CN103614630A - Steel for high-strength bridge and manufacturing method of steel - Google Patents
Steel for high-strength bridge and manufacturing method of steel Download PDFInfo
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Abstract
The invention relates to steel for a high-property structure, and a manufacturing method of the steel, and in particular relates to steel for a high-strength bridge, and the manufacturing method of the steel, belonging to the technical field of metallurgy. The steel for the high-strength bridge comprises the following components in percentage by weight: 0.05-0.09% of C, 0.25-0.50% of Si, 1.30-1.60% of Mn, less than or equal to 0.010% of P, less than or equal to 0.0020% of S, 0.30-0.55% of Cu, 0.20-0.80% of Ni, 0.025-0.060% of Nb, 0.02-0.06% of V, 0.020-0.050% of Alt and the balance of Fe and inevitable impurities. The steel has the beneficial effects that the toughness property of the low-alloy steel is enhanced through reasonable low-carbon component design and low-phosphorous low-sulfur smelting processes with the combination of other trace alloying elements.
Description
Technical field
The present invention relates to steel and preparation method thereof for a kind of high performance structures, especially a kind of high-strength bridge steel plate and preparation method thereof, belongs to metallurgical technology field.
Background technology
Bridges in Our Country construction is to high speed, heavy duty, large span, entirely weld node, safe future development.The Bridge Steel yield strength scope of using is at present generally 245～420MPa, has also developed and used high performance bridge steel kind abroad.As the U.S. adopts high performance bridge steel, many HPSs have been built.But this type of steel generally adopts quenched and tempered state delivery, and impelling strength is on the low side.Some Domestic steel enterprise is developing high performance bridge steel kind, but trial product still has some deficits in aspect levels such as yield tensile ratio, low-temperature flexibilities at present.The existing technology of using steel making method about bridge construction, mainly to obtain bridge construction steel plate by methods such as controlled rolling and controlled coolings, as Chinese patent CN101892431 discloses hot rolled weatherproof bridge steel with yield strength of 500 MPa level and manufacture method thereof, technical process is molten iron pre-desulfurization → converter smelting → RH vacuum-treat → casting, produces high-strength weathering bridge construction steel.Because this steel grade condition of delivery is As rolled, steel plate internal stress is not eliminated, and in downstream user use procedure, has the problems such as yielding, and-40 ℃ of low-temperature flexibilities are general, is unsuitable for the developing direction of steel for high-strength and high ductility bridge construction.
Summary of the invention
The technical problem to be solved in the present invention is the defect existing for prior art, proposes a kind of high-strength bridge steel plate and preparation method thereof, meet large-scale steel structure bridge to high speed, heavy duty, large span, entirely weld the development of node, safe direction.
The present invention is technical solution problem by the following technical programs, and a kind of high-strength bridge steel plate, comprises following component: C:0.05～0.09% by weight percentage, Si:0.25～0.50%, Mn:1.30～1.60%, P :≤0.010%, S :≤0.0020%, Cu:0.30～0.55%, Ni:0.20～0.80%, Nb:0.025～0.060%, V:0.02～0.06%, Alt:0.020～0.050%, all the other are Fe and inevitable impurity.
The present invention comparatively preferably comprises following component: C:0.070%, Si:0.35%, Mn:1.35%, P:0.0077% by weight percentage, S:0.0011%, Cu:0.32%, Ni:0.40%, Nb:0.033%, V:0.025%, Alt:0.026%, all the other are Fe and inevitable impurity.
In steel, impurity element is as S, P etc., can grievous injury described in the low-temperature flexibility of steel and the nearly weld metal zone of welding, increase continuous casting slab segregation degree.Sulphur, phosphorus content should be controlled at S≤0.0020% and P≤0.010%.Other inevitable impurity element, control is respectively: O≤0.0015%, N≤0.0080%, H≤0.0003%, As≤0.010%, Pb≤0.010%, Sn≤0.010%, Sb≤0.010%.
