CN103966502B - Low cost yield strength 400MPa level steel band and production method thereof - Google Patents
Low cost yield strength 400MPa level steel band and production method thereof Download PDFInfo
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Abstract
The invention discloses a kind of low cost yield strength 400MPa level steel band and production method thereof, does is the weight percentage of its composition: C? 0.18 ~ 0.22%, Mn? 0.20 ~ 0.40%, S≤0.020%, P≤0.025%, Si≤0.03%, Als? 0.015 ~ 0.035%, B? 0.0009 ~ 0.0030%, surplus Fe and inevitable impurity.This steel band adopts low silicomanganese, boron micro-alloyed thinking to reduce raw materials cost, and bar strip continuous casting and rolling flow path can be adopted to produce, and thickness specification is between 1.0 ~ 3.5mm, have and smelt simply, cost is lower, stable physical property, is applicable to the feature of industrial mass manufacture.The smelting of this steel band takes low silicomanganese and boron microalloy to control to reduce costs, continuous casting height pulling rate improves upstream device utilization ratio, continuously cast bloom directly enters stove and reduces costs, and control furnace temp and ensure product surface quality, the optimization of hot rolling technology meets product physicals; Have that technique is simple, cost is low, be suitable for the feature of industrial mass manufacture.
Description
Technical field
The present invention relates to a kind of steel band, especially a kind of low cost yield strength 400MPa level steel band and production method thereof.
Background technology
Along with the serious surplus of iron and steel production capacity, compete increasingly strong between each big steel enterprise, enterprises cost control consciousness is constantly strengthened, and constantly pursues the production of fine-grained management and high value added product between Iron and Steel Production chain.Improve the intensity of steel grade mainly through increasing Fe content and alloying elements nb, vanadium, titanium etc. in traditional low-alloy high-strength steel production, especially the steel grade of yield strength 400MPa level, traditional technology improves intensity by extensive control to increase Fe content, and the requirement of hot rolling technology is strict not.Except being improved except physicals by the increase of Fe content, then to have be exactly apply Hall-Petch grain refining strengthening principle, utilizes the steel grade of composition production yield strength at more than 400MPa of Q235 rank steel grade.This technique requires high to equipment and process, mainly controls and the burden requirement of last two rolling mills of finishing mill hot rolling finishing temperature in production; Finishing temperature must to meet two-phase region rolling between Ar3 ± 10 DEG C, and the last two rolling mill draught of finishing mill are more than 15%; Realized the object of deformation-induced ferrite transformation by two-phase region heavy reduction rolling, thus obtain ultrafine-grained (UFG) microstructure.
The method that current increase manganese element improves intensity for the production of in, but the higher fundamental interests that can not meet each enterprise of production cost.The production realizing high strength and low cost steel by obtaining ultrafine-grained (UFG) microstructure has its points of course, but the method cannot be used in enterprise's production in enormous quantities; Narrower according to the temperature range of Ar3 in the Composition Design of Q235 rank steel, cannot accurately control in course of hot rolling; Next is that in course of hot rolling, last two rolling mill loads are excessive, is unfavorable for coil of strip Strip Shape Control to equipment requirements is too high simultaneously; That mill load increase easily causes industrial accident again.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of low silicomanganese, boron micro-alloyed low cost yield strength 400MPa level steel band; Present invention also offers a kind of production method of low cost yield strength 400MPa level steel band.
For solving the problems of the technologies described above, the technical solution used in the present invention is: the weight percentage of its composition is: C0.18 ~ 0.22%, Mn0.20 ~ 0.40%, S≤0.020%, P≤0.025%, Si≤0.03%, Als0.015 ~ 0.035%, B0.0009 ~ 0.0030%, surplus Fe and inevitable impurity.
The inventive method comprises smelting procedure, continuous casting working procedure, heating process, hot-rolled process and cooling coiling process; Described smelting procedure is: molten iron is after converter smelting and the refining of LF stove, the weight percentage of gained molten steel composition is: C0.18 ~ 0.22%, Mn0.20 ~ 0.40%, S≤0.020%, P≤0.025%, Si≤0.03%, Als0.015 ~ 0.035%, B0.0009 ~ 0.0030%, surplus Fe and inevitable impurity.
