CN107641762A - 340MPa levels have the Hot Rolling Automobile structural steel and iron and manufacture method of excellent cold forming capability - Google Patents
340MPa levels have the Hot Rolling Automobile structural steel and iron and manufacture method of excellent cold forming capability Download PDFInfo
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Abstract
The invention discloses a kind of 340MPa levels to have excellent cold forming capability Hot Rolling Automobile structural steel and iron and manufacture method, and the chemical element component and its percentage by weight contained is：Carbon 0.03~0.06%, manganese 0.4~0.6%, niobium 0.008~0.020%, titanium 0.008~0.020%, silicon ＜ 0.10%, sulphur≤0.005%, phosphorus≤0.025%, nitrogen≤40ppm, dissolved aluminum 0.025~0.050%, surplus are iron and inevitable impurity.Nb Ti micro-alloying technologies are used in short route, S, the N (S≤0.005%, N≤40ppm) fixed using trace Ti in steel, Nb fine grain effect is given full play to, obtain tiny F+P tissues, while obtaining higher-strength, improve the cold forming capability of steel grade.
Description
Technical field
The invention belongs to steel hot rolled strip production technical field, and in particular to a kind of 340MPa levels have excellent cold forming
The Hot Rolling Automobile structural steel and iron and manufacture method of performance.
Background technology
In recent years, Domestic Automotive Industry is grown continuously and fast, and tremendous influence is brought to social energy resource supply and environmental protection.
With the increase of environmental protection pressure, the country promulgates a series of programmatic documents successively, and green should be accelerated by explicitly pointing out China's manufacturing industry
Manufacture, the transition paces of ecodevelopment.Now there are some researches show lightweight is to realize the most effective measure of automotive energy-saving emission-reducing, steel
The high strengthening of iron material is the important technology path of automobile lightweight.Greenization, high performance turn into automobile using steel
The development trend of material.
Traditional vehicle structure steel, the particularly following products of thickness 2.0mm use the manufacturing process of hot rolling+cold rolling, its
Manufacturing process length, complex procedures, high energy consumption, face the challenge from automobile industry green manufacturing and cost.Therefore how to develop
Go out greenization, low cost, the new automobile structural steel and iron of Thin Specs become one brand-new problem of steel industry.
At present, the patent on 340MPa level low alloy high-strength steel is more.Such as：Publication number CN1641059A Chinese patent
A kind of low-alloy high-strength steel and its manufacture method are provided, which are added tri- kinds of alloys of Nb, V and Ti, its content is respectively
0.015~0.025%Nb, 0.025~0.035%V, 0.010~0.020%Ti；And Mn contents are up to more than 1.3%, bend
Intensity is taken also to only require as more than 325MPa, elongation percentage more than 22%.Publication number CN1920081A Chinese patent application provides
A kind of Hi-Stren steel, not only Mn contents are 1.25~1.75% for it, also added Mo alloys costly.It is open
Number CN101768699A Chinese patent application provides a kind of low alloy high strength steel strip and its production method, wherein also adding
Expensive Mo and Cr alloys.Publication number CN102534368A Chinese patent, it is wide that application provides a kind of low-alloy high-strength
Sheet metal and its production method, wherein requiring that Mn contents are 1.4~1.6%, V content is 0.34~0.36%.Existing low conjunction
The steel grade of golden high-strength steel can add alloying component costly in actual production process, so as to cause its cost high, economical
Benefit is low.The Chinese patent " low-alloy high-strength steel galvanized sheet and its production method " of Application No. 201410036071.7, its steel
The quality proportioning of kind of chemical composition is：C：0.04~0.07%；Si≤0.03%；Mn0.3~0.4%, P≤0.015%, S≤
0.012%, Als0.020~0.045%, N≤0.0050%, surplus Fe, by optimizing composition design, while corresponding adjustment
Hot rolling, cold rolling and zinc-plated process technological parameter, addition content only have 0.3~0.4% cheap Mn alloys, do not add it is any its
He produces 260~355MPa of yield strength low-alloy high-strength galvanized sheet in the case of alloying element, and elongation percentage reaches
More than 28%.The product of all of above patent production, the technological process generally used for：Pneumatic steelmaking-hot rolling-pickling and cold-rolling-
Zinc-plated etc., production procedure length, cost is high, and product does not have stronger competitiveness.And short route is fitted due to the characteristics of producing line is arranged
1.0~3.0mm thin slab product is produced in symphysis, saves follow-up cold rolling, annealing operation, reduces cost, improves product competitiveness.By
It is that mould is cold stamping shaped in Thin Specs Automobile Plate molding mode, material cold forming capability difference easily causes stamping cracking, it is desirable to
Hot rolled thin gauge material has excellent cold forming capability.Therefore, excellent cold forming is had based on short route production 340MPa levels
The Thin Specs Hot Rolling Automobile structural steel and iron of performance is one of this area technological difficulties urgently to be resolved hurrily.
