging, heating, argon gas stirring, slag component adjustment, molten steel component adjustment and vacuum degassing treatment processes in sequence , to obtain refined molten steel.

Preferably, the molten steel obtained after the steel raw material is smelted in an eccentric bottom electric arc furnace and refined outside the furnace in sequence contains: 0.27-0.33% by weight of C, 0.18-0.35% by weight of Si, 0.30-0.50% by weight of Mn, 0-0.030% by weight of S, 0-0.030% by weight of P, 1.80-2.30% by weight of Cr, 1.80-3.00% by weight of Ni, 0.28-0.38% by weight of Mo, the balance being Fe and unavoidable impurities .

The method of the present invention has no special limitation on the parameters in the eccentric bottom electric arc furnace smelting, out-of-furnace refining and casting processes used to prepare the steel ingot, and those skilled in the art can prepare the steel ingot by using conventional preparation processes in the field. Preferably, the conditions for producing the steel ingot are controlled such that Cu≤0.10wt%, S≤0.008wt%, P≤0.010wt%, [H]≤2.5ppm, [O]≤15ppm in the steel ingot.

Preferably, the mechanical processing makes the obtained target plate have a thickness of 150-450 mm.

Preferably, the steel raw material is iron and steel scrap that does not become a product during the production process of the iron and steel plant (such as trimmed edges, trimmed ends, etc.) and iron and steel materials in scrapped equipment and components after use.

Preferably, the slag composition adjustment process can be carried out using materials such as lime, fluorite, ferrosilicon powder, silica, silicon-calcium powder, aluminum powder, aluminum wire, calcium-silicon wire, carbon block, and carbon powder.

Preferably, the composition adjustment process of molten steel can be carried out using materials such as ferrochrome, ferromolybdenum, nickel plate, carbon block, aluminum wire, calcium silicon wire, ferrosilicon and ferromanganese.

Preferably, the specification of the cast steel ingot is 3.5-12 tons of octagonal ingots, such as 3.5 tons of octagonal ingots, 5.2 tons of octagonal ingots, 5.5 tons of octagonal ingots, 6.5 tons of octagonal ingots, 7 tons of octagonal ingots, 8 tons of octagonal ingots and 10 tons of steel, and steel ingots of any specification between the ranges formed by any two of the above specifications.

The present invention will be described in detail below by way of examples.

In the following examples, unless otherwise specified, all raw materials used are commercially available.

In the following examples, the capacity of the ladle furnace is 40 tons.

In the following examples, the aluminum wire is purchased from Panzhihua Steel City Group Company, with a length of 200-400m and an outer diameter of ∮9-∮12mm. The calcium-silicon wire is purchased from Jiangyou Xinze Development Co., Ltd., with a length of 200m. -450m, calcium-silicon wire with an outer diameter of ∮10-∮15mm.

In the following embodiments, the cross-sectional size specification of the finished target plate is 1500mm×1800mm (width×length).

In the following examples, the quenching liquid used is: PAG quenching liquid with a concentration of 12% by weight.

Contain in the steel raw material that following embodiment 1 and embodiment 2 use: the C of 0.31% by weight, the Si of 0.29% by weight, the Mn of 0.41% by weight, the S of 0.003% by weight, the P of 0.012% by weight, the Cr of 2.08% by weight , 2.86% by weight of Ni, 0.32% by weight of Mo, and the balance being Fe and unavoidable impurities.

The steel material used in the following example 3 contains: 0.30% by weight of C, 0.26% by weight of Si, 0.40% by weight of Mn, 0.005% by weight of S, 0.010% by weight of P, 2.05% by weight of Cr, 1.92% by weight Ni, 0.35 wt% Mo and the balance being Fe and unavoidable impurities.

Contain in the steel raw material that following embodiment 4 and embodiment 5 use: the C of 0.29% by weight, the Si of 0.29% by weight, the Mn of 0.41% by weight, the S of 0.003% by weight, the P of 0.010% by weight, the Cr of 2.11% by weight , 2.87% by weight of Ni, 0.33% by weight of Mo, and the balance being Fe and unavoidable impurities.

Preparation example: preparation of steel ingot

1) Eccentric bottom electric arc furnace melting:

Put 40 tons of steel raw materials into the eccentric bottom electric arc furnace, use arc heating, control the oxidation temperature not lower than 1560 ℃, make the steel raw materials melt into molten steel, and quickly reach the tapping temperature, and then carry out dephosphorization and decarburization treatment in sequence, control The decarburization amount of molten steel is not less than 0.30% by weight, and the end point of dephosphorization and decarburization satisfies that the carbon content of molten steel is 0.06-0.2% by weight, the phosphorus content is not higher than 0.01% by weight, and the tapping temperature is not lower than 1600 ℃.

