CN107604256A - A kind of preparation method of 700MPa levels automotive frame steel band - Google Patents

A kind of preparation method of 700MPa levels automotive frame steel band Download PDF

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Publication number
CN107604256A
CN107604256A CN201710702680.5A CN201710702680A CN107604256A CN 107604256 A CN107604256 A CN 107604256A CN 201710702680 A CN201710702680 A CN 201710702680A CN 107604256 A CN107604256 A CN 107604256A
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temperature
roughing
steel
rolling
automotive frame
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武会宾
许立雄
秦哲
谢国海
刘守杰
郑旭涛
郑万任
谢基表
季伟斌
张继勇
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Beijing University of Technology
University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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Abstract

The present invention relates to thin plate blank continuously casting and continuously rolling technology field, there is provided a kind of preparation method of 700MPa levels automotive frame steel band, continuous casting billet are directly entered 3 frame roughing mills without reheating, are continuously depressed greatly by 3 passages(50%~60%)After roughing, austenite crystal significantly refines, and after roughing, middle base quickly heats up to temperature needed for finish rolling entrance by induction heater, while forms reverse temperature field.It is 2.5 3.0mm × 1500mm that the present invention, which can obtain dimensions, grain size reaches 12.5 13.5 grades, yield strength > 600MPa, and tensile strength is 700 880MPa high-strength automotive frame hot rolled strip, it can be achieved " with Bao Daihou ", make Vehicle mass reduction, and " with hot Dai Leng ", improve production efficiency, reduce production cost, energy consumption is reduced simultaneously, is reduced discharge, is realized resource-conserving, environmentally friendly production.