The content of the invention
Present invention aim to provide a kind of 340MPa levels to have the Hot Rolling Automobile structural steel of excellent cold forming capability
Plate and manufacture method, can produce yield strength 340MPa level Thin Specs hot-rolled products, and thickness and precision is controlled within 20 μm, added
Work hardening ratio n >=0.19, there is good cold forming capability.
To achieve the above object, the technical solution adopted by the present invention is：340MPa level Hot Rolling Automobile structural steel and irons, contain
Chemical element component and its percentage by weight are：Carbon 0.03~0.06%, manganese 0.4~0.6%, niobium 0.008~0.020%, titanium
0.008~0.020%, silicon ＜ 0.10%, sulphur≤0.005%, phosphorus≤0.025%, nitrogen≤40ppm, dissolved aluminum 0.025~
0.050%, surplus is iron and inevitable impurity.
" with hot Dai Leng ", meet the requirement of auto parts and components, to the field trash and surface quality in steel for realize steel grade
There are strict requirements, the composition design thinking with reference to short route using the Nb-Ti microalloys of " low silicon, low manganese ", redesign into
Split system.
The percentage by weight of the carbon is 0.04~0.055%.
Si (silicon)：There is very strong solution strengthening effect, but be first oxidized to SiO under the high temperature conditions2, then SiO2With
FeO in oxide layer reacts to form fayalite phase (Fe2SiO4), easily it is enriched at the faying face of iron scale and matrix, once
Continuous Fe is formed between iron scale and matrix2SiO4Layer, plays " pinning " to iron scale, is made in the operation of rolling
Into scale defect, deteriorate the surface quality of hot rolled steel plate, increase the roughness of iron scale and basal body interface, so, it is right
Si is strictly limited, and its content is limited to<Within the scope of 0.10%.
Mn (manganese)：Solution strengthening element, oxide under the high temperature conditions is similar to Fe oxide, there is MnO, Mn3O4、
Mn2O3Etc. several oxides, and oxide corresponding with Fe has very high mutual solubility.When Mn contents are higher, easily generation
(FeMn)2SiO4, easily it is enriched with the faying face of iron scale and matrix, causes coarse, the shape of iron scale and basal body interface
The defects of into iron scale class, so its content is limited into 0.4~0.6%, preferably 0.43~0.50%.
Ti (titanium)：Crystal grain thinning, a small amount of Ti is added, for fixing free N, S in molten steel, improve the weldability of steel grade
Can, so its content is limited into 0.008~0.020%, preferably 0.010~0.018%.
Nb (niobium)：Crystal grain thinning, refined crystalline strengthening effect is played, but the problem of Nb raising austenite recrystallizations, easily drawn
The mixed grain structure in steel is played, so its content is limited into 0.008~0.020%, preferably 0.010~0.018%.
A kind of 340MPa levels as described above have the manufacture method of the Hot Rolling Automobile structural steel and iron of excellent cold forming capability,
Comprise the following steps：
1) smelt
Molten steel is formed by the composition and percentage by weight are well mixed, using deep desulfurization pretreatment-converter refining during smelting
Steel-LF-RH (or without RH) technique；
Desulfurizing iron pre-processing requirements S：≤ 0.005%, converter molten steel smelting requirements C >=0.03%, tapping temperature exists
1660~1690 DEG C；Deoxidation, slag making in LF stoves, temperature >=1620 DEG C leaving from station；Molten steel enter RH stoves in, carry out decarburization, deoxidation,
Nb-Ti alloys are added, after alloy has added, circulation >=8min carries out brokenly sky, Argon >=5min again；
2) Calcium treatment
Carry out Calcium treatment and change slag, N controls≤40ppm, Als control is 0.025~0.050%, tapping temperature 1570
~1590 DEG C；
3) continuous casting
Continuous casting casting speed is 4.0~6m/min, slab thickness is that 50~150mm forms continuous-casting sheet billet；Strand is two
Cold water section uses edge weak cold system, and control cooling water inflow ensures that continuous-casting sheet billet enters Soaking Pit Temperature at 900~1100 DEG C, subtracted
Few strand edge cracks；
4) continuous-casting sheet billet soaking
After continuous-casting sheet billet enters soaking pit, time inside furnace is 20~40min, and tapping temperature is 1150~1230 DEG C；
5) de-scaling
Continuous-casting sheet billet carries out high-pressure water descaling before going out soaking pit feed mill, descaling header >=2 group, control de-scaling hydraulic pressure
Power is 280~320bar；
6) roll
It is 1120~1180 DEG C that continuous-casting sheet billet, which enters rolling mill temperature, the percentage pass reduction of finishing rolling control first, the second passage pressure
Lower rate, the 3rd percentage pass reduction are >=50%；Recrystallization fully occurs for austenite in the operation of rolling deformation condition is provided, eliminate
Mixed crystal in tissue, it is 820~880 DEG C to control finishing temperature；
7) cool down
Coil of strip uses leading portion rapid cooling technique after rolling, and laminar flow medium temperature is 680~720 DEG C, and oiler temperature control is 560
~620 DEG C；
8) it is smooth
Coil of strip progress is smooth, and smooth power is 150~180 tons, eliminates yield point elongation.
