CN108486466B - A kind of yield strength 550MPa grade high ductility weather-resistant steel plate and preparation method thereof - Google Patents
A kind of yield strength 550MPa grade high ductility weather-resistant steel plate and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The invention discloses a kind of yield strength 550MPa grade high ductility weather-resistant steel plates and preparation method thereof, including following chemical component and weight percent: C:0.05~0.10%；Si:0.10%~0.40%；Mn:1.20~1.70%；P :≤0.012%；S :≤0.008%；Cr:0.40~0.80%；Ni:0.15~0.40%；Cu:0.25~0.40%；Als:0.015~0.040%；Nb:0.030~0.070%；Ti:0.010~0.040%；And meet Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B≤0.20%；Surplus is Fe and is inevitably mingled with.The microscopic structure for the weather-resistant steel plate that disclosed method obtains according to the present invention is ferrite+granular bainite+a small amount of pearlite heterogeneous structure, ReLFor 560~650MPa, RmIt is 22.0%~26.0% for 680~780MPa, A, -40 DEG C of longitudinal charpy V impact energy KV2> 70J, and there is excellent welding performance, cold bending performance and atmospheric corrosion resistance.
Description
Technical field
The invention belongs to steel material and its manufacturing fields, and in particular to resistance to a kind of yield strength 550MPa grade high ductility
Wait steel plate and preparation method thereof.
Background technique
Weathering steel, that is, weather resisting steel, due to being widely used in container, iron with excellent atmospheric corrosion resistance
The industries such as road vehicle, bridge, building.Currently, the yield strength of domestic weathering steel still with 345MP grade with 450MPa grades based on,
Recently as the rapid development of the industries such as rail truck, container, higher want also proposed to the comprehensive performance of weathering steel
It asks.The higher weathering steel of use intensity rank can reduce the dosage of steel, mitigate steel member own wt and realize lightweight, subtract
Few fuel consumption and noxious gas emission.Northern China extremely cold area winter minimum temperature reaches -40 DEG C or so, makes in this area
The low-temperature flexibility that weather-proof steel construction piece also needs to have excellent simultaneously, to improve the safety of steel construction.Therefore using more
The high tenacity weathering steel of high intensity levels is very necessary to the lightweight and raising safety of realizing steel construction.
Patent No. CN 102409253A, CN 101994064A, CN 101792888A disclose 550MPa grades of yield strength
Weathering steel and its manufacturing method, be all made of the design of Ultra-low carbon high-Cr ingredient, Cr element additive amount is respectively 2.15~
4.0%, 2.5~7.0%, 2.50~3.50%, due to being added to a large amount of Cr element, on the one hand increase STEELMAKING PRODUCTION hardly possible
Degree, manufacturing cost also improve a lot.
Summary of the invention
The purpose of the present invention is to provide a kind of yield strength 550MPa grade high ductility hot rolling weather-resisting steel plate and its preparation sides
Method, the weathering steel have good low-temperature flexibility, corrosion resistance and welding performance, and production economy, can be applied to
The manufacture of container, rail truck, outdoor engineering structure part etc..
The technical scheme adopted by the invention is as follows:
A kind of yield strength 550MPa grade high ductility weather-resistant steel plate, including following chemical component and weight percent:
C:0.05~0.10%；Si:0.10%~0.40%；Mn:1.20~1.70%；P :≤0.012%；S :≤
0.008%；Cr:0.40~0.80%；Ni:0.15~0.40%；Cu:0.25~0.40%；Als:0.015~0.040%；
Nb:0.030~0.070%；Ti:0.010~0.040%；And meet Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Mo/15+
Ni/60+V/10+5B≤0.20%；Surplus is Fe and is inevitably mingled with.
Further, it is preferable to which being includes following chemical component and weight percent: C:0.06~0.08%；Si:0.18%
~0.30%；Mn:1.32~1.56%；P :≤0.010%；S :≤0.006%；Cr:0.41~0.67%；Ni:0.15~
0.25%；Cu:0.25~0.35%；Als:0.030~0.040%；Nb:0.040~0.053%；Ti:0.022~
0.033%；Surplus is Fe and is inevitably mingled with.