Description

A kind of preparation method of 700MPa levels automotive frame steel band
Technical field
The present invention relates to thin plate blank continuously casting and continuously rolling technology field, more particularly to a kind of system of 700MPa levels automotive frame steel band Preparation Method.
Background technology
Automotive frame is the main load-supporting part of truck, almost carries the whole weight of goods, therefore automobile is big The quality of joist steel directly influences the traffic safety and service life of vehicle.In automobile manufacture industry, beam steel is typically adopted With stamping and rolling forming process, its mode of texturing is based on cold deformation, therefore it is required that beam steel possesses good synthesis Performance, particularly forming property.
The use of more beam steel is mostly in the market 510MPa and 610MPa levels (tensile strength).In recent years, With world energy sources crisis and the aggravation of environmental pollution, automotive light weight technology turns into development trend.According to external correlative study data, Steel plate thickness reduces 0.1mm, and vehicle can be made to mitigate 12% from quality, oil consumption is reduced by 5%~8%, while body lightening Effective mounted mass of automobile is added, conevying efficiency is improved, reduces cost of transportation.The intensity of steel plate is improved, can be passed through " lightweight of automobile itself is realized with Bao Daihou ", therefore, the research and development of the high-strength beam steel of 700MPa levels become major Steel mill and associated vehicle manufacturer focus of attention.
The reinforcing approach of tensile strength 700MPa and above rank automobile steel is mainly that the synthesis of a variety of intensifying methods makes With main two kinds of reinforcing and precipitation strength in a organized way from the point of view of intensity contribution, build up is by adding a certain amount of quenching degree Element, cooled down with reference to controlled rolling and control, obtain middle low-temperature transformation tissue to improve armor plate strength, this steel grade combination property is excellent It is good;Precipitation strength mainly adds the microalloy elements such as Ti, Nb, V, passes through the precipitation strength ferrite of carbonitride second phase particles Matrix, so as to improve intensity, precipitation strength steel cost is relatively low, and formability is preferable, but toughness is slightly poorer to low-carbon bainite steel.
At present, 700MPa levels automotive frame steel band is more using the rolling of sheet billet list base or semi-endless rolled technique, its tradition Production process is:" → pickling → cold rolling → annealing is batched in continuous casting → strand reheating → roughing → finish rolling → section cooling →. Continuous casting billet is heated using the rolling bottom formula stove or induction heater of 200-280m length as this rolling mill practice is previous in roughing, And cocurrent is carried out using rolling bottom formula, causes the increase of production line length, equipment composition is complicated, Operation and Maintenance cost is high, energy consumption The shortcomings of high.And because production line is long (more than 400m), essence is pricked inlet temperature and can not accurately controlled, and causes product finally to be organized Performance is unstable.In addition, the hot rolling surface quality and product specification of this single base rolling of tradition or semi-endless rolled production be not up to To downstream user requirement, the hot rolled plate after pickling generally requires could supply by follow-up cold rolling, annealing process so that production work Sequence is numerous and diverse, production efficiency reduces, production cost increase.Such as:In October, 2009 is published in《Steel research》Volume 37, the 5th phase, 1-3 pages, " exploitation of pearl steel EAF-CSP flow 700MPa level titanium microalloying high-strength steel " and in September, 2013 are published in《Beijing University of Science and Technology's journal》Volume 35, the 9th phase, 1169-1173 pages, " CSP production 700MPa level high-strength steel coiled sheets oxide layer distribution rule Rule ".
With the raising of China's metallurgical technology and equipment level, the quality of hot-rolled product improves constantly, and product specification is continuous It is thinned, in face of global energy crisis and environmental pollution, " following production development side of CSP is turned into hot Dai Leng " To.Meanwhile as the development of thin plate blank continuously casting and continuously rolling technology, single base rolling and semi-endless rolled technique are being asked present on production Topic gradually appears, and Endless Rolling Technology shows its innate advantage, and as the important development side of following serialization rolling technique To.
The content of the invention
The purpose of the present invention is exactly overcome the deficiencies in the prior art, there is provided a kind of system of 700MPa levels automotive frame steel band Preparation Method, by " automobile itself lightweight being realized with Bao Daihou ", by " solving high-strength automotive frame steel band with hot Dai Leng " to pass Production line present in single base rolling or semi-endless rolled technique of uniting is tediously long, equipment composition complexity, low production efficiency, Operation and Maintenance The problems such as cost is high, high energy consumption.