Chemical composition is one of key factor affecting continuously cast bloom internal soundness and High Strength Steel Plate performance, and the present invention, in order to make described steel obtain excellent over-all properties, limits the chemical composition of described steel, and reason is:
C: carbon is the one of the chief elements that affects high-strength steel mechanical property, by the intensity of gap solid solution raising steel, when carbon content is less than 0.04, intensity is low; During too high levels, toughness and weldability are by variation, and carbon content control of the present invention is 0.05～0.09%.
Si: silicon is the deoxidant element that steel-making is necessary, has certain solution strengthening effect; Silicone content is too high, is unfavorable for plate surface quality and low-temperature flexibility, and silicone content of the present invention is controlled at 0.25～0.50%.
Mn: the effect that manganese has thinning microstructure, improves intensity and low-temperature flexibility, and also with low cost.During manganese too high levels, easily cause continuous casting slab segregation.Manganese content of the present invention is controlled at 1.30～1.60%.
Ni: nickel can improve intensity, toughness and the corrosion resistance nature of steel, suppresses carbon precipitation from austenite, reduces grain boundary carbide and separates out tendency, significantly reduces intergranular carbide quantity.But along with nickel content increases, production cost can significantly increase, and nickel content of the present invention is controlled at 0.20～0.80%.
Cu: copper can suppress polygonal ferrite and pearlitic formation, promotes low temperature to organize bainite or martensitic transformation.Copper too high levels affects the toughness of steel, and causes temper brittleness, and in the present invention, copper content control is 0.30～0.55%.
Nb: trace niobium has pinning effect to austenite grain boundary, suppresses the austenitic recrystallize of deformation, and when cooling or tempering, forms precipitate, improves intensity and toughness.DeGrain when niobium addition level is less than 0.025%, toughness drop while being greater than 0.060%, and cause that continuously cast bloom surface crack produces, and also has deterioration effect to welding property in addition.Content of niobium of the present invention is controlled at 0.025～0.060%.
V: vanadium is the good reductor of steel.In steel, add the vanadium can thinning microstructure crystal grain, improve intensity and toughness.During tempering or when cooling after welding, form carbide, be conducive to gain in strength.DeGrain when addition is less than 0.02%, while being greater than 0.06%, the toughness of steel and weldability reduce.Therefore, content of vanadium should be controlled in 0.02～0.06% scope.
Al: aluminium is a kind of important deoxidant element, adds micro-aluminium in molten steel, can effectively reduce the inclusion content in steel, and crystal grain thinning.But too much aluminium, can promote continuously cast bloom to produce surface crack and reduce slab quality, Holo-Al content should be controlled at 0.020～0.050%.
The present invention further provides the preparation method of high-strength bridge steel plate, comprise following operation:
The check of desulfurizing iron pre-treatment → converter smelting → LF refining → RH refining → continuous casting → strand, judgement → strand examination → heating steel billet → de-scaling → rolling → cooling → flaw detection → tempering → cutting, sampling → spray printing sign → warehouse-in.
Wherein, desulfurizing iron pre-treatment → converter smelting → LF refining → RH vacuum-treat → continuous casting is for smelting continuous casting working procedure, desulfurizing iron is processed rear sulphur content and is controlled at S≤0.002%, converter control P content≤0.010%, LF carries out desulfating and deoxidation and alloying constituent adjustment, RH vacuumizes processing controls gas H content≤0.0003%, and continuous casting wraps temperature in liquidus line+10～20 ℃ in controlling.
Rolling process, adopts Controlled Rolling And Controlled Cooling, and continuous blank heating temperature is 1150 ℃～1200 ℃, austenite recrystallization district and the rolling of non-recrystallization district, the broken austenite crystal of roughing passage heavy reduction, roughing finishing temperature is controlled at 1050～1100 ℃, and finish rolling start rolling temperature is 870～930 ℃; Roll rear control cooling, red temperature is 500～600 ℃, subsequently air cooling.
