CN106756563A - Tensile strength 800MPa grades of Ultra-thin broad hot strip and production method - Google Patents
Tensile strength 800MPa grades of Ultra-thin broad hot strip and production method Download PDFInfo
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- CN106756563A CN106756563A CN201710016079.0A CN201710016079A CN106756563A CN 106756563 A CN106756563 A CN 106756563A CN 201710016079 A CN201710016079 A CN 201710016079A CN 106756563 A CN106756563 A CN 106756563A
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing 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
- 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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- 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
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a kind of tensile strength 800MPa grades of Ultra-thin broad hot strip and production method, roll broadband steel chemical composition composition and percentage by weight is：C：0.06~0.10%, Si≤0.30%, Mn：1.60~2.00%, P≤0.020%, S≤0.015%, Nb：0.030~0.060%, V：0.04~0.06, Ti：0.09~0.13%, Als：0.010~0.060%, balance of Fe and inevitable impurity element.Production method comprises the steps：Converter smelting, LF refining, RH refinings, sheet billet continuous casting, heating of plate blank, high-pressure water descaling, controlled rolling, controlled rolling are cooled down, batched.Broad hot strip yield strength >=700MPa for being produced of the present invention, tensile strength >=800MPa, elongation percentage >=12% is organized as accounting for 95% ferrite, and about 5% pearlite.Compared with traditional handicraft, Downstream processing user saves cost of material to the present invention, saves process time, reduces the production cycle.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to a kind of tensile strength 800MPa grades of Ultra-thin broad hot strip
And production method.
Background technology
Consider for member dead weight, reduction rolled steel dosage, reduction production cost factor is reduced with downstream user, Yi Jiguo
Family is progressively increased to the protection of resource environment, and high intensity, the demand of thin gauge strip are increased sharply, but for conventional heat
Tandem mill production belt steel thickness specification is thinned to certain thickness（1.5-2.0mm）, it is very difficult, on the basis of Thin Specs,
It is required that realizing high intensity（Tensile strength >=800MPa）, it is domestic at present not yet to realize, it is former using continuous hot-rolling mill production hot rolling
Expect, be machined to expectation thickness specification through cold rolling（1.5-2.0mm）, quenching-and-tempering process will to reach desired mechanical property
Ask.
1.5-2.0mm is reached as continuous hot-rolling mill can produce thickness specification, while tensile strength realization >=800MPa is wide
Strip, will save a large amount of costs of material for Downstream processing using user, while saving process time, reduce the production cycle, be this
The problem of industry urgent need to resolve.
The content of the invention
It is an object of the invention to provide a kind of tensile strength 800MPa grades of Ultra-thin broad hot strip and production method.
The thickness specification of the specific broad hot strip of the reinforcing bar reduces to 1.5-2.0mm, tensile strength of mechanical property >=800MPa, yield strength
>=700MPa, elongation percentage >=12%.
In order to solve the above technical problems, the present invention uses following technical proposals：A kind of tensile strength 800MPa grades of very thin rule
Lattice broad hot strip, it is described to roll broadband steel chemical composition composition and percentage by weight is：C：0.06~0.10%, Si≤0.30%,
Mn：1.60~2.00%, P≤0.020%, S≤0.015%, Nb：0.030~0.060%, V：0.04~0.06%, Ti：0.09~
0.13%, Als：0.010~0.060%, balance of Fe and inevitable impurity element.
Broad hot strip thickness of the present invention is 1.5~2.0mm.
Broad hot strip tensile strength of mechanical property >=800MPa of the present invention, yield strength >=700MPa, elongation percentage
≥12%。
The present invention also provides a kind of production method of above-mentioned tensile strength 800MPa grades of Ultra-thin broad hot strip, including
Following step：Converter smelting, LF refining, RH refinings, sheet billet continuous casting, heating of plate blank, high-pressure water descaling, controlled rolling, controlled rolling are cold
But, batch；The sheet billet continuous casting operation, the Chemical Composition in Cast Billet chemical composition composition and percentage by weight are：C：0.06~
0.10%, Si≤0.30%, Mn：1.60~2.00%, P≤0.020%, S≤0.015%, Nb：0.030~0.060%, V：0.04~
0.06%, Ti：0.09~0.13%, Als：0.010~0.060%, balance of Fe and inevitable impurity element.
Controlled rolling operation of the present invention, controlled rolling is batched including roughing, Coil Box, finish rolling.
Controlled rolling operation of the present invention, after roughing is rolled through 5 roads, outlet temperature is 1050~1150 DEG C.