The purpose of the present invention is achieved through the following technical solutions:
A kind of preparation method of 700MPa levels automotive frame steel band of the present invention, using Endless Rolling Technology;Continuous casting billet without Cross reheating and be directly entered roughing mills;Middle base entry temperature at finishing is accurately controlled by sensing heating;Whole process is except volume Outside taking, there is strip to be joined directly together, production process is without threading and throws steel.
Further, specific steps include continuous casting, roughing, finish rolling, section cooling, batched.
Further, the chemical composition of the raw material of the 700MPa levels automotive frame steel band is distinguished by mass percentage For:C 0.04-0.06%;Si 0.10-0.40%;Mn 1.60-1.70%;Als 0.02-0.04%;Ti 0.05- 0.07%;Nb 0.03-0.07%;V 0.04-0.07%;P≤0.015%;S≤0.006;N≤0.0050, remaining be iron and Inevitable impurity.
Further, the product specification of the 700MPa levels automotive frame steel band is 2.5-3.0mm × 1500mm, tissue For single-phase ferrite, grain size is 12.5-13.5 levels, yield strength > 600MPa, tensile strength 700-880MPa, elongation > 12.0%, yield tensile ratio < 0.94,180 ° of performances of clod wash are qualified, final products lumber recovery > 98%.
Further, thickness of strand 80-100mm, pulling rate 3-7m/min, maximum molten steel flow 6.5t/min.
Further, into 1200 DEG C of the strand core temperature > of roughing mill, about 1100 ± 100 DEG C of surface temperature, formed Reverse Temperature Distribution pattern;Roughing single pass rolling reduction 50%, form the thick middle bases of 14-16mm.
Further, the maximum heating of sensing heating is 300 DEG C before essence is pricked, and the middle sensed temperature after heating of base is 1155- 1165 DEG C, it is 820-840 DEG C to prick temperature eventually.
Further, molten iron forms molten steel, tundish temperature after BOF converter smeltings, the refining of LF stoves, the refining of RH stoves successively Spend for 1540-1550 DEG C, degree of supercooling is 20-30 DEG C.
Further, conticaster is provided with the funnel-form crystallizer and expert system of electro-magnetic braking functions, possesses dynamic and adjusts Wide and breakout prediction function, bending section are furnished with wick-containing press function, can optimize crystallizer flow field, fan-shaped section is furnished with slighter compress work( Can, center porosity and segregation can be mitigated, cooling system possesses dynamic water allocation function, monitors the hot resume of online strand in real time, essence Really control strand temperature.
Application of the above-mentioned preparation method on ESP production lines, the ESP production lines are endless rolling production line, total length 190m, molten steel last 7min from conticaster to coiling machine.
Beneficial effects of the present invention are:CSP Endless Rolling Technology is employed, Thin Specs can either be met The production technology demand of the strong automotive frame strip of superelevation, realization " with Bao Daihou ", make Vehicle mass reduction, so as to increase automobile Effective mounted mass, reduce fuel consumption, improve conevying efficiency, and can enough shortens technological process, improves the surface matter of hot rolled strip Amount, the thickness specification of hot-strip is reduced, realizing " with hot Dai Leng ", so as to improve production efficiency, reduces production cost, drop simultaneously Low energy consumption, discharge is reduced, reaches resources conservation, environmentally friendly production.
Figure of description
Fig. 1 show the ESP endless rollings life for being applied to production 700MPa level automotive frame steel bands in the embodiment of the present invention Producing line schematic flow sheet.
Fig. 2 show microcosmic appearance of the single-phase ferrite of the fine uniform obtained in embodiment 2 under ESEM.Figure 3 show microscopic appearance of the precipitate of the nanoscale even dispersion distribution obtained in embodiment 4 under ESEM.
Wherein:The straight circular-arc type continuous casting machine of 1- tundish, 2-;The frame roughing mills of 3- tri-;4- rocking shears;5- pushes away useless roller-way;6- turns Hub is cut;7- induction heaters;8- high pressure dephosphorizing machines;The frame finishing mills of 9- five;10- cooling facility for laminar flow;11- high-speed flying shears;12- Downcoiler;PF represents that polygonal ferrite, QF represent that quasi-polygonal ferrite, AF represent acicular ferrite in Fig. 2.
Embodiment
The specific embodiment of the invention is described in detail below in conjunction with specific accompanying drawing.It should be noted that in following embodiments The combination of the technical characteristic or technical characteristic of description is not construed as isolated, and they can be mutually combined so as to reach To superior technique effect.In the accompanying drawing of following embodiments, identical label that each accompanying drawing occurs represent identical feature or Person's part, it can be applied in different embodiments.
In the art, continuous casting billet is obtained after continuous casting, middle base is obtained after roughing, sheet billet is obtained after finish rolling.
With reference to the process characteristic of ESP endless rollings production line in Fig. 1, to make the tensile strength of exploitation steel band reach 700MPa Rank, while meet the matched well of toughness, weldability and formability, composition is designed using low-carbon high-manganese, and adds microalloy Change element ti, Nb, V, use the specific chemical composition of raw material as (mass percent):C 0.04-0.06%;Si 0.10- 0.40%;Mn 1.60-1.70%;Als 0.02-0.04%;Ti 0.05-0.07%;Nb 0.03-0.07%;V 0.04- 0.07%;P≤0.015%;S≤0.006;N≤0.0050, remaining is iron and inevitable impurity.