The present invention also provides the preparation method of the yield strength 550MPa grade high ductility weather-resistant steel plate, the preparation sides
Method include the following steps: molten iron pre-process deep desulfurization → converter top bottom blowing → external refining → continuous casting → heating of plate blank →
Hot continuous rolling → section cooling → batches.
Refining is handled using LF furnace, and molten steel casting whole process carries out protective casting using weathering steel mould flux.
Slab heating temperature is 1200 DEG C~1250 DEG C.
In the hot continuous rolling step, rough rolling step is rolled back and forth using 2 frame, four roll reversing roller, roughing finishing temperature
Control adds up reduction ratio >=80% at 1050 DEG C or more, refines crystal grain by austenite recrystallization area.
In the hot continuous rolling step, the finish rolling stage carries out tandem rolling using 7 frame high CVC mills, adds up deflection >=85%,
Finish rolling finishing temperature is 820~880 DEG C.If the excessively high one side of finishing temperature will lead to the increasing of belt steel surface iron scale content
Add influence product surface quality, on the other hand will lead to grain coarsening reduces the obdurability of material；Finishing temperature is too low, easily causes
Mixed crystal reduces material plasticity.
In the section cooling step, cooling rate is 15~35 DEG C/s, and cooling velocity leads to coiling temperature mistake slowly excessively
Height, grain coarsening, the strength of materials are insufficient；Too fast will lead to of cooling velocity generates ferrite bainite, martensitic structure, significantly reduces
The plasticity and toughness of material.
Described to batch in step, for oiler temperature control at 550~620 DEG C, hot rolled coil is air-cooled to room temperature.
The microscopic structure for the weather-resistant steel plate that disclosed method obtains according to the present invention be ferrite+granular bainite+
A small amount of pearlite heterogeneous structure, grain size number are 11.0~13.0；Its ReLFor 560~650MPa, RmFor 680~
780MPa, A are 22.0%~26.0%, -40 DEG C of longitudinal charpy V impact energy KV2> 70J.
The present invention is that the intensity for improving weathering steel and low-temperature flexibility take following methods:
1) high-quality clean steel smelting process control technology is used, S content is controlled 0.0050% hereinafter, external refining
Molten Steel Cleanliness is improved, molten steel casts whole process using mould flux protective casting, avoids molten steel by secondary oxidation, reduce steel
On the one hand non-metallic inclusion content in water improves atmospheric corrosion resistance, on the other hand improves its plasticity and toughness.
2) be different from traditional Cu-P-Cr-Ni system weathering steel, P content controlled 0.012% when ingredient designs hereinafter,
Its atmospheric corrosion resistance is improved by reasonable Cu, Cr and Ni Match of elemental composition, to reduce P element in cyrystal boundary segregation to steel
The adverse effect of low-temperature flexibility.
3) it is designed using low C, reduces C solution strengthening to the adverse effect of low-temperature flexibility；Nb+Ti combined microalloying, mentions
The high intensity, plasticity and toughness and welding performance.
4) 550~620 DEG C are used to batch so that the microscopic structure of steel plate is ferrite+granular bainite+a small amount of pearlite
Heterogeneous structure；Ferritic structure has excellent plasticity and toughness, bainite intensity with higher, and the present invention passes through ingredient and controlled rolling
Cold technological design is controlled, to improve the intensity and plasticity and toughness of material.
Steel plate of the present invention has excellent welding performance and cold bending performance.Welding cold cracking sensitivity coefficient Pcm≤
0.20%；After 180 ° of clod washes (d=a), bend specimen lateral surface does not have crackle appearance, adds convenient for the forming of downstream user
Work；With good atmospheric corrosion resistance, relative to Q345B steel corrosion rate < 55%.
Detailed description of the invention
Fig. 1 is the yield strength 550MPa grade high ductility weather-resistant steel plate metallographic structure in embodiment 1.
Specific embodiment
Below by way of specific embodiment, technical scheme is described further.