Controlled rolling operation of the present invention, entry temperature at finishing be 1000~1100 DEG C, exit temperature at finishing be 860~
920℃。
Heating of plate blank operation of the present invention, by heating of plate blank to 1200~1300 DEG C.
Controlled rolling operation of the present invention, de-scaling water comes into operation between two rolling mill frames before finish rolling, de-scaling pressure >=
10MPa。
Control refrigerating work procedure of the present invention, section cooling speed >=20 DEG C/S, 550~650 DEG C of coiling temperature.
Chemical constituent mentality of designing of the present invention：
C：0.06~0.10%, relatively low carbon content can make the steel have a good weldability and cold formability, and intensity can not lead to completely
Microalloying and cooling controlling and rolling controlling process is crossed to make up；
Mn：1.6~2.0%, Mn improve the intensity of steel by solution strengthening, while considering two aspect factors, carbon are promoted first
Dissolving of the nitride precipitated phase in heating, suppresses precipitation of the precipitated phase in rolling, is conducive to keeping more precipitation
Element is separated out in the cooling procedure after rolling in ferrite, strengthens precipitation strength, and Mn can also expand austenite phase field, drop
The transition temperature of low overcooling austenite phase, is conducive to the refinement of phase-change organization, secondly while to be rolled during reduction belt steel rolling
Machine load, it is ensured that rolling stability, and ensure belt plate shape quality, schedule of reinforcement is mainly with the phase transformation strengthening of roller repairing process
Based on precipitation strength, the content based on this determination element M n.
P：≤ 0.020%, low phosphorus content can make the steel have good toughness, cold formability and weldability.
S：≤ 0.015%, low sulfur content makes steel have preferable toughness and cold formability.
Nb：0.030~0.060%, the intensity of steel is improved by refined crystalline strengthening and precipitation strength, Nb can improve austenite
Recrystallization temperature, i.e., realize the non-recrystallization zone rolling of austenite, so as to rolled piece can be made in temperature higher at a higher temperature
Lower completion rolling deformation, while obtaining tiny phase-change organization.This outer portion Nb is separated out in ferrite area, reinforced ferrite base
Body.
Ti：0.09~0.13%, processed using titanium, austenite when the not molten Ti of high temperature (C, N) can effectively prevent high-temperature heating
The roughening of crystal grain, separates out in rolling, can produce strong precipitating reinforcing effect while preventing crystal grain from growing up, while
When being welded to material, the performance of heat affected area is can obviously improve.
V：0.04~0.06%, strengthened using vanadium, by the precipitation of V.N and V.C, strong precipitation strength effect is realized, carry
The intensity of Gao Gang.
Als：0.010~0.060%, Al are the deoxidiers commonly used in steel.A small amount of aluminium is added in steel, can crystal grain thinning, carry
High impact toughness.Al also has inoxidizability and corrosion resistance, and aluminium silicon is shared, and is remarkably improved the high temperature non-scale performance of steel
With the ability of high-temperature corrosion resistance.But hot-working character, welding performance and the machinability of steel will be influenceed when Al exceedes a certain amount of
Energy.
Process design thinking of the present invention：In production method of the invention, through converter smelting, LF refining, RH refinings, plate
The control of the strand that base continuous casting is produced, heating-up temperature and heat time is one of crucial production process, it is desirable to the tapping of slab
Temperature is in the range of 1200~1300 DEG C, it is therefore an objective to alloying element in slab is ensured can fully solid solution, while avoiding crystalline substance
Under conditions of grain is too grown up, slab heating temperature is improved, reduce rolling rolling load, reduced and roll difficulty.
Controlled rolling include roughing, Coil Box, finish rolling three process, roughing use five passes, after the completion of roughing in
Between base temperature in the range of 1050~1150 DEG C.Coil Box can effectively reduce temperature drop of the middle base on roller-way, while improving
Middle base temperature homogeneity, improves the stability of the product operation of rolling.Entry temperature at finishing in the range of 1000~1100 DEG C, really
De-scaling water comes into operation between two rolling mill frames before guarantor's finish rolling, and ensures de-scaling pressure >=10MPa, and exit temperature at finishing is 880~920
In the range of DEG C.
It is phase transformation strengthening and precipitation strength stage to roll rear section cooling and batch, and strip generates the Main Stage of intensity,
Therefore it is highly important production link, it is desirable to control cooling velocity >=20 DEG C/S, coiling temperature is 550~650 DEG C.
