CN110669918A - Heat treatment quenching process for high-toughness steel strip - Google Patents
Heat treatment quenching process for high-toughness steel strip Download PDFInfo
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- CN110669918A CN110669918A CN201910981657.3A CN201910981657A CN110669918A CN 110669918 A CN110669918 A CN 110669918A CN 201910981657 A CN201910981657 A CN 201910981657A CN 110669918 A CN110669918 A CN 110669918A
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- tempering
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 102
- 239000010959 steel Substances 0.000 title claims abstract description 102
- 238000010438 heat treatment Methods 0.000 title claims abstract description 44
- 238000010791 quenching Methods 0.000 title claims abstract description 39
- 230000000171 quenching effect Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005496 tempering Methods 0.000 claims abstract description 40
- 238000005246 galvanizing Methods 0.000 claims abstract description 13
- 238000005498 polishing Methods 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 238000005520 cutting process Methods 0.000 claims abstract description 9
- 239000000243 solution Substances 0.000 claims description 20
- 238000004140 cleaning Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 8
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 6
- 235000019270 ammonium chloride Nutrition 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 239000003595 mist Substances 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000011592 zinc chloride Substances 0.000 claims description 4
- 235000005074 zinc chloride Nutrition 0.000 claims description 4
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000003139 buffering effect Effects 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 3
- 238000007670 refining Methods 0.000 abstract description 3
- 238000002161 passivation Methods 0.000 description 9
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- 238000007761 roller coating Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000011365 complex material Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating With Molten Metal (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention provides a heat treatment quenching process for a high-toughness steel strip, which comprises preheating treatment, quenching treatment, tempering treatment, polishing treatment, surface galvanizing, cutting and warehousing. The invention provides a high-toughness steel strip heat treatment quenching process, which comprises the steps of carrying out primary heating, normalizing and high-temperature tempering treatment before quenching, wherein the primary heating is used for buffering sudden high temperature of the steel strip, the normalizing treatment is used for refining steel strip grains and homogenizing carbide distribution, and is used for improving the toughness of the steel strip and reducing the hardness of the steel strip; the high-temperature tempering is to eliminate the stress generated during normalizing and cooling and further increase the toughness of the steel strip; the surface of the steel strip is galvanized, so that the corrosion resistance and the service life of the steel strip are improved.
Description
Technical Field
The invention mainly relates to the technical field of steel processing, in particular to a heat treatment quenching process for a high-toughness steel strip.
Background
The metal is oxidized and decarburized when being heated in the air, so that the metal burning loss is caused, the mechanical property is reduced, the service life is reduced, the processing procedures are increased, and the production cost is increased. When we heat treat metal materials such as steel strip and steel, a plurality of complex materials are generated in a furnaceGases which react with the strip, e.g. oxygen (O)2) Nitrogen (N)2) Carbon dioxide (CO)2) Hydrogen (H)2) Water vapor (H)2O), methane (CH)4) And evaporated oil gas, etc., which can generate iron substance (Fe), iron carbide (FeC) and water (H) on the surface of the steel strip2O) and other contaminants. Oxidation of the metal not only causes loss of the strip, which damages the surface of the strip and prevents further processing and use, but also requires pickling of the strip after heat treatment. The pickling, that is, removing the oxide on the surface of the steel strip by using an acid solution, is costly, and the acid solution reacts with not only the oxide on the surface but also the metal of the steel strip, thereby increasing the consumption of the metal. In addition, the existing steel strip is generally processed by quenching and tempering, so that the flexibility, the corrosion resistance and the service life of the manufactured steel strip are not high.
Disclosure of Invention
Technical problem to be solved by the invention
The invention provides a heat treatment quenching process for a high-toughness steel strip, which is used for solving the technical problems that the surface treatment needs to be carried out on the steel strip after the heat treatment, the working procedures and the cost are increased, and the flexibility, the corrosion resistance and the service life of the existing steel strip are not high.