During tempering, steel plate is heated between 550～650 ℃, carries out tempering heat treatment, tempering time is controlled at 1.5～2.0min/mm * thickness of slab+40min.
The present invention passes through to optimize Composition Design, converter smelting, and LF and RH refining, reasonable setting and optimization to cooling controlling and rolling controlling process, carry out tempering heat treatment.Plate property of the present invention is good, tensile strength is 720～800MPa, yield strength is 550～620MPa, unit elongation is >=18%, yield tensile ratio≤0.83 ,-40 ℃ of low temperature impact of collision >=200J, there is high strength (yield strength >=550MPa), good low-temperature flexibility and low yield tensile ratio, and there is good anti-seismic performance, and stable processing technique, workable.
The invention has the beneficial effects as follows:
1, the present invention is by reasonably adopting low-carbon (LC) Composition Design, and low-phosphorous sulphur smelting technology, coordinates other trace alloying elements, has strengthened the toughness and tenacity of low alloy steel.Adopt Controlled Rolling And Controlled Cooling and rational tempering process, guarantee that steel plate Microstructure and properties is even, obtain the high-strength bridge steel plate of impelling strength excellence.
2, the present invention adopts converter smelting, continuous casting etc. to produce bridge steel plate, adapts to numerous steel and looks forward to implementing.The present invention adopts TMCP+T explained hereafter high-performance bridge steel plate, has reduced production cost.
Accompanying drawing explanation
Fig. 1 is the figure of one embodiment of the invention 40mm low yield strength ratio high strength bridge steel plate tempering state sample tissue topography, is organized as a small amount of P of B+ needle-like F+ in figure.
Embodiment
Embodiment mono-
Each component ratio of the high-strength bridge steel plate of the present embodiment is as follows:
C:0.070%, Si:0.35%, Mn:1.35%, P:0.0077%, S:0.0011%, Cu:0.32%, Ni:0.40%, Nb:0.033%, V:0.025%, Alt:0.026%, all the other are Fe and inevitable impurity.
Wherein, the content of impurity is controlled at O≤0.0015%, N≤0.0080%, H≤0.0003%, As≤0.010%, Pb≤0.010%, Sn≤0.010%, Sb≤0.010%.
During preparation, adopt low-carbon (LC), low-phosphorous sulphur smelting technology, coordinate other trace alloying elements, effectively strengthen the toughness and tenacity of steel.Utilize Controlled Rolling And Controlled Cooling and rational tempering process, guarantee that steel plate Microstructure and properties is even, obtain the high-strength bridge steel plate of impelling strength excellence.Main operational path is: the check of desulfurizing iron pre-treatment → converter smelting → LF refining → RH refining → continuous casting → strand, judgement → strand examination → heating steel billet → de-scaling → rolling → cooling → flaw detection → tempering → cutting, sampling → spray printing sign → warehouse-in.
Adopt austenite recrystallization district and austenite non-recrystallization district two-stage control rolling technique, roughing adopts the broken austenite crystal of passage heavy reduction, and roughing finishing temperature is controlled at 1050～1100 ℃; Finishing rolling control start rolling temperature is 870～930 ℃; Roll rear control cooling, red temperature is 500～600 ℃, subsequently air cooling.Rolling process for cooling parameter refers to table 2.
Steel plate carries out tempering heat treatment, and tempering temperature is 550～650 ℃, within tempering time is controlled at (1.5～2.0) min/mm * thickness of slab+40min.Thermal treatment concrete technology parameter is as shown in table 3.
As shown in table 4 according to tempering state steel plate stretching performance of the present invention, low-temperature flexibility is as shown in table 5.The plate property result of the embodiment of the present invention is good, tensile strength is in 730MPa left and right, yield strength is 580MPa left and right, unit elongation is >=18%, yield tensile ratio≤0.83 ,-40 ℃ of low temperature impact of collision >=200J, there is high strength (yield strength >=550MPa), good low-temperature flexibility and low yield tensile ratio, and there is good anti-seismic performance, and stable processing technique, workable.