Compared with prior art, the present invention has advantages below：
1) present invention is to use Nb-Ti micro-alloying technologies in short route, using trace Ti fix steel in S, N (S≤
0.005%th, N≤40ppm), Nb fine grain effect is given full play to, obtains tiny F+P tissues, while obtaining higher-strength,
Improve the cold forming capability of steel grade；
2) brand-new component system is used in short route producing line, produces yield strength 340MPa level Thin Specs Hot Rolling Automobiles
Structural steel and iron, is organized as fine ferrite and pearlite, and grain size is 10~11 grades, does not occur mixed grain structure, and thickness is 1.0~
3.0mm, the yield strength of steel is in 340~420MPa, 410~510MPa of tensile strength, elongation percentage A80 >=21%, processing hardening
Rate n >=0.19, thickness and precision is controlled within 20 μm, suitable with the cold-rolled products forming ability of same intensity rank, is had good
Good cold forming capability, while during its horizontal 180 DEG C of cold bending experiment of sample of progress, specimen width 35mm, Bend diameter d=0.5a
(d Bend diameters, a sample thickness), the mechanical property and processability of product are suitable with the cold-rolled products of same intensity rank, energy
Cold rolling material is enough substituted, reduces cost, improves the competitiveness of product；
3) present invention is based on short route producing line, and flow is brief efficiently, energy-conserving and environment-protective, is suitable for the thin of 1.0~3.0mm of production
Size hot-rolled vehicle structure steel plate, can substitute traditional cold-rolled products, save cold rolling, the annealing operation of complexity, significantly contract
Short manufacturing process, reduce manufacturing cost, reduce energy consumption water consume and all kinds of waste discharges, meeting automobile industry green manufacturing and low
The demand of cost；
4) present invention gives full play to the characteristics of short route operation of rolling temperature is uniform, can produce yield strength 340MPa levels
Thin Specs hot-rolled product, stable performance, fluctuation is small, and the fluctuation range of yield strength and tensile strength is controlled within 30MPa, energy
Enough meet the standard requirement of same intensity rank cold-rolled products, cold-rolled products can be substituted.
Brief description of the drawings
Fig. 1 is the forming limit diagram for the Hot Rolling Automobile structural steel and iron that 340MPa levels of the present invention have excellent cold forming capability.
Embodiment
With reference to embodiment, the present invention is described in further detail, is easy to more clearly understand the present invention, but it
Not to the present invention form limit.