2) Refining outside the furnace:

Remove the slag on the surface of the primary molten steel that is obtained in step 1), pour the primary molten steel into the ladle furnace, adopt electric arc heating, supplement the temperature drop of the molten steel entering the ladle furnace from the eccentric bottom electric arc furnace, and make the primary molten steel The temperature is not lower than 1510°C. Inert gas is introduced into the ladle furnace to deoxidize, desulfurize and remove impurities from the molten steel, and to stir, heat and slag the molten steel to create a reducing atmosphere and high-alkalinity slag. When the slag on the upper surface of the molten steel turns white, it proves that the molten steel has been completely reduced. The temperature of the molten steel in the ladle furnace is controlled to not be lower than 1550°C, so that the white slag remains for not less than 10 minutes, and the molten steel is sampled and analyzed. The sulfur content in the molten steel is controlled to be no higher than 0.005% by weight, the oxygen content is not higher than 0.001% by weight, the molten steel is continuously heated, and the temperature in the ladle furnace is controlled to be no lower than 1620°C. Then add silica into the ladle furnace at a feeding rate of 50kg/furnace, and control the ladle furnace to continue heating the molten steel until the silica is completely melted. When the temperature in the ladle furnace is not lower than 1570°C, add For the aluminum wire, the aluminum content in the molten steel is controlled within the range of 0.03-0.06% by weight, and the composition of the slag is adjusted to further increase the desulfurization rate by 1.5-2 times. The heat loss of molten steel in the ladle furnace caused by the addition and melting of various components in the above-mentioned refining process, the heat taken away by bottom blowing argon and vacuum pumping, etc., so it is necessary to continuously heat the molten steel. The temperature of the molten steel is raised to not less than 1600°C, and ferrochromium is added to the molten steel to adjust the composition of the molten steel. The molten steel whose composition has been adjusted by the ferrochrome alloy is transferred to the VD furnace for vacuum degassing treatment. When the molten steel enters the VD furnace, the thickness of the slag is required to be no higher than 60mm, and the molten steel is fed with calcium silicon wire (Ca-Si wire) after entering the VD furnace. , transform the high melting point Al ₂ O ₃ inclusions produced by aluminum deoxidation into low melting point and low density calcium aluminate inclusions (such as 12CaO·7Al ₂ O ₃ ), reduce the number of sulfide inclusions, change their composition and properties, and purify For the molten steel, the ultimate vacuum degree is controlled to be no higher than 100 Pa, and the holding time under the ultimate vacuum is not less than 10 minutes to obtain refined molten steel.

3) Casting ingots:

The refined molten steel obtained in step 2) is casted by mold casting and pouring method, the casting temperature is 1530-1570°C, the casting time of the ingot is 450-750 seconds, and the casting time of the riser is 200-500 seconds. After the steel ingot is demoulded, the obtained Steel ingots were used for the press forging process in the subsequent examples.

The specification of the obtained steel ingot is 8 tons of octagonal ingot, and Cu≤0.10% by weight, S≤0.008% by weight, P≤0.010% by weight, [H]≤2.5ppm, [O]≤15ppm in the obtained steel ingot, wherein, the steel ingot Each element in is tested according to the method specified in the standard number GB/T 20066-2006.

Embodiment 1: Preparation of a homogeneous target plate with a thickness of 150mm

1) Press forging: heat the ingot from Preparation Example 1 at 580±10°C for 2h; then raise the temperature to 760±10°C at a heating rate of 70°C/h, and keep it at this temperature for 2h; then heat it at 90°C The heating rate of ℃/h is raised to 1190±10℃, and kept at this temperature for 4h; then adopt the 2-pier 2-drawing process, make the jaws, the thick height of the pier is 1/2H, and use the FM method for drawing length, and first transverse forge When the width is required, it is then elongated longitudinally, so that the thickness of the obtained target plate is 175mm. During the forging process, when the temperature of the steel ingot is lower than 850°C, the steel ingot is reburned at 1190±10°C, and the reburning time is 70min;