It is using the beneficial effect produced by above-mentioned technical proposal：The hot rolling of 1.5~2.0mm thickness that the present invention is produced
Wide flat steel yield strength >=700MPa, tensile strength >=800MPa, elongation percentage >=12% is organized as accounting for 95% ferrite, and
About 5% pearlite.
The 800MPa grade 1.5-2.0mm thickness broad hot strips that the present invention is produced, with former continuous hot-rolling mill produce hot rolling raw material,
Expectation thickness specification is machined to through cold rolling（1.5-2.0mm）, quenching-and-tempering process compare, Downstream processing saves big using user
Content of starting materials cost, while saving process time, reduces the production cycle.
Brief description of the drawings
Fig. 1 is the micro-organization chart of the broad hot strip of embodiment 1；
Fig. 2 is the micro-organization chart of the broad hot strip of embodiment 2；
Fig. 3 is the micro-organization chart of the broad hot strip of embodiment 3；
Fig. 4 is the micro-organization chart of the broad hot strip of embodiment 4；
Fig. 5 is the micro-organization chart of the broad hot strip of embodiment 5.
Specific embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Embodiment 1
A kind of tensile strength 800MPa grades of Ultra-thin broad hot strip, thickness is 1.5mm.Chemical composition is constituted and weight percent
Than for：C：0.08%, Si：0.12%, Mn：1.84%, P：0.008%, S：0.005%, Nb：0.053%, V：0.053%, Ti：
0.106%, Als：0.020%, balance of Fe and inevitable impurity element.
Production method comprises the steps：Converter smelting, LF refining, RH refinings, sheet billet continuous casting, heating of plate blank, water under high pressure
De-scaling, controlled rolling, controlled rolling are cooled down, batched.
Heating of plate blank operation, by heating of plate blank to 1275 DEG C.
Controlled rolling operation, controlled rolling is batched including roughing, Coil Box, finish rolling.After roughing is rolled through 5 roads, outlet temperature
Spend is 1120 DEG C.Finish rolling is rolled using 7 rolling mills, and entry temperature at finishing is 1080 DEG C, and exit temperature at finishing is 890 DEG C.Finish rolling
De-scaling water comes into operation between preceding two rolling mills frame, de-scaling pressure 13MPa.
Control refrigerating work procedure, 25 DEG C/S of section cooling speed, 600 DEG C of coiling temperature.
Broad hot strip mechanical property is shown in Table 1.
Embodiment 2
A kind of tensile strength 800MPa grades of Ultra-thin broad hot strip, thickness is 1.8mm.Chemical composition is constituted and weight percent
Than for：C：0.08%, Si：0.13%, Mn：1.78%, P：0.012%, S：0.004%, Nb：0.035%, V：0.055%, Ti：
0.101%, Als：0.018%, balance of Fe and inevitable impurity element.
Production method comprises the steps：Converter smelting, LF refining, RH refinings, sheet billet continuous casting, heating of plate blank, water under high pressure
De-scaling, controlled rolling, controlled rolling are cooled down, batched.
Heating of plate blank operation, by heating of plate blank to 1270 DEG C.
Controlled rolling operation, controlled rolling is batched including roughing, Coil Box, finish rolling.After roughing is rolled through 5 roads, outlet temperature
Spend is 1110 DEG C.Finish rolling is rolled using 7 rolling mills, and entry temperature at finishing is 1060 DEG C, and exit temperature at finishing is 880 DEG C.Finish rolling
De-scaling water comes into operation between preceding two rolling mills frame, de-scaling pressure 12MPa.
Control refrigerating work procedure, 25 DEG C/S of section cooling speed, 580 DEG C of coiling temperature.
Broad hot strip mechanical property is shown in Table 1.
Embodiment 3
A kind of tensile strength 800MPa grades of Ultra-thin broad hot strip, thickness is 1.6mm.Chemical composition is constituted and weight percent
Than for：C：0.08%, Si：0.29%, Mn：1.75%, P：0.012%, S：0.004%, Nb：0.048%, V：0.050%, Ti：
0.102%, Als：0.042%, balance of Fe and inevitable impurity element.
Production method comprises the steps：Converter smelting, LF refining, RH refinings, sheet billet continuous casting, heating of plate blank, water under high pressure
De-scaling, controlled rolling, controlled rolling are cooled down, batched.
Heating of plate blank operation, by heating of plate blank to 1260 DEG C.