Produce this intensity rank steel plate, save quenching heat treatment technique, ton steel is saved approximately 200 yuan.
Embodiment bis-
Each component ratio of the high-strength bridge steel plate of the present embodiment is as follows:
C:0.071%, Si:0.35%, Mn:1.34%, P:0.0068%, S:0.0012%, Cu:0.32%, Ni:0.41%, Nb:0.035%, V:0.025%, Alt:0.024%, all the other are Fe and inevitable impurity.
Wherein, the content of impurity is controlled at O≤0.0015%, N≤0.0080%, H≤0.0003%, As≤0.010%, Pb≤0.010%, Sn≤0.010%, Sb≤0.010%.
During preparation, adopt low-carbon (LC), low-phosphorous sulphur smelting technology, coordinate other trace alloying elements, effectively strengthen the toughness and tenacity of steel.Utilize Controlled Rolling And Controlled Cooling and rational tempering process, guarantee that steel plate Microstructure and properties is even, obtain the high-strength bridge steel plate of impelling strength excellence.Main operational path is: the check of desulfurizing iron pre-treatment → converter smelting → LF refining → RH refining → continuous casting → strand, judgement → strand examination → heating steel billet → de-scaling → rolling → cooling → flaw detection → tempering → cutting, sampling → spray printing sign → warehouse-in.
Adopt austenite recrystallization district and austenite non-recrystallization district two-stage control rolling technique, roughing adopts the broken austenite crystal of passage heavy reduction, and roughing finishing temperature is controlled at 1050～1100 ℃; Finishing rolling control start rolling temperature is 870～930 ℃; Roll rear control cooling, red temperature is 500～600 ℃, subsequently air cooling.Rolling process for cooling parameter refers to table 2.
Steel plate carries out tempering heat treatment, and tempering temperature is 550～650 ℃, within tempering time is controlled at (1.5～2.0) min/mm * thickness of slab+40min.Thermal treatment concrete technology parameter is as shown in table 3.
As shown in table 4 according to tempering state steel plate stretching performance of the present invention, low-temperature flexibility is as shown in table 5.The plate property result of the embodiment of the present invention is good, tensile strength is in 730MPa left and right, yield strength is 580MPa left and right, unit elongation is >=18%, yield tensile ratio≤0.83 ,-40 ℃ of low temperature impact of collision >=200J, there is high strength (yield strength >=550MPa), good low-temperature flexibility and low yield tensile ratio, and there is good anti-seismic performance, and stable processing technique, workable.
Produce this intensity rank steel plate, save quenching heat treatment technique, ton steel is saved approximately 200 yuan.
Embodiment tri-
Each component ratio of the high-strength bridge steel plate of the present embodiment is as follows:
C:0.070%, Si:0.34%, Mn:1.34%, P:0.0078%, S:0.0008%, Cu:0.31%, Ni:0.40%, Nb:0.034%, V:0.023%, Alt:0.025%, all the other are Fe and inevitable impurity.
Wherein, the content of impurity is controlled at O≤0.0015%, N≤0.0080%, H≤0.0003%, As≤0.010%, Pb≤0.010%, Sn≤0.010%, Sb≤0.010%.
During preparation, adopt low-carbon (LC), low-phosphorous sulphur smelting technology, coordinate other trace alloying elements, effectively strengthen the toughness and tenacity of steel.Utilize Controlled Rolling And Controlled Cooling and rational tempering process, guarantee that steel plate Microstructure and properties is even, obtain the high-strength bridge steel plate of impelling strength excellence.Main operational path is: the check of desulfurizing iron pre-treatment → converter smelting → LF refining → RH refining → continuous casting → strand, judgement → strand examination → heating steel billet → de-scaling → rolling → cooling → flaw detection → tempering → cutting, sampling → spray printing sign → warehouse-in.