Continuous casting working procedure described in the inventive method: take pulling rate to be that the high pulling rate of 4.5 ~ 5.5m/min waters steel;
Described heating process: it is 910 ~ 920 DEG C that continuously cast bloom enters furnace temp;
Described hot-rolled process: rough rolling process adopts heavy reduction rolling: during product thickness≤2.0mm, the draught of roughing R1 controls more than 50%, and the draught of R2 controls more than 28%, below workpiece thickness 14mm; During 2.0mm < product thickness≤3.5mm, roughing R1, R2 total reduction is 75 ~ 78%, workpiece thickness 14 ~ 16mm; Described finish rolling inlet temperature is 980 ~ 1020 DEG C; Described finishing temperature is 850 ± 10 DEG C;
Described cooling coiling process: adopt section cooling, section cooling pattern uses leading portion chilling; During product thickness≤2.0mm, coiling temperature is 630 ± 10 DEG C; During 2.0mm < product thickness≤3.5mm, coiling temperature is 620 ± 10 DEG C.
Preferably, heating process described in the inventive method: heating zone adopts syllogic; First heating zone temperature 1180 ~ 1280 DEG C, second and third heating zone temperature 1200 ~ 1280 DEG C; Soaking zone temperature controls at 1200 DEG C ± 20 DEG C, tapping temperature less than 1150 DEG C, and heat-processed keeps air-fuel ratio to be 3.15 ± 0.05.
Preferably, carry out the refining of LF stove when molten steel meets following requirement in converter described in the inventive method: composition C >=0.06wt%, P≤0.020wt%, S≤0.030wt%, and be used in conjunction bag temperature 1610 ~ 1650 DEG C or non-be used in conjunction bag 1650 ~ 1670 DEG C, Wensu; Described LF stove refining process adds ferro-boron, and ferro-boron add-on is 0.086 ~ 0.12kg/t.
The beneficial effect adopting technique scheme to produce is: the present invention adopts low silicomanganese, boron micro-alloyed thinking to reduce raw materials cost, bar strip continuous casting and rolling flow path can be adopted to produce, thickness specification is between 1.0 ~ 3.5mm, have and smelt simply, cost is lower, stable physical property, is applicable to the feature of industrial mass manufacture.
The inventive method is smelted and is taked low silicomanganese and boron microalloy to control to reduce costs, continuous casting height pulling rate improves upstream device utilization ratio, continuously cast bloom directly enters stove and reduces costs, and control furnace temp and ensure product surface quality, the optimization of hot rolling technology meets product physicals; Have that technique is simple, cost is low, be suitable for the feature of industrial mass manufacture.
Embodiment
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
Embodiment 1: this low cost yield strength 400MPa level steel band adopts following production stage.
(1) smelting procedure: adopt converter smelting, select capacity to be the oxygen top bottom blowing converter of 150 tons, technique is blended into converter by blast-melted routinely, more than watering, adds not siliceous auxiliary material in stove without high silicon, top blowing oxygen whole process BOTTOM ARGON BLOWING; Converter terminal controls: C0.09wt%, P0.018wt%, S0.020wt%, temperature=1640 DEG C (being used in conjunction bag).
Carry out conventional refinery at LF stove after converter tapping, ferro-boron add-on is 0.086kg/t; After the refining of LF stove, composition is: C=0.18wt%, Mn=0.20wt%, S=0.007wt%, P=0.022wt%, Si=0.03wt%, Als=0.015wt%, B=0.0009wt%, and all the other are Fe.
(2) continuous casting working procedure: pulling speed of continuous casting is 4.5m/min, enters process furnace heating after slab solidifies.
(3) heating process: it is 920 DEG C that continuously cast bloom enters furnace temp; Heating zone adopts syllogic; First heating zone temperature 1230 DEG C, second and third heating zone temperature 1280 DEG C; Soaking zone temperature controls at 1200 DEG C ± 5 DEG C, tapping temperature less than 1145 DEG C, and heat-processed keeps air-fuel ratio to be 3.15 ± 0.05.
(4) hot-rolled process: roughing R1 draught 49%, R2 draught 26%; R1, R2 total reduction 75%, workpiece thickness 15mm; Intermediate blank enters finishing train through middle laminar flow cooling roller bed, and cooling water inflow is opened and automatically controlled, and controlling finish rolling inlet temperature is between 980 ~ 995 DEG C; Finishing temperature all controls to be 845 ~ 855 DEG C.
(5) coiling process is cooled: section cooling pattern uses leading portion chilling, and coiling temperature is 615 ~ 625 DEG C; Hot-rolled product rolling thickness 3.5mm.
