CN109706401A - A kind of production technology of 690MPa high reaming steel band - Google Patents
A kind of production technology of 690MPa high reaming steel band Download PDFInfo
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Abstract
The invention discloses a kind of production technologies of 690MPa high reaming steel band, including converter smelting, the refining of LF furnace, sheet billet continuous casting, heating, roughing, finish rolling, cooling and coiling process；The finishing rolling step, 1040~1090 DEG C of inlet temperature, 830~880 DEG C of finishing temperature；The cooling process, steel band is as cold as 680~720 DEG C, intermediate air-cooled 4~8s through section cooling front coarse adjustment section with 35~50 DEG C/s cooling rate fastly, then is as cold as 450~500 DEG C fastly through section cooling rear portion accurate adjustment section with 20~30 DEG C/s cooling rate.The present invention rationally designs hot-rolling temperature system and cooling strategy, give full play to niobium, titanium micro-alloyed strengthening effect, using means such as refined crystalline strengthening and precipitation strengths, the steel grade is set to still ensure that higher reaming performance while with higher-strength, it can be used for manufacturing auto parts with complex shape, it can reduce and use steel plate thickness, mitigate complete vehicle weight, reduce Fuel consumption.
Description
Technical field
The present invention relates to a kind of production technology of hot rolled strip, especially a kind of production work of 690MPa high reaming steel band
Skill.
Background technique
Raising with automobile market to the requirements such as energy-saving and environmental protection, safety, comfortable, Vehicle mass reduction become current
The important development direction of automotive technology development.Since high-strength steel and super-high strength steel are while mitigating car body weight, moreover it is possible to improve
The structural strength and energy absorption capability of body of a motor car, therefore the application of high-strength steel and super-high strength steel on automobile is more and more wider
It is general.Up to now, high-strength steel and super-high strength steel are still one of most economical, most effective lightweight approach.
The earliest Research foundation of high reaming steel is from traditional dual phase steel, according to data introduction, Nippon Steel, JFE, Baosteel,
There have been 10 to 20 years knowhows in the international advanced iron and steel enterprise of Pu Xiangdeng.0.1Ti is added as Kawasaki Steel utilizes in DP steel,
Strengthen the ferrite that slow cooling is formed with TiC, precipitation strength is carried out to this ferrite, improves the reaming performance of DP steel, the trade mark has
RHA540SK, 540DH, 590SK, 590DH, 690DH, 780DH are the high reaming steel using the exploitation of this principle.But
It is found in application process, this material is very easy to when making certain components for needing larger reaming amount and flange amount
Existing cracking phenomena.It is obtained by the research to this phenomenon, this is because the difference of hardness of ferrite and martensite in dual phase steel
It is too not big, cause the hole expansibility of dual phase steel lower.In order to solve this problem, consider to can be improved dual phase steel hole expansibility, at present
It uses bainite to replace martensite as the second phase using most, forms ferrite+bainite structure.Due to the hardness of bainite
Value is significantly less than martensite, and bainite also decreases with ferritic difference of hardness, and the steel plate obtained in this way has excellent expansion
Pore performance.
The research and development of the high intensity, high elongation rate, high hole expansibility steel sheet product of high added value, can constantly promote automobile steel
High strengthening, to meet the requirement of automobile industry increasingly increased high security, high-environmental, while promoting automobile steel product
Whole competitiveness.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of production technologies of 690MPa high reaming steel band.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of life of 690MPa high reaming steel band
Production. art, the production technology include converter smelting, the refining of LF furnace, sheet billet continuous casting, heating, roughing, finish rolling, cooling and fourth hand
Sequence；The finishing rolling step, 1040~1090 DEG C of entry temperature at finishing, 830~880 DEG C of finishing temperature；The cooling process, steel band
It is as cold as 680~720 DEG C, intermediate air-cooled 4~8s fastly with 35~50 DEG C/s cooling rate through section cooling front coarse adjustment section, then cold through laminar flow
But accurate adjustment section in rear portion is as cold as 450~500 DEG C with 20~30 DEG C/s cooling rate fastly.
Converter smelting and LF furnace refining procedure of the present invention, molten iron and steel scrap is added in converter smelting, in order to guarantee terminal P
Content is qualified, prevents after-blow, draws the method for re-blowing to blow using height, stirs operation after all using before terminal tapping；Refining uses
Heating, composition adjustment, Calcium treatment.