Embodiment 1
The present embodiment 340MPa levels have the Hot Rolling Automobile structural steel and iron of excellent cold forming capability, using " low-carbon, low silicon,
The Nb-Ti microalloy component systems of low manganese " are produced, and each element chemical composition mass percent wt% controls are as follows：C：
0.04%, Si：≤ 0.06%, Mn：0.43%, S：≤ 0.005%, P：≤ 0.025%, Nb：0.010%, Ti：0.015%, N：
≤ 40ppm, Als：0.025~0.050%；
Its manufacture method comprises the following steps：
1) smelt
Molten steel is formed by the composition and percentage by weight are well mixed, using deep desulfurization pretreatment-converter refining during smelting
Steel-LF-RH techniques；
Desulfurizing iron pre-processing requirements S≤0.005%, converter molten steel smelting requirements C are 0.04%, and tapping temperature is 1680
℃；Deoxidation, slag making in LF stoves, temperature >=1640 DEG C leaving from station；Molten steel enters in RH stoves, carries out decarburization, deoxidation, addition Nb-Ti
Alloy, after alloy has added, circulation >=8min carries out brokenly sky, Argon >=5min again；
2) Calcium treatment
Carry out Calcium treatment and change slag, N controls≤40ppm, Als control is 0.025~0.050%, tapping temperature 1580
℃；
3) continuous casting
Continuous casting casting speed is 4.3m/min, slab thickness is that 50mm forms continuous-casting sheet billet；Strand is adopted in secondary cooling water section
With edge weak cold system, control cooling water inflow ensures that continuous-casting sheet billet enters Soaking Pit Temperature at 950 DEG C, reduces strand edge and splits
Line；
4) continuous-casting sheet billet soaking
After continuous-casting sheet billet enters soaking pit, time inside furnace 25min, tapping temperature is 1180 DEG C；
5) de-scaling
Continuous-casting sheet billet carries out high-pressure water descaling before going out soaking pit feed mill, descaling header >=2 group, control de-scaling hydraulic pressure
Power is 300bar；
6) roll
Continuous-casting sheet billet enters rolling mill temperature for 1140 DEG C, the percentage pass reduction of finishing rolling control first, the second percentage pass reduction, the
Three percentage pass reductions are respectively 51%, 53%, 52%；Recrystallization fully occurs for austenite in the operation of rolling modified strip is provided
Part, the mixed crystal in tissue is eliminated, it is 820~880 DEG C to control finishing temperature；
7) cool down
Coil of strip uses leading portion rapid cooling technique after rolling, and laminar flow medium temperature is 680~720 DEG C, and oiler temperature control is 560
~620 DEG C；
8) it is smooth
Coil of strip progress is smooth, and smooth power is 150~180 tons, eliminates yield point elongation.
According to the component system of the present embodiment, the tissue, mechanics and work hardening rate for producing product are as shown in table 1.
Table 1 is tissue, mechanical property and the work hardening rate of the steel plate of embodiment 1
As table 1 and Fig. 1 can be seen that the yield strength 340MPa level Thin Specs Hot Rolling Automobile structural steel of the present embodiment production
Plate, performance meet the cold-rolled products standard requirement of same intensity rank, while work hardening rate n >=0.19, forming property with it is cold
Roll that product is suitable, there is excellent cold formability energy, during curved footpath d=0.5a, 180 ° of clod wash is qualified.
Embodiment 2
The present embodiment 340MPa levels have the Hot Rolling Automobile structural steel and iron of excellent cold forming capability, using " low-carbon, low silicon,
The Nb-Ti microalloy component systems of low manganese " are produced, and each element chemical composition mass percent wt% controls are as follows：C：
0.045%, Si：≤ 0.08%, Mn：0.45%, S：≤ 0.004%, P：≤ 0.025%, Nb：0.013%, Ti：0.014%,
N：≤ 40ppm, Als：0.025~0.050%；
Its manufacture method comprises the following steps：
1) smelt
Molten steel is formed by the composition and percentage by weight are well mixed, using deep desulfurization pretreatment-converter refining during smelting
Steel-LF-RH techniques；
Desulfurizing iron pre-processing requirements S：≤ 0.004%, converter molten steel smelting requirements C are 0.045%, and tapping temperature exists
1690℃；Deoxidation, slag making in LF stoves, temperature >=1650 DEG C leaving from station；Molten steel enters in RH stoves, carries out decarburization, deoxidation, addition
Nb-Ti alloys, after alloy has added, circulation >=8min carries out brokenly sky, Argon >=5min again；
2) Calcium treatment
Carry out Calcium treatment and change slag, N controls≤40ppm, Als control is 0.025~0.050%, tapping temperature 1590
℃；
3) continuous casting
Continuous casting casting speed is 4.5m/min, slab thickness is that 55mm forms continuous-casting sheet billet；Strand is adopted in secondary cooling water section
With edge weak cold system, control cooling water inflow ensures that continuous-casting sheet billet enters Soaking Pit Temperature at 980 DEG C, reduces strand edge and splits
Line；
4) continuous-casting sheet billet soaking
After continuous-casting sheet billet enters soaking pit, time inside furnace 30min, tapping temperature is 1200 DEG C；
5) de-scaling
Continuous-casting sheet billet carries out high-pressure water descaling before going out soaking pit feed mill, descaling header >=2 group, control de-scaling hydraulic pressure
Power is 320bar；
6) roll
Continuous-casting sheet billet enters rolling mill temperature for 1160 DEG C, the percentage pass reduction of finishing rolling control first, the second percentage pass reduction, the
Three percentage pass reductions are respectively 52%, 53%, 51%；Recrystallization fully occurs for austenite in the operation of rolling modified strip is provided
Part, the mixed crystal in tissue is eliminated, it is 820~880 DEG C to control finishing temperature；
7) cool down
Coil of strip uses leading portion rapid cooling technique after rolling, and laminar flow medium temperature is 680~720 DEG C, and oiler temperature control is 560
~620 DEG C；
8) it is smooth
Coil of strip progress is smooth, and smooth power is 150~180 tons, eliminates yield point elongation.