2) Annealing treatment: heat the target plate with a temperature of 600°C obtained in step 1) to 700±10°C at a heating rate of 70°C/h, and keep it at this temperature for 3 hours; then heat it at a heating rate of 95°C/h Raise the temperature to 870±10°C and keep it at this temperature for 5 hours; then air cool the obtained target plate to 370±10°C and keep it at this temperature for 6 hours; then raise the temperature of the target plate to 680±10°C and keep it at this temperature Keep it at the lower temperature for 30h; then cool down to 400°C at a cooling rate of 28°C/h, and then cool down to 120°C at a cooling rate of 12°C/h;

3) Mechanical processing: milling on all four sides of the target board after sawing the head and tail;

4) Quenching and tempering treatment: first keep the target plate after mechanical processing at 320°C for 1h; then raise the temperature to 680±10°C at a heating rate of 70°C/h, and keep it at this temperature for 1h; then use 90°C The heating rate of ℃/h is raised to 890±10℃, and kept at this temperature for 550min; then the target plate is air-cooled for 45s and then kept in the quenching liquid for 60min, so that the target plate is treated in the quenching liquid to a temperature of 210 Take out the quenching liquid at ±10°C, and then air cool to 80°C; then heat the target plate at a heating rate of 70°C/h to 650±10°C for tempering treatment, and keep it at this temperature for 670min; then Water-cool the target plate to 100°C to obtain the finished target plate B1.

According to the method specified in GB/T4162-2008 Class A, conduct ultrasonic flaw detection on the finished target plate B1 to ensure that the homogeneous target plate has no defects such as cracks, scratches, pores in the weld, slag inclusions, and incomplete penetration. internal quality.

Embodiment 2: preparation thickness is the homogeneous target plate of 220mm

This example is carried out using a method similar to Example 1, the difference is that the conditions of press forging are controlled during the press forging process, so that the thickness of the obtained target plate is 245mm, and the modulation processing steps of this example for:

First keep the machined target plate at 320°C for 1h; then raise the temperature to 680±10°C at a rate of 70°C/h, and keep it at this temperature for 1.2h; then increase the temperature at 90°C/h The temperature was raised to 890±10°C and kept at this temperature for 620 minutes; then the target plate was air-cooled for 50s and then kept in the quenching liquid for 65 minutes, so that the target plate was treated in the quenching liquid until the temperature was 210±10°C. The quenching liquid is then air-cooled to 80°C; then the target plate is first heated to 650±10°C at a heating rate of 70°C/h for tempering treatment, and kept at this temperature for 720min; then the target plate is water-cooled to 100°C to obtain the finished target plate B2.

According to the method specified in GB/T4162-2008 Class A, conduct ultrasonic flaw detection on the finished target plate B2 to ensure that the homogeneous target plate has no defects such as cracks, scratches, pores in the weld, slag inclusions, and incomplete penetration. internal quality.

Embodiment 3: preparation thickness is the homogeneous target plate of 300mm

This example is carried out using a method similar to Example 1, the difference is that the conditions of press forging are controlled during the press forging process, so that the thickness of the obtained target plate is 325mm, and the modulation processing steps of this example for:

First keep the machined target plate at 350°C for 1h; then raise the temperature to 680±10°C at a rate of 80°C/h, and keep it at this temperature for 1.5h; then increase the temperature at 100°C/h The temperature was raised to 890±10°C and kept at this temperature for 760 minutes; then the target plate was air-cooled for 60s and then kept in the quenching liquid for 80 minutes, so that the target plate was treated in the quenching liquid until the temperature was 210±10°C. The quenching liquid is then air-cooled to 100°C; then the target plate is first heated to 650±10°C at a heating rate of 80°C/h for tempering treatment, and kept at this temperature for 880min; then the target plate is water-cooled to 100°C to obtain the finished target plate B3.

According to the method specified in GB/T4162-2008 Class A, conduct ultrasonic flaw detection on the finished target plate B3 to ensure that the homogeneous target plate has no defects such as cracks, scratches, pores in the weld, slag inclusions, and incomplete penetration. internal quality.

Embodiment 4: preparation thickness is the homogeneous target plate of 360mm

This example is carried out using a method similar to Example 1, the difference is that the conditions of press forging are controlled during the press forging process, so that the thickness of the obtained target plate is 380mm, and the modulation processing steps of this example for:

First keep the machined target plate at 340°C for 1h; then raise the temperature to 680±10°C at a heating rate of 75°C/h, and keep at this temperature for 1.5h; then increase the temperature at 95°C/h The temperature was raised to 890±10°C and kept at this temperature for 880 minutes; then the target plate was air-cooled for 60s and then kept in the quenching liquid for 120 minutes, so that the target plate was treated in the quenching liquid until the temperature was 210±10°C. The quenching liquid is then air-cooled to 80°C; then the target plate is first heated to 650±10°C at a heating rate of 80°C/h for tempering treatment, and kept at this temperature for 950min; then the target plate is water-cooled to 100°C to obtain the finished target plate B4.