Controlled rolling operation, controlled rolling is batched including roughing, Coil Box, finish rolling.After roughing is rolled through 5 roads, outlet temperature
Spend is 1100 DEG C.Finish rolling is rolled using 7 rolling mills, and entry temperature at finishing is 1050 DEG C, and exit temperature at finishing is 900 DEG C.Finish rolling
De-scaling water comes into operation between preceding two rolling mills frame, de-scaling pressure 11MPa.
Control refrigerating work procedure, 25 DEG C/S of section cooling speed, 600 DEG C of coiling temperature.
Broad hot strip mechanical property is shown in Table 1.
Embodiment 4
A kind of tensile strength 800MPa grades of Ultra-thin broad hot strip, thickness is 2.0mm.Chemical composition is constituted and weight percent
Than for：C：0.06%, Si：0.30%, Mn：2.00%, P：0.010%, S：0.005%, Nb：0.030%, V：0.06%, Ti：0.09%,
Als：0.010%, balance of Fe and inevitable impurity element.
Production method comprises the steps：Converter smelting, LF refining, RH refinings, sheet billet continuous casting, heating of plate blank, water under high pressure
De-scaling, controlled rolling, controlled rolling are cooled down, batched.
Heating of plate blank operation, by heating of plate blank to 1300 DEG C.
Controlled rolling operation, controlled rolling is batched including roughing, Coil Box, finish rolling.After roughing is rolled through 5 roads, outlet temperature
Spend is 1100 DEG C.Finish rolling is rolled using 7 rolling mills, and entry temperature at finishing is 1000 DEG C, and exit temperature at finishing is 860 DEG C.Finish rolling
De-scaling water comes into operation between preceding two rolling mills frame, de-scaling pressure 10MPa.
Control refrigerating work procedure, 24 DEG C/S of section cooling speed, 550 DEG C of coiling temperature.
Broad hot strip mechanical property is shown in Table 1.
Embodiment 5
A kind of tensile strength 800MPa grades of Ultra-thin broad hot strip, thickness is 1.5mm.Chemical composition is constituted and weight percent
Than for：C：0.10%, Si：0.20%, Mn：1.60%, P：0.020%, S：0.015%, Nb：0.060%, V：0.04%, Ti：0.13%,
Als：0.060%, balance of Fe and inevitable impurity element.
Production method comprises the steps：Converter smelting, LF refining, RH refinings, sheet billet continuous casting, heating of plate blank, water under high pressure
De-scaling, controlled rolling, controlled rolling are cooled down, batched.
Heating of plate blank operation, by heating of plate blank to 1200 DEG C.
Controlled rolling operation, controlled rolling is batched including roughing, Coil Box, finish rolling.After roughing is rolled through 5 roads, outlet temperature
Spend is 1100 DEG C.Finish rolling is rolled using 7 rolling mills, and entry temperature at finishing is 1100 DEG C, and exit temperature at finishing is 920 DEG C.Finish rolling
De-scaling water comes into operation between preceding two rolling mills frame, de-scaling pressure 12MPa.
Control refrigerating work procedure, 20 DEG C/S of section cooling speed, 650 DEG C of coiling temperature.
Broad hot strip mechanical property is shown in Table 1.
The embodiment 1-5 hot-rolled coil mechanical properties of table 1
Shown in table 1,800MPa grades that example 1~5 is produced, Ultra-thin（1.5-2.0mm）Broad hot strip, yield strength
720~755MPa, 815~840MPa of tensile strength, elongation percentage 14~16% are matched with good mechanical strength and plasticity.
Claims (10)
1. a kind of tensile strength 800MPa grades of Ultra-thin broad hot strip, it is characterised in that described to roll broadband steel chemical composition
Composition and percentage by weight are：C：0.06~0.10%, Si≤0.30%, Mn：1.60~2.00%, P≤0.020%, S≤
0.015%, Nb：0.030~0.060%, V：0.04~0.06%, Ti：0.09~0.13%, Als：0.010~0.060%, it is balance of
Fe and inevitable impurity element.
2. a kind of tensile strength 800MPa grades of Ultra-thin broad hot strip according to claim 1, it is characterised in that institute
Broad hot strip thickness is stated for 1.5-2.0mm.
3. a kind of tensile strength 800MPa grades of Ultra-thin broad hot strip according to claim 1, it is characterised in that institute
State broad hot strip tensile strength of mechanical property >=800MPa, yield strength >=700MPa, elongation percentage >=12%.