Sheet billet continuous casting process of the present invention, 180~230mm of thickness of strand.
Heating process of the present invention, through stepped heating stove heating, total time in furnace of heating furnace be 150~
240min, 1250~1310 DEG C of heating furnace soaking zone heating temperature.
Roughing operation of the present invention, intermediate 30~36mm of sotck thinkness reach drop after Coil Box is batched and overturned end to end
The purpose for tail temperature difference of bowing.
Finishing rolling step of the present invention rolls into the steel band with a thickness of 2.0~4.0mm by 7 passage finish rolling.
Coiling process of the present invention, coiling temperature are 450~500 DEG C.
The thickness specification of steel band of the present invention is 2.0~4.0mm.
Steel band tensile strength Rm >=690MPa of the present invention, yield strength Rp0.2: 550~720MPa, elongation after fracture
A80>=12%, hole expansibility >=55%.
Steel band chemical component composition and its mass percentage of the present invention are as follows: C:0.04~0.08%, Mn:1.00~
1.35%, Cr:0.30~0.45%, Mn+Cr:1.30~1.80%, S≤0.010%, P≤0.020%, Si≤0.25%, Ti:0.07
~0.12%, Nb:0.020~0.060%, Als:0.020~0.060%, remaining is iron and inevitable impurity.
690MPa high reaming strip product canonical reference prEN10338:2013 cold formability multi-phase Steels hot rolling of the present invention and
The uncoated plate product of the cold rolling-technology term of delivery；Properties of product detection method canonical reference GB-T228 metal material room temperature is drawn
Stretch test method.
The beneficial effects of adopting the technical scheme are that the 1, present invention rationally designs hot-rolling temperature system and cold
Tactful, using higher 830~880 DEG C of finishing temperatures, niobium, titanium micro-alloyed strengthening effect are given full play to, it is strong using fine grain
The means such as change and precipitation strength, make steel grade of the present invention still ensure that higher hole expandability while with higher-strength
Can, it can be used for manufacturing auto parts with complex shape.2, high reaming steel band tensile strength Rm >=690MPa of the present invention,
Yield strength Rp0.2: 550~720MPa, elongation after fracture A80>=12%, hole expansibility >=55%.3, high reaming produced by the invention
Steel can reduce using steel plate thickness while improving auto parts intensity, mitigate complete vehicle weight, reduce Fuel consumption.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
Embodiment 1
The present embodiment 690MPa high reaming thickness of strips specification be 3.0mm, production technology include converter smelting, LF furnace refining,
Sheet billet continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: molten iron and steel scrap is added in converter smelting, draws the method for re-blowing to blow using height,
Operation is stirred after all using before terminal tapping；Refining uses heating, composition adjustment, Calcium treatment；
(2) sheet billet continuous casting process: thickness of strand 200mm；Steel billet chemical component composition and its mass percentage are as follows: C:
0.04%, Mn:1.20%, Cr:0.30%, Mn+Cr:1.50%, S:0.002%, P:0.010%, Si:0.18%, Ti:0.010%, Nb:
0.030%, Als:0.045%, remaining is iron and inevitable impurity；
(3) heating process: being 150min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1300 DEG C of heating temperature；
(4) roughing operation: intermediate sotck thinkness 34mm is batched through Coil Box and is overturned end to end；
(5) steel band with a thickness of 3.0mm finishing rolling step: is rolled by 7 passage finish rolling；1070 DEG C of entry temperature at finishing, finish to gauge temperature
870 DEG C of degree；
(6) cooling process: steel band is as cold as 700 DEG C, intermediate air-cooled 6s through laminar flow front coarse adjustment section with 37 DEG C/s cooling rate fastly, then through layer
It flows rear portion accurate adjustment section and is as cold as 470 DEG C fastly with 22 DEG C/s cooling rate；
(7) coiling process: coiling temperature is 470 DEG C, and high reaming hot rolled strip is obtained after batching.
The present embodiment 690MPa high reaming steel band mechanical property: tensile strength Rm:765MPa, yield strength Rp0.2:
687MPa, elongation after fracture A80: 15.5%, hole expansibility: 80.7%.