According to the method specified in GB/T4162-2008 Class A, conduct ultrasonic flaw detection on the finished target plate B4 to ensure that the homogeneous target plate has no defects such as cracks, scratches, pores in the weld, slag inclusions, and incomplete penetration. internal quality.

Embodiment 5: preparation thickness is the homogeneous target plate of 400mm

This example is carried out using a method similar to Example 1, the difference is that the conditions of press forging are controlled during the press forging process, so that the thickness of the obtained target plate is 425mm, and the modulation processing steps of this example for:

First keep the machined target plate at 320°C for 1h; then raise the temperature to 680±10°C at a rate of 80°C/h, and keep it at this temperature for 1.8h; then increase the temperature at 100°C/h The temperature was raised to 890±10°C and kept at this temperature for 900 minutes; then the target plate was air-cooled for 60s and then kept in the quenching liquid for 130 minutes, so that the target plate was treated in the quenching liquid until the temperature was 210±10°C. The quenching liquid is then air-cooled to 100°C; then the target plate is first heated to 650±10°C at a heating rate of 70°C/h for tempering treatment, and kept at this temperature for 1000min; then the target plate is water-cooled to 100°C to obtain the finished target plate B5.

According to the method specified in GB/T4162-2008 Class A, conduct ultrasonic flaw detection on the finished target plate B5 to ensure that the homogeneous target plate has no defects such as cracks, scratches, pores in the weld, slag inclusions, and incomplete penetration, and has good internal quality.

Comparative example 1

This comparative example adopts the method similar to embodiment 1 to carry out, difference is:

This comparative example does not carry out the press forging of step 1), but adopts die-casting steel ingot to increase the thickness of 8 tons of octagonal ingots that preparation example obtains with large-scale hot-rolled plate rolling mill, makes the thickness of gained target plate be 150mm, And in step 4) of the present embodiment, during the preparation process, the quenching liquid used is water. All the other are the same as in Example 1. The finished target board DB1 was obtained.

According to the method specified in GB/T4162-2008 Class A, the finished target plate DB1 is subjected to ultrasonic flaw detection. The finished target plate DB1 has defects such as small cracks, pores, serious looseness in the center, coarse grains, uneven structure, etc. The quality is poor. Did not meet GB/T4162-2008A level requirements.

Comparative example 2

This comparative example adopts the method similar to embodiment 1 to carry out, difference is:

This comparative example does not carry out the press forging of step 1), but adopts die casting steel ingot to increase the thickness of 8 tons of octagonal ingots that preparation example obtains by large-scale hot-rolled plate rolling mill, makes the thickness of gained target plate be 150mm, And in step 4) of this embodiment, during the preparation process, the quenching liquid used is 0 ^# diesel oil. All the other are the same as in Example 1. The finished target board DB2 was obtained.

According to the method specified in GB/T4162-2008 Class A, the finished target plate DB2 is ultrasonically inspected. The finished target plate DB1 has defects such as small cracks, pores, serious looseness in the center, coarse grains, uneven structure, etc. The quality is poor. Cannot meet the requirements of GB/T4162-2008A level.

test case

The properties of the finished target plates prepared in the above examples and comparative examples were tested respectively, and the test results are listed in Table 1 respectively. Among them, the indentation diameter is tested by the method specified in the standard number GB/T231.2-2012; the tensile strength, yield strength, elongation and reduction of area are all tested by the standard number specified in GB/T228.1-2010 The test method is used for testing; the impact absorption energy is tested by the method specified in the standard number GB/T229-2007; the fracture fiber structure level is tested by the method specified in the standard number GB/T1814-1979.

Table 1

It can be seen from the above results that the manufacturing method of the tempered and homogeneous target plate provided by the present invention can obtain a tempered and homogeneous target plate with uniform planar structure, uniform hardness and small performance anisotropy.

The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention. These simple modifications All belong to the protection scope of the present invention.

In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way if there is no contradiction. The combination method will not be described separately.