According to the component system of the present embodiment, the tissue, mechanics and work hardening rate for producing product are as shown in table 2.
Table 2 is tissue, mechanical property and the work hardening rate of the steel plate of embodiment 2
As table 2 and Fig. 1 can be seen that the yield strength 340MPa level Thin Specs Hot Rolling Automobile structures of the inventive method production
Steel, performance meet the cold-rolled products standard requirement of same intensity rank, while work hardening rate n >=0.19, forming property with it is cold
Roll that product is suitable, there is excellent cold formability energy, during curved footpath d=0.5a, 180 ° of clod wash is qualified.
Embodiment 3
The present embodiment 340MPa levels have the Hot Rolling Automobile structural steel and iron of excellent cold forming capability, using " low-carbon, low silicon,
The Nb-Ti microalloy component systems of low manganese " are produced, and each element chemical composition mass percent wt% controls are as follows：C：
0.055%, Si：≤ 0.08%, Mn：0.50%, S：≤ 0.003%, P：≤ 0.025%, Nb：0.016%, Ti：0.017%,
N：≤ 40ppm, Als：0.025~0.050%；
Its manufacture method comprises the following steps：
1) smelt
Molten steel is formed by the composition and percentage by weight are well mixed, using deep desulfurization pretreatment-converter refining during smelting
Steel-LF-RH techniques；
Desulfurizing iron pre-processing requirements S：≤ 0.003%, converter molten steel smelting requirements C are 0.055%, and tapping temperature exists
1670℃；Deoxidation, slag making in LF stoves, temperature >=1640 DEG C leaving from station；Molten steel enters in RH stoves, carries out decarburization, deoxidation, addition
Nb-Ti alloys, after alloy has added, circulation >=8min carries out brokenly sky, Argon >=5min again；
2) Calcium treatment
Carry out Calcium treatment and change slag, N controls≤40ppm, Als control is 0.025~0.050%, tapping temperature 1570
℃；
3) continuous casting
Continuous casting casting speed is 5.0m/min, slab thickness is that 60mm forms continuous-casting sheet billet；Strand is adopted in secondary cooling water section
With edge weak cold system, control cooling water inflow ensures that continuous-casting sheet billet enters Soaking Pit Temperature at 980 DEG C, reduces strand edge and splits
Line；
4) continuous-casting sheet billet soaking
After continuous-casting sheet billet enters soaking pit, time inside furnace 30min, tapping temperature is 1230 DEG C；
5) de-scaling
Continuous-casting sheet billet carries out high-pressure water descaling before going out soaking pit feed mill, descaling header >=2 group, control de-scaling hydraulic pressure
Power is 320bar；
6) roll
Continuous-casting sheet billet enters rolling mill temperature for 1170 DEG C, the percentage pass reduction of finishing rolling control first, the second percentage pass reduction and
3rd percentage pass reduction is respectively 53%, 53%, 52%；Recrystallization fully occurs for austenite in the operation of rolling modified strip is provided
Part, the mixed crystal in tissue is eliminated, it is 820~880 DEG C to control finishing temperature；
7) cool down
Coil of strip uses leading portion rapid cooling technique after rolling, and laminar flow medium temperature is 680~720 DEG C, and oiler temperature control is 560
~620 DEG C；
8) it is smooth
Coil of strip progress is smooth, and smooth power is 150~180 tons, eliminates yield point elongation.
According to the component system of the present embodiment, the tissue, mechanics and work hardening rate for producing product are as shown in table 2.