Embodiment 2
The present embodiment 690MPa high reaming thickness of strips specification be 4.0mm, production technology include converter smelting, LF furnace refining,
Sheet billet continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: molten iron and steel scrap is added in converter smelting, draws the method for re-blowing to blow using height,
Operation is stirred after all using before terminal tapping；Refining uses heating, composition adjustment, Calcium treatment；
(2) sheet billet continuous casting process: thickness of strand 200mm；Steel billet chemical component composition and its mass percentage are as follows: C:
0.05%, Mn:1.35%, Cr:0.45%, Mn+Cr:1.80%, S:0.003%, P:0.012%, Si:0.08%, Ti:0.08%, Nb:
0.050%, Als:0.032%, remaining is iron and inevitable impurity；
(3) heating process: being 200min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1280 DEG C of heating temperature；
(4) roughing operation: intermediate sotck thinkness 36mm is batched through Coil Box and is overturned end to end；
(5) steel band with a thickness of 4.0mm finishing rolling step: is rolled by 7 passage finish rolling；1040 DEG C of entry temperature at finishing, finish to gauge temperature
880 DEG C of degree；
(6) cooling process: steel band is as cold as 680 DEG C, intermediate air-cooled 8s through laminar flow front coarse adjustment section with 39 DEG C/s cooling rate fastly, then through layer
It flows rear portion accurate adjustment section and is as cold as 450 DEG C fastly with 24 DEG C/s cooling rate；
(7) coiling process: coiling temperature is 450 DEG C, and high reaming hot rolled strip is obtained after batching.
The present embodiment 690MPa high reaming steel band mechanical property: tensile strength Rm:799MPa, yield strength Rp0.2:
718MPa, elongation after fracture A80: 14%, hole expansibility: 65.3%.
Embodiment 3
The present embodiment 690MPa high reaming thickness of strips specification be 2.5mm, production technology include converter smelting, LF furnace refining,
Sheet billet continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: molten iron and steel scrap is added in converter smelting, draws the method for re-blowing to blow using height,
Operation is stirred after all using before terminal tapping；Refining uses heating, composition adjustment, Calcium treatment；
(2) sheet billet continuous casting process: thickness of strand 230mm；Steel billet chemical component composition and its mass percentage are as follows: C:
0.05%, Mn:1.30%, Cr:0.32%, Mn+Cr:1.62%, S:0.002%, P:0.015%, Si:0.15%, Ti:0.010%, Nb:
0.040%, Als:0.025%, remaining is iron and inevitable impurity；
(3) heating process: being 240min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1310 DEG C of heating temperature；
(4) roughing operation: intermediate sotck thinkness 32mm is batched through Coil Box and is overturned end to end；
(5) steel band with a thickness of 2.5mm finishing rolling step: is rolled by 7 passage finish rolling；1080 DEG C of entry temperature at finishing, finish to gauge temperature
860 DEG C of degree；
(6) cooling process: steel band is as cold as 710 DEG C, intermediate air-cooled 4.5s through laminar flow front coarse adjustment section with 41 DEG C/s cooling rate fastly, then passes through
Accurate adjustment section in laminar flow rear portion is as cold as 500 DEG C with 26 DEG C/s cooling rate fastly；
(7) coiling process: coiling temperature is 500 DEG C, and high reaming hot rolled strip is obtained after batching.
The present embodiment 690MPa high reaming steel band mechanical property: tensile strength Rm:723MPa, yield strength Rp0.2:
672MPa, elongation after fracture A80: 14.5%, hole expansibility: 70.6%.