The present invention provides a kind of yield strength 550MPa grade high ductility weather-resistant steel plate and its manufacturing method, and chemical component meets
Weight percent (wt%): C:0.05~0.10%；Si:0.10%~0.40%；Mn:1.20~1.70%；P :≤
0.012%；S :≤0.008%；Cr:0.40~0.80%；Ni:0.15~0.40%；Cu:0.25~0.40%；Als:0.015
~0.040%；Nb:0.030~0.070%；Ti:0.010~0.040%；And meet following welding cold cracking sensitivity system simultaneously
Number Pcm requirement, Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B≤0.20%；Remaining is for Fe and not
Evitable impurity element.
The present invention is produced using hot continuous rolling process, and process flow includes: that the deep desulfurization → converter top bottom of molten iron pretreatment is compound
Blowing → external refining → continuous casting → heating of plate blank → hot continuous rolling → section cooling → batches.
1) molten iron pre-processes deep desulfurization to [S]≤0.0050%, and refining is handled using LF furnace, reduces non-metallic inclusion and contains
Amount, molten steel cast whole process use mould flux protective casting, the continuous casting steel billet with a thickness of 230mm.
2) hot continuous rolling first heats slab, and heating temperature is 1200 DEG C~1250 DEG C, promotes austenite homogenization
It is sufficiently dissolved with alloying element.
3) then slab, which is come out of the stove, carries out roughing and finish rolling in hot tandem by high-pressure water descaling.Rough rolling step is in Ovshinsky
The rolling of body recrystallization zone, is rolled back and forth using 2 frame four-high reversing mills.Rough rolling step rolling temperature is controlled at 1050 DEG C
More than, add up reduction ratio >=80%, carries out multi- pass rolling in austenite recrystallization area, promote austenite recrystallization softening repeatedly
Crystal grain.The finish rolling stage carries out tandem rolling using 7 frame high CVC mills, which rolls in austenite Unhydrated cement, adds up deformation
Amount >=85%.By adding up large deformation, increases deformation band and dislocation density in deformed austeaite, increase the refinement of phase transformation nucleation point
Crystal grain.The finish rolling finishing temperature is 820~880 DEG C,
4) control cooling is carried out after finish rolling, is batched, and for oiler temperature control at 550~620 DEG C, hot rolled coil is air-cooled to room
Temperature.
The embodiment of the present invention and the chemical component of comparative example are as shown in table 1.
The chemical component of 1 embodiment of the present invention of table
The main rolling technological parameter and mechanical property of embodiment steel and comparative example are as shown in table 2.
2 rolling process main technologic parameters of table and mechanical property
72h alternate-immersion has been carried out according to TB/T 2375 " railway weathering steel alternate-immersion test method "
Test, with Q345B low-alloy steel and Q450NQR1 high-strength weathering steel sample as a comparison, when by calculating each corrosion sample unit
Between unit area corrosion weight loss amount average value acquire average corrosion weight loss rate, test result is as shown in table 3.Height in embodiment
Toughness weathering steel improves 1 times relative to Q345B low-alloy steel corrosion resistance, has excellent atmospheric corrosion resistance.
3 atmospheric corrosion resistance of table
What above-mentioned reference embodiment carried out a kind of yield strength 550MPa grade high ductility weather-resistant steel plate and preparation method thereof
Detailed description, is illustrative without being restrictive, can enumerate several embodiments according to limited range, therefore not
The change and modification being detached under present general inventive concept, should belong within protection scope of the present invention.