Technical scheme
The technical scheme adopted by the invention for solving the technical problems is as follows: a heat treatment quenching process for a high-toughness steel strip comprises the following steps:
a. preheating; cleaning the surface of the conveyed steel strip, and conveying the steel strip into a preheating device for primary heating;
b. carrying out quenching preliminary heat treatment; sending the steel strip subjected to preheating treatment into a heating furnace for bright heat treatment, and firstly normalizing treatment and then high-temperature tempering treatment;
c. quenching treatment; putting the steel strip obtained in the last step into a quenching device;
d. tempering; putting the steel strip into a tempering furnace for secondary tempering treatment;
e. polishing; polishing the cooled steel belt to achieve bright and clean surface;
f. galvanizing the surface; putting the steel strip obtained in the last step into a cleaning solution for cleaning, and then sending the steel strip into a hot-dip galvanizing bath for galvanizing;
g. cutting and warehousing; and cutting the steel strip according to the specification, and coiling and warehousing.
Further, the temperature of the preliminary heating in the step a is between 50 ℃ and 100 ℃.
Further, in the step b, the temperature of the normalizing treatment is between 700 ℃ and 950 ℃, and the temperature of the high-temperature tempering treatment is controlled between 550 ℃ and 650 ℃.
Further, in the step b, the normalizing treatment is heating by adopting a vacuum hood furnace, and cooling is carried out by utilizing a high-pressure spray nozzle to spray water mist after the normalizing treatment is finished; and during the high-temperature tempering, protective gas is introduced into the tempering furnace.
Further, the steel strip is subjected to graded quenching in an alkali bath at 160 ℃ in the step c.
Further, the tempering temperature in the step d is controlled between 350 ℃ and 500 ℃, and the temperature is kept for 2-4 hours, wherein the steel strip is immersed in oil or water for cooling.
Further, the cleaning solution used in step f may be any one of the following solutions: ammonium chloride solution, zinc chloride aqueous solution, and mixed aqueous solution of ammonium chloride and zinc chloride.
Further, the following processes are also required in the step f and the step g, and the specific steps are as follows:
f1. passivating; chromate passivation is mainly used. Activating agent, such as fluoride, phosphoric acid or sulfuric acid, is added into the passivation solution, so that a thicker chromate film is obtained after passivation. When the passivating solution contains fluoride, the surface tension of the steel strip can be reduced, the film forming reaction is accelerated, and the chemical polishing effect can be increased, so that the passivating film is fine and bright;
f2. pre-phosphorization; uniformly coating the phosphating solution on the surface of the steel strip by using a roller coating process, and drying by hot air;
f3. oiling; and (4) uniformly coating the surface of the steel belt with antirust oil.
Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the beneficial effects that:
the invention provides a high-toughness steel strip heat treatment quenching process, which comprises the steps of carrying out primary heating, normalizing and high-temperature tempering treatment before quenching, wherein the primary heating is used for buffering sudden high temperature of the steel strip, the normalizing treatment is used for refining steel strip grains and homogenizing carbide distribution, and is used for improving the toughness of the steel strip and reducing the hardness of the steel strip; the high-temperature tempering is to eliminate the stress generated during normalizing and cooling and further increase the toughness of the steel strip; the surface of the steel strip is galvanized, so that the corrosion resistance and the service life of the steel strip are improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The specification and examples are exemplary only.