Embodiment 4
The present embodiment 690MPa high reaming thickness of strips specification be 2.0mm, production technology include converter smelting, LF furnace refining,
Sheet billet continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: molten iron and steel scrap is added in converter smelting, draws the method for re-blowing to blow using height,
Operation is stirred after all using before terminal tapping；Refining uses heating, composition adjustment, Calcium treatment；
(2) sheet billet continuous casting process: thickness of strand 200mm；Steel billet chemical component composition and its mass percentage are as follows: C:
0.08%, Mn:1.00%, Cr:0.35%, Mn+Cr:1.35%, S:0.002%, P:0.012%, Si:0.25%, Ti:0.12%, Nb:
0.020%, Als:0.025%, remaining is iron and inevitable impurity；
(3) heating process: being 175min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1260 DEG C of heating temperature；
(4) roughing operation: intermediate sotck thinkness 30mm is batched through Coil Box and is overturned end to end；
(5) steel band with a thickness of 2.0mm finishing rolling step: is rolled by 7 passage finish rolling；1090 DEG C of entry temperature at finishing, finish to gauge temperature
860 DEG C of degree；
(6) cooling process: steel band is as cold as 720 DEG C, intermediate air-cooled 4s through laminar flow front coarse adjustment section with 43 DEG C/s cooling rate fastly, then through layer
It flows rear portion accurate adjustment section and is as cold as 470 DEG C fastly with 28 DEG C/s cooling rate；
(7) coiling process: coiling temperature is 470 DEG C, and high reaming hot rolled strip is obtained after batching.
The present embodiment 690MPa high reaming steel band mechanical property: tensile strength Rm:778MPa, yield strength Rp0.2:
710MPa, elongation after fracture A80: 13%, hole expansibility: 61.5%.
Embodiment 5
The present embodiment 690MPa high reaming thickness of strips specification be 3.5mm, production technology include converter smelting, LF furnace refining,
Sheet billet continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: molten iron and steel scrap is added in converter smelting, draws the method for re-blowing to blow using height,
Operation is stirred after all using before terminal tapping；Refining uses heating, composition adjustment, Calcium treatment；
(2) sheet billet continuous casting process: thickness of strand 210mm；Steel billet chemical component composition and its mass percentage are as follows: C:
0.06%, Mn:1.05%, Cr:0.40%, Mn+Cr:1.45%, S:0.010%, P:0.020%, Si:0.15%, Ti:0.07%, Nb:
0.060%, Als:0.020%, remaining is iron and inevitable impurity；
(3) heating process: being 170min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1250 DEG C of heating temperature；
(4) roughing operation: intermediate sotck thinkness 35mm is batched through Coil Box and is overturned end to end；
(5) steel band with a thickness of 3.5mm finishing rolling step: is rolled by 7 passage finish rolling；1070 DEG C of entry temperature at finishing, finish to gauge temperature
830 DEG C of degree；
(6) cooling process: steel band is as cold as 690 DEG C, intermediate air-cooled 5s through laminar flow front coarse adjustment section with 45 DEG C/s cooling rate fastly, then through layer
It flows rear portion accurate adjustment section and is as cold as 460 DEG C fastly with 25 DEG C/s cooling rate；
(7) coiling process: coiling temperature is 460 DEG C, and high reaming hot rolled strip is obtained after batching.
The present embodiment 690MPa high reaming steel band mechanical property: tensile strength Rm:789MPa, yield strength Rp0.2:
706MPa, elongation after fracture A80: 13%, hole expansibility: 60.3%.
Embodiment 6
The present embodiment 690MPa high reaming thickness of strips specification be 2.2mm, production technology include converter smelting, LF furnace refining,
Sheet billet continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: molten iron and steel scrap is added in converter smelting, draws the method for re-blowing to blow using height,
Operation is stirred after all using before terminal tapping；Refining uses heating, composition adjustment, Calcium treatment；
(2) sheet billet continuous casting process: thickness of strand 225mm；Steel billet chemical component composition and its mass percentage are as follows: C:
0.07%, Mn:1.28%, Cr:0.37%, Mn+Cr:1.65%, S:0.004%, P:0.009%, Si:0.10%, Ti:0.09%, Nb:
0.050%, Als:0.060%, remaining is iron and inevitable impurity；
(3) heating process: being 210min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1270 DEG C of heating temperature；
(4) roughing operation: intermediate sotck thinkness 32mm is batched through Coil Box and is overturned end to end；
(5) steel band with a thickness of 2.2mm finishing rolling step: is rolled by 7 passage finish rolling；1060 DEG C of entry temperature at finishing, finish to gauge temperature
840 DEG C of degree；
(6) cooling process: steel band is as cold as 700 DEG C, intermediate air-cooled 7s through laminar flow front coarse adjustment section with 47 DEG C/s cooling rate fastly, then through layer
It flows rear portion accurate adjustment section and is as cold as 480 DEG C fastly with 27 DEG C/s cooling rate；
(7) coiling process: coiling temperature is 480 DEG C, and high reaming hot rolled strip is obtained after batching.