In addition, various combinations of different embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Claims (12)

1. a kind of manufacturing method of quenched homogeneous target, this method include that steel ingot is successively carried out press forging, annealing, machine Tool working process and modifier treatment, wherein the annealing uses and comprises the following processes the step of progress:

(1) target plate obtained after press forging is warming up to 650~750 DEG C of the first temperature with the first heating rate of≤80 DEG C/h Degree, and this first at a temperature of keep 2~4h；

(2) target plate after step (1) is warming up to 820~920 DEG C of the second temperature with the second heating rate of≤100 DEG C/h Degree, and 4~6h is kept under the second temperature；

(3) temperature of the target plate after step (2) is down to 350~400 DEG C of third temperature, and is kept at a temperature of the third 5~7h；

(4) target plate after step (3) is warming up to 630~730 DEG C of the 4th temperature, and at a temperature of the 4th keep 25~ 35h；And

(5) target plate after step (4) is cooled to 350~450 DEG C with the first rate of temperature fall of≤30 DEG C/h, then to be lower than Second rate of temperature fall of first rate of temperature fall be cooled to 200 DEG C hereinafter,

Wherein, the steel ingot is made and steel raw material is successively carried out eccentric-bottom arc melting, external refining and casting, institute It states steel raw material successively to carry out containing in the refining liquid steel obtained after eccentric-bottom arc melting and external refining: 0.27~0.33 weight Measure the C, the Si of 0.18~0.35 weight %, the Mn of 0.30~0.50 weight %, the S of 0~0.030 weight %, 0~0.030 of % The P of weight %, the Cr of 1.80~2.30 weight %, the Ni of 1.80~3.00 weight %, the Mo of 0.28~0.38 weight % are remaining Amount is Fe and inevitable impurity.

2. the manufacturing method according to claim 1, wherein first temperature is 680~720 DEG C.

3. the manufacturing method according to claim 1, wherein the second temperature is 850~890 DEG C.

4. the manufacturing method according to claim 1, wherein the 4th temperature is 660~700 DEG C.

5. manufacturing method described in any one of -4 according to claim 1, wherein second rate of temperature fall be≤15 DEG C/ h。

6. manufacturing method described in any one of -4 according to claim 1, wherein the press forging step includes: by steel Ingot carries out pier at least twice and pulls out operation, and then laterally forging longitudinally pulls out again to width requirement, and upset so that steel ingot height For 1/4H~3/4H.

7. manufacturing method according to claim 6, wherein in the press forging step, before carrying out pier and pulling out operation The steel ingot is heated using the step of comprising the following processes first: keeping 1~3h at a temperature of the 5th of≤600 DEG C；So 710~810 DEG C of the 6th temperature is warming up to the heating rate of≤80 DEG C/h afterwards, and keeps 1~3h at a temperature of the 6th；It connects 1100~1200 DEG C of the 7th temperature is warming up to the heating rate of≤100 DEG C/h, and keep at a temperature of the 7th 3~ 5h。

8. manufacturing method described in any one of -4 and 7 according to claim 1, wherein it includes such as that the modifier treatment, which uses, The step of lower process, carries out:

A) treated that target plate keeps 0.2~2h at≤350 DEG C by machined；

B) target plate after step a) is warming up to 630~730 DEG C of the 8th temperature with the heating rate of≤80 DEG C/h, and at this 0.2~2.5h is kept at a temperature of 8th；

C) target plate after step b) is warming up to 840~940 DEG C of the 9th temperature with the heating rate of≤100 DEG C/h, and 400~1000min is kept at a temperature of 9th；

D) 40~200min of holding in quenching liquid will then be reentered through the first air-cooled 30~90s of the target plate after step c)；

E) target plate after step d) is first warming up to the heating rate of≤80 DEG C/h at a temperature of the tenth of 600~700 DEG C into Row tempering, and 300~1500min is kept at a temperature of the tenth.

9. manufacturing method according to claim 8, wherein in step d), the target plate is handled in quenching liquid to temperature The quenching liquid out when degree is 180~240 DEG C.

10. manufacturing method according to claim 9, wherein, first will be through before carrying out tempering in step e) Target plate after step d) is cooled to≤100 DEG C and carries out the tempering again.

11. the manufacturing method according to claim 1, wherein the condition that the steel ingot is made makes in the steel ingot The weight of Cu≤0.10 weight of %, S≤0.008 %, P≤0.010 weight %, [H]≤2.5ppm, [O]≤15ppm.

12. the manufacturing method according to claim 1, wherein the machining processes make gained target plate with a thickness of 150~450nm.