Example 1
A heat treatment quenching process for a high-toughness steel strip comprises the following steps:
a. preheating; cleaning the surface of the conveyed steel strip, and conveying the steel strip into a preheating device for primary heating, wherein the temperature of the primary heating is set to be 70 ℃;
b. carrying out quenching preliminary heat treatment; sending the steel strip subjected to preheating treatment into a heating furnace for bright heat treatment, and firstly normalizing treatment and then high-temperature tempering treatment, wherein the temperature of the normalizing treatment is 800 ℃, the temperature of the high-temperature tempering treatment is controlled at 590 ℃, the normalizing treatment is heating by adopting a vacuum cover furnace, and after the normalizing treatment is finished, a high-pressure spray nozzle is used for spraying water mist for cooling; during the high-temperature tempering, protective gas is introduced into the tempering furnace;
c. quenching treatment; putting the steel strip obtained in the last step into a quenching device, and carrying out graded quenching in an alkaline bath at 160 ℃;
d. tempering; putting the steel strip into a tempering furnace for secondary tempering treatment, controlling the tempering temperature at 390 ℃, and preserving heat for 3 hours, wherein the steel strip is immersed into oil or water for cooling;
e. polishing; polishing the cooled steel belt to achieve bright and clean surface;
f. galvanizing the surface; putting the steel strip obtained in the last step into a cleaning solution for cleaning, and then sending the steel strip into a hot-dip galvanizing bath for galvanizing;
f1. passivating; chromate passivation is mainly used. Activating agent, such as fluoride, phosphoric acid or sulfuric acid, is added into the passivation solution, so that a thicker chromate film is obtained after passivation. When the passivating solution contains fluoride, the surface tension of the steel strip can be reduced, the film forming reaction is accelerated, and the chemical polishing effect can be increased, so that the passivating film is fine and bright;
f2. pre-phosphorization; uniformly coating the phosphating solution on the surface of the steel strip by using a roller coating process, and drying by hot air;
f3. oiling; uniformly coating antirust oil on the surface of the steel belt;
g. cutting and warehousing; and cutting the steel strip according to the specification, and coiling and warehousing.
Example 2
A heat treatment quenching process for a high-toughness steel strip comprises the following steps:
a. preheating; cleaning the surface of the conveyed steel strip, and conveying the steel strip into a preheating device for primary heating, wherein the temperature of the primary heating is set to be 90 ℃;
b. carrying out quenching preliminary heat treatment; sending the steel strip subjected to preheating treatment into a heating furnace for bright heat treatment, and firstly normalizing treatment and then high-temperature tempering treatment, wherein the temperature of the normalizing treatment is 900 ℃, the temperature of the high-temperature tempering treatment is controlled to be 630 ℃, the normalizing treatment is heating by adopting a vacuum cover furnace, and after the normalizing treatment is finished, a high-pressure spray nozzle is used for spraying water mist for cooling; during the high-temperature tempering, protective gas is introduced into the tempering furnace;
c. quenching treatment; putting the steel strip obtained in the last step into a quenching device, and carrying out graded quenching in an alkaline bath at 160 ℃;
d. tempering; putting the steel strip into a tempering furnace for secondary tempering treatment, controlling the tempering temperature to be 480 ℃, and preserving heat for 3 hours, wherein the steel strip is immersed into oil or water for cooling;
e. polishing; polishing the cooled steel belt to achieve bright and clean surface;
f. galvanizing the surface; putting the steel strip obtained in the last step into a cleaning solution for cleaning, and then sending the steel strip into a hot-dip galvanizing bath for galvanizing;
f1. passivating; chromate passivation is mainly used. Activating agent, such as fluoride, phosphoric acid or sulfuric acid, is added into the passivation solution, so that a thicker chromate film is obtained after passivation. When the passivating solution contains fluoride, the surface tension of the steel strip can be reduced, the film forming reaction is accelerated, and the chemical polishing effect can be increased, so that the passivating film is fine and bright;
f2. pre-phosphorization; uniformly coating the phosphating solution on the surface of the steel strip by using a roller coating process, and drying by hot air;
f3. oiling; uniformly coating antirust oil on the surface of the steel belt;
g. cutting and warehousing; and cutting the steel strip according to the specification, and coiling and warehousing.
In conclusion, the heat treatment quenching process for the high-toughness steel strip, provided by the invention, comprises the steps of carrying out primary heating, normalizing and high-temperature tempering treatment before quenching, wherein the primary heating is used for buffering sudden high temperature of the steel strip, the normalizing treatment is used for refining steel strip grains and homogenizing carbide distribution, the toughness of the steel strip is improved, the hardness of the steel strip is reduced, and the operation in a vacuum hood furnace is used for protecting the surface of the steel strip during the normalizing treatment, so that the surface quality of the steel strip is improved, the pickling process is reduced, and the cost is reduced; the high-temperature tempering is to eliminate the stress generated during normalizing and cooling and further increase the toughness of the steel strip; the surface of the steel strip is galvanized, so that the corrosion resistance and the service life of the steel strip are improved.