Claims (6)
1. a kind of yield strength 550MPa grade high ductility weather-resistant steel plate, which is characterized in that including following chemical component and weight hundred
Divide ratio: C:0.06 ~ 0.08%；Si:0.18% ~ 0.30%；Mn:1.32 ~ 1.56%；P :≤0.010%；S :≤0.006%；
Cr:0.41 ~ 0.67%；Ni:0.15 ~ 0.25%；Cu:0.25 ~ 0.35%；Als:0.030 ~ 0.040%；0.040 ﹤ Nb≤
0.053%；Ti:0.022 ~ 0.033%；And meet Pcm=C+Si/30+(Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B
≤0.20%；Surplus is Fe and is inevitably mingled with；
The preparation method of the yield strength 550MPa grade high ductility weather-resistant steel plate includes the following steps: that molten iron pretreatment is deep de-
Sulphur → converter top bottom blowing → external refining → continuous casting → heating of plate blank → hot continuous rolling → section cooling → batches；
In the section cooling step, cooling rate is 15~35 DEG C/s；
The microscopic structure of the weather-resistant steel plate is ferrite+granular bainite+pearlite heterogeneous structure；Its ReLFor 560~
650MPa, RmIt is 22.0%~26.0% for 680~780MPa, A, -40 DEG C of longitudinal charpy V impact energy KV2> 70J.
2. yield strength 550MPa grade high ductility weather-resistant steel plate according to claim 1, which is characterized in that refining uses LF
Furnace processing, molten steel cast whole process using covering slag protective casting.
3. yield strength 550MPa grade high ductility weather-resistant steel plate according to claim 1, which is characterized in that heating of plate blank temperature
Degree is 1200 DEG C~1250 DEG C.
4. yield strength 550MPa grade high ductility weather-resistant steel plate according to claim 1, which is characterized in that the hot continuous rolling
In step, rough rolling step is rolled back and forth using 2 frame four-high reversing mills, roughing finishing temperature control 1050 DEG C with
On, add up reduction ratio >=80%.
5. yield strength 550MPa grade high ductility weather-resistant steel plate according to claim 1 or 2, which is characterized in that the heat
In tandem rolling step, the finish rolling stage carries out tandem rolling using 7 frame high CVC mills, adds up deflection >=85%, and finish rolling finishing temperature is
820~880 DEG C.
6. yield strength 550MPa grade high ductility weather-resistant steel plate according to claim 1, which is characterized in that described to batch step
In rapid, for oiler temperature control at 550~620 DEG C, hot rolled coil is air-cooled to room temperature.
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| CN109338212B (en) * | 2018-09-26 | 2019-11-26 | 武汉钢铁有限公司 | Using the yield strength >=550MPa thin gauge weathering steel and method of short route production |
| CN109266960B (en) * | 2018-09-26 | 2019-11-26 | 武汉钢铁有限公司 | Using the tensile strength >=800MPa thin gauge weathering steel and method of short route production |
| CN109609845A (en) * | 2018-12-16 | 2019-04-12 | 唐山钢铁集团有限责任公司 | A kind of 500MPa grades of weathering steel and its production method |
| CN110042300B (en) * | 2019-04-02 | 2020-11-20 | 鞍钢股份有限公司 | Wire rod for 400 MPa-grade weather-resistant stud, production method and prepared stud |
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| CN111926261A (en) * | 2020-08-31 | 2020-11-13 | 日照钢铁控股集团有限公司 | High-strength weathering steel with yield strength of 550MPa and production method thereof |
| CN112176259A (en) * | 2020-10-14 | 2021-01-05 | 邯郸钢铁集团有限责任公司 | 550 Mpa-grade high-strength weathering steel and production method thereof |
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| US20240158880A1 (en) * | 2021-09-17 | 2024-05-16 | Nanjing Iron & Steel Co., Ltd. | Micro-molybdenum-type weathering bridge steel plate and preparation method thereof |
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| CN101660099B (en) * | 2009-10-16 | 2011-12-21 | 江苏省沙钢钢铁研究院有限公司 | High-strength low-alloy hot-rolled ferrite bainite weathering steel and production method thereof |
| CN106947913B (en) * | 2017-03-21 | 2019-03-19 | 马钢(集团)控股有限公司 | A kind of high-strength high-toughness hot rolls weather-resistant steel plate and preparation method thereof |
| CN107460413B (en) * | 2017-08-16 | 2019-05-17 | 北京科技大学 | A kind of preparation method and application of 550MPa grades of Ultra-fine Grained high-strength weathering steel |
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