4. based on the production method described in claim 1-3 any one, it is characterised in that comprise the steps：Converter smelting,
LF refining, RH refinings, sheet billet continuous casting, heating of plate blank, high-pressure water descaling, controlled rolling, controlled rolling are cooled down, batched；The slab connects
Foundry work sequence, the Chemical Composition in Cast Billet chemical composition composition and percentage by weight are：C：0.06~0.10%, Si≤0.30%, Mn：
1.60~2.00%, P≤0.020%, S≤0.015%, Nb：0.030~0.060%, V：0.04~0.06%, Ti：0.09~
0.13%, Als：0.010~0.060%, balance of Fe and inevitable impurity element.
5. production method according to claim 4, it is characterised in that the controlled rolling operation, controlled rolling includes thick
Roll, Coil Box is batched, finish rolling.
6. production method according to claim 4, it is characterised in that the controlled rolling operation, roughing is rolled through 5 roads
Afterwards, outlet temperature is 1050~1150 DEG C.
7. production method according to claim 4, it is characterised in that the controlled rolling operation, entry temperature at finishing is
1000~1100 DEG C, exit temperature at finishing is 860~920 DEG C.
8. the production method according to claim 4-7 any one, it is characterised in that the heating of plate blank operation, by plate
Base is heated to 1200~1300 DEG C.
9. the production method according to claim 4-7 any one, it is characterised in that the controlled rolling operation, finish rolling
De-scaling water comes into operation between preceding two rolling mills frame, de-scaling pressure >=10MPa.
10. the production method according to claim 4-7 any one, it is characterised in that the control refrigerating work procedure, laminar flow
Cooling velocity >=20 DEG C/S, 550~650 DEG C of coiling temperature.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109266960A (en) * | 2018-09-26 | 2019-01-25 | 武汉钢铁有限公司 | Using the tensile strength >=800MPa thin gauge weathering steel and method of short route production |
| CN109778076A (en) * | 2019-02-12 | 2019-05-21 | 唐山不锈钢有限责任公司 | The production method of low-crackle sensitive S550MC Hot Rolling Automobile structural steel band |
| CN113278872A (en) * | 2021-05-19 | 2021-08-20 | 攀钢集团研究院有限公司 | VN microalloying engineering machinery steel and manufacturing method thereof |
| CN113600617A (en) * | 2021-07-13 | 2021-11-05 | 唐山钢铁集团有限责任公司 | Production method of thin 700 MPa-grade low-alloy high-strength steel |
| CN114345938A (en) * | 2022-01-04 | 2022-04-15 | 湖南华菱涟源钢铁有限公司 | Method for producing high-strength steel with yield strength of 700MPa grade based on short process and low cost |
| CN114959480A (en) * | 2022-05-31 | 2022-08-30 | 本钢板材股份有限公司 | High-strength hot-rolled coil for 650 MPa-level thin and wide tank and production method thereof |
| CN115261741A (en) * | 2022-07-21 | 2022-11-01 | 重庆钢铁股份有限公司 | Production method of hot-rolled X65 pipeline steel |
| CN115652217A (en) * | 2022-11-15 | 2023-01-31 | 山东钢铁集团日照有限公司 | Steel with high product of strength and elongation for high-strength corrugated beam and production method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109266960A (en) * | 2018-09-26 | 2019-01-25 | 武汉钢铁有限公司 | Using the tensile strength >=800MPa thin gauge weathering steel and method of short route production |
| CN109778076A (en) * | 2019-02-12 | 2019-05-21 | 唐山不锈钢有限责任公司 | The production method of low-crackle sensitive S550MC Hot Rolling Automobile structural steel band |
| CN113278872A (en) * | 2021-05-19 | 2021-08-20 | 攀钢集团研究院有限公司 | VN microalloying engineering machinery steel and manufacturing method thereof |
| CN113278872B (en) * | 2021-05-19 | 2022-03-22 | 攀钢集团研究院有限公司 | VN microalloying engineering machinery steel and manufacturing method thereof |
| CN113600617A (en) * | 2021-07-13 | 2021-11-05 | 唐山钢铁集团有限责任公司 | Production method of thin 700 MPa-grade low-alloy high-strength steel |
| CN114345938A (en) * | 2022-01-04 | 2022-04-15 | 湖南华菱涟源钢铁有限公司 | Method for producing high-strength steel with yield strength of 700MPa grade based on short process and low cost |
| CN114345938B (en) * | 2022-01-04 | 2024-02-09 | 湖南华菱涟源钢铁有限公司 | Method for producing high-strength steel with yield strength of 700MPa level based on short process and low cost |
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