Adopt austenite recrystallization district and austenite non-recrystallization district two-stage control rolling technique, roughing adopts the broken austenite crystal of passage heavy reduction, and roughing finishing temperature is controlled at 1050～1100 ℃; Finishing rolling control start rolling temperature is 870～930 ℃; Roll rear control cooling, red temperature is 500～600 ℃, subsequently air cooling.The rolling of employing and embodiment mono-and two different thickness specifications, rolling process for cooling parameter refers to table 2.
Steel plate carries out tempering heat treatment, and tempering temperature is 550～650 ℃, within tempering time is controlled at (1.5～2.0) min/mm * thickness of slab+40min.Thermal treatment concrete technology parameter is as shown in table 3.
After embodiment tempering heat treatment, tissue be take bainite+ferrite as main.Fig. 1 is the excellent high-strength bridge steel plate tempering state sample metallographs of embodiment tri-40mm impelling strength, is organized as a small amount of P of B+ needle-like F+.As seen from Figure 1, homogeneous microstructure is tiny, effectively improves obdurability.
As shown in table 4 according to tempering state steel plate stretching performance of the present invention, low-temperature flexibility is as shown in table 5.The plate property result of the embodiment of the present invention is good, tensile strength is in 730MPa left and right, yield strength is 580MPa left and right, unit elongation is >=18%, yield tensile ratio≤0.83 ,-40 ℃ of low temperature impact of collision >=200J, there is high strength (yield strength >=550MPa), good low-temperature flexibility and low yield tensile ratio, and there is good anti-seismic performance, and stable processing technique, workable.
Produce this intensity rank steel plate, save quenching heat treatment technique, ton steel is saved approximately 200 yuan.
The main chemical compositions of table 1 embodiment of the present invention (wt%)
| Embodiment | C | Si | Mn | P | S | Ni | Cu | Nb | V | Alt |
| Embodiment mono- | 0.070 | 0.35 | 1.35 | 0.0077 | 0.0011 | 0.40 | 0.32 | 0.033 | 0.025 | 0.026 |
| Embodiment bis- | 0.071 | 0.35 | 1.34 | 0.0068 | 0.0012 | 0.41 | 0.32 | 0.035 | 0.025 | 0.024 |
| Embodiment tri- | 0.070 | 0.34 | 1.34 | 0.0078 | 0.0008 | 0.40 | 0.31 | 0.034 | 0.023 | 0.025 |
Table 2 rolling process for cooling parameter
| Embodiment | Thickness mm | Roughing finishing temperature ℃ | Finish rolling start rolling temperature ℃ | Finishing temperature ℃ | Red temperature ℃ |
| Embodiment mono- | 16 | 1067 | 890 | 843 | 581 |
| Embodiment bis- | 16 | 1062 | 896 | 850 | 588 |
| Embodiment tri- | 40 | 1058 | 887 | 846 | 576 |
Table 3 heat treatment process parameter
Table 4 embodiment of the present invention tempering state steel plate stretching performance
| Embodiment | Thickness/mm | Yield strength/MPa | Tensile strength/MPa | Unit elongation/% | Yield tensile ratio |
| Embodiment 1 | 16 | 593 | 729 | 20.9 | 0.81 |
| Embodiment 2 | 16 | 588 | 734 | 21.2 | 0.80 |
| Embodiment 3 | 40 | 576 | 731 | 20.6 | 0.79 |
Table 5 embodiment of the present invention tempering state steel plate low-temperature flexibility
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (7)
1. a high-strength bridge steel plate, it is characterized in that: comprise by weight percentage following component: C:0.05～0.09%, Si:0.25～0.50%, Mn:1.30～1.60%, P :≤0.010%, S :≤0.0020%, Cu:0.30～0.55%, Ni:0.20～0.80%, Nb:0.025～0.060%, V:0.02～0.06%, Alt:0.020～0.050%, all the other are Fe and inevitable impurity.
2. high-strength bridge steel plate according to claim 1, it is characterized in that: comprise by weight percentage following component: C:0.070%, Si:0.35%, Mn:1.35%, P:0.0077%, S:0.0011%, Cu:0.32%, Ni:0.40%, Nb:0.033%, V:0.025%, Alt:0.026%, all the other are Fe and inevitable impurity.