Wherein, C mass fraction is 0.04-0.06%, it is therefore an objective to casting process is avoided peritectic reaction, prevents continuous casting billet Process of setting amount of contraction is big, and crackle even bleed-out is formed in follow-up roughing.Meanwhile too high C content can also make the plasticity of steel Decline, seriously affect the cold formability energy and weldability of steel.
Mass fractions of the Si in raw material is 0.10-0.40%, and it is acted on primarily as ferrite former, is risen To solution strengthening effect, Si can be used as reducing agent and deoxidier in steelmaking process in addition.
Mn mass fractions in raw material are 1.60-1.70%, on the one hand Mn ensures that low-carbon is set by solution strengthening effect The intensity of timing steel, on the other hand, Mn can expand γ areas, reduce γ → α phase transition temperatures, promote raw material in embodiment to obtain standard Polygonal ferrite or acicular ferrite structure, so as to improve matrix strength.But too high Mn contents can influence the cold punching of steel Pressure and welding performance, while cause rolling load to increase.
The mass fraction of Ti, Nb, V in raw material is respectively 0.05-0.07%, 0.03-0.07%, 0.04-0.07%, Trace Ti, Nb, V are added mainly using the precipitation strength of carbonitride particle, to ensure the intensity of steel.But sheet blank continuous casting In tandem rolling process, too high Ti contents easily cause strand the operation of rolling occur side split and cause mechanical property it is unstable, mistake High Nb contents easily cause mixed crystal.And due in steel C, N content it is relatively low, too high Ti, Nb, V content can not play enough Invigoration effect, the cost of steel can be increased on the contrary.In addition, addition Ti, Nb, V element can improve the recrystallization temperature of steel in steel so that Steel can be completed to roll while obtain the deformed austenite tissue for storing large deformation energy at a higher temperature, and then obtain tiny Phase-change organization, the intensity of steel is improved by refined crystalline strengthening.
P, the mass fraction of S, N in raw material be respectively≤0.015% ,≤0.006 ,≤0.0050, P easily formed it is serious Segregated zone, in the ESP endless rolling production processes described in embodiment, P addition can greatly improve the rank of banded structure. Due to use high Mn composition designs, S in steel with formed MnS field trashes with segregation.N easily generates thick liquid in high-temperature region with Ti TiN is analysed, the Ti in steel is lost precipitating reinforcing effect.Therefore, the 700MPa level automobiles based on the production of ESP Endless Rolling Technologies are big Joist steel band, should try one's best the P, S controlled in steel, N content are in relatively low scope.
The molten steel for smelting to obtain according to mentioned component, the ESP endless rolling production lines shown in accompanying drawing 1 will be direct plungeed into, it is raw Producing line total length 190m, molten steel last 7min from conticaster to coiling machine, and whole process has strip to be joined directly together, before by coiling machine High-speed flying shear carries out bundling, and production process does not have threading and throws steel, and specific production procedure is as follows:
(1) molten iron is refined by BOF converter smeltings, the refining of LF stoves, RH stoves successively, obtains mentioned component molten steel, control Middle Baogang's coolant-temperature gage is 1540-1550 DEG C, and the degree of superheat is 20-30 DEG C.
(2) straight circular-arc type continuous casting machine of Baogang's water by 20.14m length forms the thick continuous casting billets of 80-100mm in.Conticaster is matched somebody with somebody There are 1.2m long, the funnel-form crystallizer with electromagnetic braking and expert system, possess dynamic and adjust wide and breakout prediction function, can improve Molten Steel Cleanliness, and properly increase pulling rate.Conticaster bending is short to be furnished with wick-containing press function, can optimize crystallizer flow field, improves Inner Quality of Billet.Fan-shaped section is furnished with slighter compress function, can mitigate center porosity and segregation.Secondary cooling possesses dynamic water allocation work( Can, the hot resume of online strand are monitored in real time, it is accurate to control strand temperature, meet requirement of the follow-up milling train to strand temperature.This Process is obtained relative to the thicker slab thickness of traditional sheet billet, is on the one hand improved single machine yield, is on the other hand added Operation of rolling overall reduction so that crystal grain further refines, and reaches the effect of refined crystalline strengthening.