Table 3 is tissue, mechanical property and the work hardening rate of the steel plate of embodiment 3
As table 3 and Fig. 1 can be seen that yield strength 340MPa 1.0~3.0mm of level Thin Specs heat of the inventive method production
Vehicle structure steel plate is rolled, performance meets the cold-rolled products standard requirement of same intensity rank, while work hardening rate n >=0.19,
Forming property is suitable with cold-rolled products, has an excellent cold formability energy, and during curved footpath d=0.5a, 180 ° of clod wash is qualified.
Claims (7)
1. a kind of 340MPa levels have the Hot Rolling Automobile structural steel and iron of excellent cold forming capability, it is characterised in that：The chemistry contained
Elemental composition and its percentage by weight are：Carbon 0.03~0.06%, manganese 0.4~0.6%, niobium 0.008~0.020%, titanium 0.008
~0.020%, silicon ＜ 0.10%, sulphur≤0.005%, phosphorus≤0.025%, nitrogen≤40ppm, dissolved aluminum 0.025~0.050%,
Surplus is iron and inevitable impurity.
2. 340MPa levels have the Hot Rolling Automobile structural steel and iron of excellent cold forming capability according to claim 1, its feature exists
In：The percentage by weight of the carbon is 0.04~0.055%.
3. 340MPa levels have the Hot Rolling Automobile structural steel and iron of excellent cold forming capability according to claim 1, its feature exists
In：The percentage by weight of the manganese is 0.43~0.50%.
4. 340MPa levels have the Hot Rolling Automobile structural steel and iron of excellent cold forming capability according to claim 1, its feature exists
In：The percentage by weight of the niobium is 0.01~0.018%.
5. 340MPa levels have the Hot Rolling Automobile structural steel and iron of excellent cold forming capability according to claim 1, its feature exists
In：The percentage by weight of the titanium is 0.010~0.018%.
6. a kind of 340MPa levels as claimed in claim 1 have the manufacturer of the Hot Rolling Automobile structural steel and iron of excellent cold forming capability
Method, it is characterised in that：Comprise the following steps：
1) smelt
Form molten steel by the composition and percentage by weight are well mixed, during smelting using deep desulfurization pretreatment-pneumatic steelmaking-
LF-RH techniques；
2) Calcium treatment
Carry out Calcium treatment and change slag, N controls≤40ppm, Als control 0.025~0.050%, tapping temperature is 1570~
1590℃；
3) continuous casting
Continuous casting casting speed is 4.0~6m/min, slab thickness is that 50~150mm forms continuous-casting sheet billet；Strand is in secondary cooling water
Duan Caiyong edge weak cold systems, control cooling water inflow ensure that continuous-casting sheet billet enters Soaking Pit Temperature at 900~1100 DEG C；
4) continuous-casting sheet billet soaking
After continuous-casting sheet billet enters soaking pit, time inside furnace is 20~40min, and tapping temperature is 1150~1230 DEG C；
5) de-scaling
Continuous-casting sheet billet carries out high-pressure water descaling before going out soaking pit feed mill, and it is 280~320bar to control de-scaling water pressure；
6) roll
It is 1120~1180 DEG C that continuous-casting sheet billet, which enters rolling mill temperature, the percentage pass reduction of finishing rolling control first, the second percentage pass reduction
And the 3rd percentage pass reduction >=50%, and control finishing temperature as 820~880 DEG C；
7) cool down
Coil of strip uses leading portion rapid cooling technique after rolling, and laminar flow medium temperature is 680~720 DEG C, oiler temperature control 560~
620℃；
8) it is smooth
Coil of strip progress is smooth, and smooth power is 150~180 tons.
7. 340MPa levels have the manufacturer of the Hot Rolling Automobile structural steel and iron of excellent cold forming capability according to claim 6
Method, it is characterised in that：In the step 1), molten steel is formed by the composition and percentage by weight are well mixed, is used during smelting
Deep desulfurization pretreatment-pneumatic steelmaking-LF techniques.
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| CN201710882621.0A CN107641762B (en) | 2017-09-26 | 2017-09-26 | 340 MPa-grade hot-rolled automobile structural steel plate with excellent cold formability and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109680123A (en) * | 2019-02-19 | 2019-04-26 | 河钢股份有限公司承德分公司 | A kind of automobile titanium steel containing vanadium alloying smelting process |
| WO2020030040A1 (en) * | 2018-08-08 | 2020-02-13 | Jiangsu Shagang Group Co., Ltd. | Production of twin-roll cast and hot rolled steel strip |
| CN112011732A (en) * | 2020-07-31 | 2020-12-01 | 马鞍山钢铁股份有限公司 | DDQ-grade hot-rolled pickling cold-formed steel and manufacturing method thereof |
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