3. high-strength bridge steel plate according to claim 2, is characterized in that: the weight percent of described impurity element is O≤0.0015%, N≤0.0080%, H≤0.0003%, As≤0.010%, Pb≤0.010%, Sn≤0.010%, Sb≤0.010%.
4. the preparation method of high-strength bridge steel plate according to claim 1, comprises following operation: the check of desulfurizing iron pre-treatment → converter smelting → LF refining → RH refining → continuous casting → strand, judgement → strand examination → heating steel billet → de-scaling → rolling → cooling → flaw detection → tempering → cutting, sampling → spray printing sign → warehouse-in.
5. the preparation method of high-strength bridge steel plate according to claim 4, it is characterized in that: desulfurizing iron pre-treatment → converter smelting → LF refining → RH vacuum-treat → continuous casting is for smelting continuous casting working procedure, desulfurizing iron is processed rear sulphur content and is controlled at S≤0.002%, converter control P content≤0.010%, LF carries out desulfating and deoxidation and alloying constituent adjustment, RH vacuumizes processing controls gas H content≤0.0003%, and continuous casting wraps temperature in liquidus line+10～20 ℃ in controlling.
6. the preparation method of high-strength bridge steel plate according to claim 4, it is characterized in that: rolling process, adopt Controlled Rolling And Controlled Cooling, continuous blank heating temperature is 1150 ℃～1200 ℃, austenite recrystallization district and the rolling of non-recrystallization district, the broken austenite crystal of roughing passage heavy reduction, roughing finishing temperature is controlled at 1050～1100 ℃, and finish rolling start rolling temperature is 870～930 ℃; Roll rear control cooling, red temperature is 500～600 ℃, subsequently air cooling.
7. the preparation method of high-strength bridge steel plate according to claim 4, is characterized in that: during tempering, steel plate is heated between 550～650 ℃, carries out tempering heat treatment, tempering time is controlled at 1.5～2.0min/mm * thickness of slab+40min.
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| CN105483538A (en) * | 2015-12-10 | 2016-04-13 | 南京钢铁股份有限公司 | High-strength anti-seismic structural steel and manufacturing process thereof |
| CN107805754A (en) * | 2016-09-09 | 2018-03-16 | 中国石化工程建设有限公司 | A kind of low-temperature pressure container forging and preparation method thereof |
| CN109957706A (en) * | 2017-12-14 | 2019-07-02 | 鞍钢股份有限公司 | Round steel for 325MPa bridge anti-falling beam and manufacturing method thereof |
| CN110424257A (en) * | 2019-08-13 | 2019-11-08 | 闫军亭 | A kind of shock-absorbing bridge support using grapheme material |
| WO2024016419A1 (en) * | 2022-07-22 | 2024-01-25 | 南京钢铁股份有限公司 | Low-yield-ratio weather-resistant bridge steel and manufacturing method |
| CN117840210A (en) * | 2023-12-19 | 2024-04-09 | 包头钢铁（集团）有限责任公司 | A rolling production method for H-shaped steel for high-strength and high-toughness bridge structure |
| CN119464926A (en) * | 2024-09-29 | 2025-02-18 | 南京钢铁股份有限公司 | A 620MPa grade steel plate for low yield strength ratio bridge and its preparation method |
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| CN105483538A (en) * | 2015-12-10 | 2016-04-13 | 南京钢铁股份有限公司 | High-strength anti-seismic structural steel and manufacturing process thereof |
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| CN117840210A (en) * | 2023-12-19 | 2024-04-09 | 包头钢铁（集团）有限责任公司 | A rolling production method for H-shaped steel for high-strength and high-toughness bridge structure |
| CN119464926A (en) * | 2024-09-29 | 2025-02-18 | 南京钢铁股份有限公司 | A 620MPa grade steel plate for low yield strength ratio bridge and its preparation method |
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