(3) continuous casting billet is directly entered 3 frame roughing mills under 3-7m/min pulling rate and carries out roughing, and it is thick to form 14-16mm Middle base.This process is eliminated in traditional handicraft before roughing to the reheating link of strand, shortens technological process, is reduced Energy consumption, also obtains higher single machine yield.Due to faster pulling rate, during roughing entrance, 1200 DEG C of strand core temperature >, table About 1100 DEG C of face temperature, forms reverse Temperature Distribution pattern, can obtain higher convexity and wedge shape is adjusted so that strand core It is finer and close compared to traditional rolled products, further, since strand core temperature is high and softer, saved in the operation of rolling big The energy of amount.Three frame roughing mill single pass rolling reductions about 50%, big deflection causes original austenite grain to refine under high temperature, Organization foundation is provided for final uniform tiny ferritic structure.
(4) middle base thick 14-16mm successively by rocking shears, push away useless roller-way, after rotating hub is cut, into induction heater, After quick heating, middle base outlet temperature reaches 1155-1165 DEG C.This process accurately controls middle base essence and penetrates mouth temperature Degree, meet to prick temperature requirement eventually, temperature basis is provided for the rolling of Thin Specs.In addition, induction heater total length only has 10m, oxygen It is few to change iron sheet growing amount, reduces metal loss, and induction heater does not have energy expenditure during unloaded and maintenance, improves Efficiency of energy utilization, reduce production cost.
(5) the middle base after sensing heating passes through 40MPa high pressure descaling machines, and finger gauge is rolled into 5 frame finishing mills Lattice 2.5-3.0mm, width specifications 1500mm finished sheet base, it is 820-840 DEG C to prick temperature eventually.5 frame essence bundle machines are furnished with work Make roll bending system, load dynamic roll shifting system, working roll dynamic cooling system and long-range hydraulic AGC, fast response time, It is easy to dynamic to change specification realization.This process single pass rolling reduction about 30% so that original austenite grain is further refined as 12.5- 13.5 grades, refined crystalline strengthening effect is provided for the high intensity of final products.Low whole temperature of pricking can increase dislocation density, increase deformation Energy storage, the ferritic forming core speed of follow-up cooling procedure is improved, and prevent the Austenite Grain Growth after recrystallization.
(6) sheet billet passes through the laminar cooling system equipped with elevated tank after essence is pricked, and takes the intensive type of cooling of leading portion, cold Speed is up to 75%.Leading portion is intensive and the faster type of cooling increases the degree of supercooling of ferrite transformation so that phase transition process diffuses into Row is insufficient, and finally acquisition polygonal ferrite (PF), quasi-polygonal ferrite (QF), acicular ferrite (AF) coexist single-phase Ferritic structure, as shown in Figure 2.QF the and AF crystal boundaries formed because quick cooling is lower are not straight so that transcrystalline in deformation process Fracture transition is grain boundary fracture, increases crack expansion power, in addition, QF and AF intra-die dislocation densities are higher, adds position Deformation resistance is moved in Wrong Shipment.Therefore, this leading portion is intensive and the faster type of cooling, can improve final products by build up Intensity.
(7) sheet billet after section cooling carries out bundling by high-speed flying shear, and into downcoiler, coiling temperature is 560-620 DEG C, it is slowly cooled to room temperature after batching.Coordinate slow cooling after high temperature coiling, Ti, Nb, V nano-sized carbonitride can be made (as shown in Figure 3) fully is separated out, the intensity that steel is acted on by strong precipitation strength reaches design requirement.
According to the above-mentioned composition design based on ESP Endless Rolling Technologies production 700MPa level beam steels and technique side Method, the product mechanical property that the present invention obtains are:Yield strength > 600MPa, tensile strength 700-880MPa, elongation > 12.0%, yield tensile ratio < 0.94,180 ° of performances of clod wash are qualified, final products lumber recovery > 98%.In order to make to achievement of the present invention Further checking explanation, following table list 4 specific embodiments.Wherein, table 1 is the specific process parameter of embodiment;Table 2 is real Apply the result of implementation of example.
The technological parameter of the embodiment of the present invention of table 1
The result of implementation of the embodiment of the present invention of table 2
Present invention employs CSP Endless Rolling Technology, can either meet the strong automotive frame of Thin Specs superelevation The production technology demand of strip, realization " with Bao Daihou ", make Vehicle mass reduction, so as to increase the effective mounted mass of automobile, drop Low burn oil consumption, conevying efficiency is improved, and can enough shortens technological process, improves the surface quality of hot rolled strip, reduces hot-rolled strip The thickness specification of steel, realize " with hot Dai Leng ", so as to improve production efficiency, production cost is reduced, while reduces energy consumption, the row of reduction Put, reach resources conservation, environmentally friendly production.
Although having been presented for several embodiments of the present invention herein, it will be appreciated by those of skill in the art that Without departing from the spirit of the invention, the embodiments herein can be changed.Above-described embodiment be it is exemplary, no Restriction that should be using the embodiments herein as interest field of the present invention.