The present embodiment 690MPa high reaming steel band mechanical property: tensile strength Rm:768MPa, yield strength Rp0.2:
712MPa, elongation after fracture A80: 14.5%, hole expansibility: 59.3%.
Embodiment 7
The present embodiment 690MPa high reaming thickness of strips specification be 3.3mm, production technology include converter smelting, LF furnace refining,
Sheet billet continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: molten iron and steel scrap is added in converter smelting, draws the method for re-blowing to blow using height,
Operation is stirred after all using before terminal tapping；Refining uses heating, composition adjustment, Calcium treatment；
(2) sheet billet continuous casting process: thickness of strand 220mm；Steel billet chemical component composition and its mass percentage are as follows: C:
0.045%, Mn:1.33%, Cr:0.42%, Mn+Cr:1.75%, S:0.005%, P:0.011%, Si:0.18%, Ti:0.11%, Nb:
0.045%, Als:0.040%, remaining is iron and inevitable impurity；
(3) heating process: being 220min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1300 DEG C of heating temperature；
(4) roughing operation: intermediate sotck thinkness 33mm is batched through Coil Box and is overturned end to end；
(5) steel band with a thickness of 3.3mm finishing rolling step: is rolled by 7 passage finish rolling；1065 DEG C of entry temperature at finishing, finish to gauge temperature
840 DEG C of degree；
(6) cooling process: steel band is as cold as 685 DEG C, intermediate air-cooled 4s through laminar flow front coarse adjustment section with 50 DEG C/s cooling rate fastly, then through layer
It flows rear portion accurate adjustment section and is as cold as 495 DEG C fastly with 20 DEG C/s cooling rate；
(7) coiling process: coiling temperature is 495 DEG C, and high reaming hot rolled strip is obtained after batching.
The present embodiment 690MPa high reaming steel band mechanical property: tensile strength Rm:760MPa, yield strength Rp0.2:
702MPa, elongation after fracture A80: 13.5%, hole expansibility: 54.6%.
Embodiment 8
The present embodiment 690MPa high reaming thickness of strips specification be 2.8mm, production technology include converter smelting, LF furnace refining,
Sheet billet continuous casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: molten iron and steel scrap is added in converter smelting, draws the method for re-blowing to blow using height,
Operation is stirred after all using before terminal tapping；Refining uses heating, composition adjustment, Calcium treatment；
(2) sheet billet continuous casting process: thickness of strand 180mm；Steel billet chemical component composition and its mass percentage are as follows: C:
0.065%, Mn:1.00%, Cr:0.30%, Mn+Cr:1.30%, S:0.007%, P:0.013%, Si:0.21%, Ti:0.08%, Nb:
0.035%, Als:0.055%, remaining is iron and inevitable impurity；
(3) heating process: being 225min, heating furnace soaking zone in total time in furnace of heating furnace through stepped heating stove heating
1275 DEG C of heating temperature；
(4) roughing operation: intermediate sotck thinkness 35mm is batched through Coil Box and is overturned end to end；
(5) steel band with a thickness of 2.8mm finishing rolling step: is rolled by 7 passage finish rolling；1085 DEG C of entry temperature at finishing, finish to gauge temperature
845 DEG C of degree；
(6) cooling process: steel band is as cold as 705 DEG C, intermediate air-cooled 8s through laminar flow front coarse adjustment section with 35 DEG C/s cooling rate fastly, then through layer
It flows rear portion accurate adjustment section and is as cold as 475 DEG C fastly with 30 DEG C/s cooling rate；
(7) coiling process: coiling temperature is 475 DEG C, and high reaming hot rolled strip is obtained after batching.