The foregoing is merely an illustrative embodiment of the present invention, and any equivalent changes and modifications made by those skilled in the art without departing from the spirit and principle of the present invention should fall within the protection scope of the present invention.
Claims (7)
1. A heat treatment quenching process for a high-toughness steel strip is characterized by comprising the following steps:
a. preheating; cleaning the surface of the conveyed steel strip, and conveying the steel strip into a preheating device for primary heating;
b. carrying out quenching preliminary heat treatment; sending the steel strip subjected to preheating treatment into a heating furnace for bright heat treatment, and firstly normalizing treatment and then high-temperature tempering treatment;
c. quenching treatment; putting the steel strip obtained in the last step into a quenching device
d. Tempering; putting the steel strip into a tempering furnace for secondary tempering treatment;
e. polishing; polishing the cooled steel belt to achieve bright and clean surface;
f. galvanizing the surface; putting the steel strip obtained in the last step into a cleaning solution for cleaning, and then sending the steel strip into a hot-dip galvanizing bath for galvanizing;
g. cutting and warehousing; and cutting the steel strip according to the specification, and coiling and warehousing.
2. The process of heat treating and quenching a high toughness steel strip as claimed in claim 1, wherein: the temperature of the primary heating in the step a is between 50 ℃ and 100 ℃.
3. The process of heat treating and quenching a high toughness steel strip as claimed in claim 1, wherein: in the step b, the temperature of the normalizing treatment is between 700 and 950 ℃, and the temperature of the high-temperature tempering treatment is controlled between 550 and 650 ℃.
4. The process of heat treating and quenching a high toughness steel strip as claimed in claim 1, wherein: in the step b, the normalizing treatment is heating by adopting a vacuum hood furnace, and cooling by utilizing a high-pressure spray nozzle to spray water mist after the normalizing treatment is finished; and during the high-temperature tempering, protective gas is introduced into the tempering furnace.
5. The process of heat treating and quenching a high toughness steel strip as claimed in claim 1, wherein: and c, carrying out graded quenching on the steel strip in an alkaline bath at 160 ℃.
6. The process of heat treating and quenching a high toughness steel strip as claimed in claim 1, wherein: and d, controlling the tempering temperature in the step d to be 350-500 ℃, and preserving the heat for 2-4 hours, wherein the steel strip is immersed in oil or immersed in water for cooling.
7. The process of heat treating and quenching a high toughness steel strip as claimed in claim 1, wherein: the washing solution used in step f may be any one of the following: ammonium chloride solution, zinc chloride aqueous solution, and mixed aqueous solution of ammonium chloride and zinc chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910981657.3A CN110669918A (en) | 2019-10-16 | 2019-10-16 | Heat treatment quenching process for high-toughness steel strip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910981657.3A CN110669918A (en) | 2019-10-16 | 2019-10-16 | Heat treatment quenching process for high-toughness steel strip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455142A (en) * | 2020-03-30 | 2020-07-28 | 常熟市精灵标准件有限公司 | Heat treatment method of self-locking nut |
| CN112626317A (en) * | 2020-12-17 | 2021-04-09 | 建湖县永维阀门钻件有限公司 | Processing technology of threaded joint of marine drilling riser |
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| JPH04110422A (en) * | 1990-08-29 | 1992-04-10 | Kobe Steel Ltd | Production of 70kgf/mm2 class steel plate having superior weldability and low yield ratio |
| CN1196397A (en) * | 1998-02-25 | 1998-10-21 | 谢燕飞 | Low carbon high-strength toughness steel band and manufacturing technology thereof |
| KR20020022191A (en) * | 2000-09-19 | 2002-03-27 | 이구택 | Method for manufacturing sleeve for hot strip mill with excellent fatigue resistance |
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| CN112626317A (en) * | 2020-12-17 | 2021-04-09 | 建湖县永维阀门钻件有限公司 | Processing technology of threaded joint of marine drilling riser |
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