Claims (10)

1. a kind of preparation method of 700MPa levels automotive frame steel band, it is characterised in that the preparation method uses endless rolling Technology;Continuous casting billet is directly entered roughing mills without reheating;Middle base finish rolling entrance is accurately controlled by sensing heating Temperature;Whole process has strip to be joined directly together in addition to batching, and production process is without threading and throws steel.
2. preparation method as claimed in claim 1, it is characterised in that specific steps are cold including continuous casting, roughing, finish rolling, laminar flow But, batch.
3. preparation method as claimed in claim 1, it is characterised in that the raw material of the 700MPa levels automotive frame steel band Chemical composition is respectively by mass percentage:C 0.04-0.06%;Si 0.10-0.40%;Mn 1.60-1.70%;Als 0.02-0.04%;Ti 0.05-0.07%;Nb 0.03-0.07%;V 0.04-0.07%;P≤0.015%;S≤0.006;N ≤ 0.0050, remaining is iron and inevitable impurity.
4. preparation method as claimed in claim 1, it is characterised in that the product specification of the 700MPa levels automotive frame steel band For 2.5-3.0mm × 1500mm, single-phase ferrite is organized as, grain size is 12.5-13.5 levels, yield strength > 600MPa, is resisted Tensile strength is 700-880MPa, elongation > 12.0%, yield tensile ratio < 0.94, and 180 ° of performances of clod wash are qualified, and final products are become a useful person Rate > 98%.
5. preparation method as claimed in claim 1, it is characterised in that thickness of strand 80-100mm, pulling rate 3-7m/min, Maximum molten steel flow 6.5t/min.
6. preparation method as claimed in claim 5, it is characterised in that into 1200 DEG C of the strand core temperature > of roughing mill, 1100 ± 100 DEG C of surface temperature, form reverse Temperature Distribution pattern;Roughing single pass rolling reduction 50%, form 14-16mm thickness Middle base.
7. preparation method as claimed in claim 6, it is characterised in that the maximum heating of sensing heating is 300 DEG C before essence is pricked, middle The sensed temperature after heating of base is 1155-1165 DEG C, and finishing temperature is 820-840 DEG C.
8. preparation method as claimed in claim 1, it is characterised in that molten iron passes through BOF converter smeltings successively, LF stoves refine, Molten steel is formed after the refining of RH stoves, tundish temperature is 1540-1550 DEG C, and degree of supercooling is 20-30 DEG C.
9. the preparation method as described in claim any one of 1-8, it is characterised in that conticaster is provided with electro-magnetic braking functions Funnel-form crystallizer and expert system, possess dynamic and adjust wide and breakout prediction function, bending section is furnished with wick-containing press function, can be excellent Change crystallizer flow field, fan-shaped section is furnished with slighter compress function, can mitigate center porosity and segregation, and cooling system possesses dynamic water allocation work( Can, the hot resume of online strand are monitored in real time, it is accurate to control strand temperature.
10. application of the preparation method as described in claim any one of 1-9 on ESP production lines, it is characterised in that described ESP production lines are endless rolling production line, total length 190m, and molten steel lasts 7min from conticaster to coiling machine.
CN201710702680.5A 2017-08-16 2017-08-16 A kind of preparation method of 700MPa levels automotive frame steel band Pending CN107604256A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109023109A (en) * 2018-09-26 2018-12-18 武汉钢铁有限公司 Using the 700MPa grade thin gauge Hot Rolling Automobile structural steel and method of short route production
CN109112422A (en) * 2018-08-30 2019-01-01 宝山钢铁股份有限公司 A kind of 780MPa grades high tired high-strength steel and its manufacturing method

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Publication number Priority date Publication date Assignee Title
CN106756560A (en) * 2016-12-30 2017-05-31 日照宝华新材料有限公司 The method that Thin Specs RE700L steel is produced based on ESP bar strip continuous casting and rolling flow paths
CN106834887A (en) * 2016-12-30 2017-06-13 日照宝华新材料有限公司 The method that Thin Specs RE510L steel is produced based on ESP bar strip continuous casting and rolling flow paths

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106756560A (en) * 2016-12-30 2017-05-31 日照宝华新材料有限公司 The method that Thin Specs RE700L steel is produced based on ESP bar strip continuous casting and rolling flow paths
CN106834887A (en) * 2016-12-30 2017-06-13 日照宝华新材料有限公司 The method that Thin Specs RE510L steel is produced based on ESP bar strip continuous casting and rolling flow paths

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109112422A (en) * 2018-08-30 2019-01-01 宝山钢铁股份有限公司 A kind of 780MPa grades high tired high-strength steel and its manufacturing method
CN109023109A (en) * 2018-09-26 2018-12-18 武汉钢铁有限公司 Using the 700MPa grade thin gauge Hot Rolling Automobile structural steel and method of short route production

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