The present embodiment 690MPa high reaming steel band mechanical property: tensile strength Rm:692MPa, yield strength Rp0.2:
558MPa, elongation after fracture A80: 14%, hole expansibility: 57.6%.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (9)
1. a kind of production technology of 690MPa high reaming steel band, which is characterized in that the production technology includes converter smelting, LF furnace
Refining, sheet billet continuous casting, heating, roughing, finish rolling, cooling and coiling process；The finishing rolling step, entry temperature at finishing 1040~
1090 DEG C, 830~880 DEG C of finishing temperature；The cooling process, steel band are cold with 35~50 DEG C/s through section cooling front coarse adjustment section
Speed is as cold as 680~720 DEG C, intermediate air-cooled 4~8s fastly, then is as cold as fastly through section cooling rear portion accurate adjustment section with 20~30 DEG C/s cooling rate
450~500 DEG C.
2. a kind of production technology of 690MPa high reaming steel band according to claim 1, which is characterized in that the slab connects
Foundry work sequence, 180~230mm of thickness of strand.
3. a kind of production technology of 690MPa high reaming steel band according to claim 1, which is characterized in that the heater
Sequence is 150~240min, heating furnace soaking zone heating temperature in total time in furnace of heating furnace through stepped heating stove heating
1250~1310 DEG C.
4. a kind of production technology of 690MPa high reaming steel band according to claim 1, which is characterized in that the roughing work
Sequence, intermediate 30~36mm of sotck thinkness, batches through Coil Box and overturns end to end.
5. a kind of production technology of 690MPa high reaming steel band according to claim 1, which is characterized in that the finish rolling work
Sequence rolls into the steel band with a thickness of 2.0~4.0mm by 7 passage finish rolling.
6. a kind of production technology of 690MPa high reaming steel band according to claim 1, which is characterized in that the fourth hand
Sequence, coiling temperature are 450~500 DEG C.
7. a kind of production technology of 690MPa high reaming steel band described in -6 any one according to claim 1, which is characterized in that
The thickness specification of the steel band is 2.0~4.0mm.
8. a kind of production technology of 690MPa high reaming steel band described in -6 any one according to claim 1, which is characterized in that
The steel band tensile strength Rm >=690MPa, yield strength Rp0.2: 550~720MPa, elongation after fracture A80>=12%, hole expansibility
≥55%。
9. a kind of production technology of 690MPa high reaming steel band described in -6 any one according to claim 1, which is characterized in that
The steel band chemical component composition and its mass percentage are as follows: C:0.04~0.08%, Mn:1.00~1.35%, Cr:0.30~
0.45%, Mn+Cr:1.30~1.80%, S≤0.010%, P≤0.020%, Si≤0.25%, Ti:0.07~0.12%, Nb:0.020
~0.060%, Als:0.020~0.060%, remaining is iron and inevitable impurity.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112251581A (en) * | 2020-09-21 | 2021-01-22 | 唐山不锈钢有限责任公司 | Production method of hot-rolled steel strip for cold-stamped axle housing with yield of 460MPa |
| CN114480955A (en) * | 2021-12-14 | 2022-05-13 | 唐山不锈钢有限责任公司 | Steel strip and production method thereof |
| CN115198202A (en) * | 2022-09-19 | 2022-10-18 | 苏州创镕新材料科技有限公司 | 700 MPa-level high-strength thinning material for vehicle oil tank bracket and preparation method thereof |
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| CN107747042A (en) * | 2017-11-06 | 2018-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of high reaming steel of the economical great surface quality of 690MPa levels and preparation method thereof |
| CN108570604A (en) * | 2018-04-28 | 2018-09-25 | 唐山钢铁集团有限责任公司 | A kind of high reaming steel band of 780MPa grades of hot rolling acid-cleaning and its production method |
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| CN112251581A (en) * | 2020-09-21 | 2021-01-22 | 唐山不锈钢有限责任公司 | Production method of hot-rolled steel strip for cold-stamped axle housing with yield of 460MPa |
| CN114480955A (en) * | 2021-12-14 | 2022-05-13 | 唐山不锈钢有限责任公司 | Steel strip and production method thereof |
| CN115198202A (en) * | 2022-09-19 | 2022-10-18 | 苏州创镕新材料科技有限公司 | 700 MPa-level high-strength thinning material for vehicle oil tank bracket and preparation method thereof |
| CN115198202B (en) * | 2022-09-19 | 2022-12-27 | 苏州创镕新材料科技有限公司 | 700 MPa-level high-strength thinning material of vehicle oil tank bracket and preparation method thereof |
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Application publication date: 20190503 |