The present embodiment gained yield strength 400MPa level steel band: yield strength is 412MPa, and tensile strength is 519MPa, productivity 31% of having no progeny.
Embodiment 2: this low cost yield strength 400MPa level steel band adopts following production stage.
(1) smelting procedure: adopt converter smelting, select capacity to be the oxygen top bottom blowing converter of 150 tons, technique is blended into converter by blast-melted routinely, more than watering, adds not siliceous auxiliary material in stove without high silicon, top blowing oxygen whole process BOTTOM ARGON BLOWING; Converter terminal Composition Control is: C=0.08wt%, P=0.020wt%, S=0.015wt%, temperature=1645 DEG C (being used in conjunction bag).
Carry out conventional refinery at LF stove after converter tapping, ferro-boron add-on is 0.10kg/t; After the refining of LF stove, composition is: C=0.20wt%, Mn=0.30wt%, S=0.005wt%, P=0.020wt%, Si=0.02wt%, Als=0.030wt%, B=0.0014wt%.
(2) continuous casting working procedure: pulling speed of continuous casting is 5.0m/min, enters process furnace heating after slab solidifies.
(3) heating process: it is 910 DEG C that continuously cast bloom enters furnace temp; Heating zone adopts syllogic; First heating zone temperature 1180 DEG C, second and third heating zone temperature 1250 DEG C; Soaking zone temperature controls at 1180 ~ 1190 DEG C, tapping temperature 1130 DEG C, and heat-processed keeps air-fuel ratio to be 3.15 ± 0.05.
(4) hot-rolled process: roughing R1 draught 51%, R2 draught 29%, workpiece thickness 12mm; Intercooling water is closed, and finish rolling inlet temperature is between 990 ~ 1000 DEG C; Finishing temperature all controls to be 840 ~ 850 DEG C.
(5) coiling process is cooled: section cooling pattern uses leading portion chilling, and coiling temperature is 625 ~ 635 DEG C; Hot-rolled product rolling thickness 2.0mm.
The present embodiment gained yield strength 400MPa level steel band: yield strength is 430MPa, and tensile strength is 530MPa, productivity 28.5% of having no progeny.
Embodiment 3: this low cost yield strength 400MPa level steel band adopts following production stage.
(1) smelting procedure: adopt converter smelting, select capacity to be the oxygen top bottom blowing converter of 150 tons, technique is blended into converter by blast-melted routinely, more than watering, adds not siliceous auxiliary material in stove without high silicon, top blowing oxygen whole process BOTTOM ARGON BLOWING; Converter terminal Composition Control is: C=0.09wt%, P=0.020wt%, S=0.013wt%, temperature=1635 DEG C (being used in conjunction bag).
Carry out conventional refinery at LF stove after converter tapping, ferro-boron add-on is 0.095kg/t; After the refining of LF stove, composition is: C=0.22wt%, Mn=0.40wt%, S=0.003wt%, P=0.017wt%, Si=0.03wt%, Als=0.035wt%, B=0.0013wt%.
(2) continuous casting working procedure: pulling speed of continuous casting is 5.5m/min, enters process furnace heating after slab solidifies.
(3) heating process: it is 915 DEG C that continuously cast bloom enters furnace temp; Heating zone adopts syllogic; First heating zone temperature 1280 DEG C, second and third heating zone temperature 1200 DEG C; Soaking zone temperature controls at 1210 ~ 1220 DEG C, tapping temperature less than 1148 DEG C, and heat-processed keeps air-fuel ratio to be 3.15 ± 0.05.
(4) hot-rolled process: roughing R1 draught 52%, R2 draught 29.5%; Between roughing and finish rolling, water coolant is closed, workpiece thickness 11mm; Finish rolling inlet temperature is between 1010 ~ 1020 DEG C; Finishing temperature all controls to be 850 ~ 860 DEG C.
(5) coiling process is cooled: section cooling pattern uses leading portion chilling, and coiling temperature is 620 ~ 630 DEG C; Hot-rolled product rolling thickness 1.0mm.
The present embodiment gained yield strength 400MPa level steel band: yield strength is 420MPa, and tensile strength is 540MPa, productivity 26.5% of having no progeny.
Embodiment 4: this low cost yield strength 400MPa level steel band adopts following production stage.
(1) smelting procedure: adopt converter smelting, select capacity to be the oxygen top bottom blowing converter of 150 tons, technique is blended into converter by blast-melted routinely, more than watering, adds not siliceous auxiliary material in stove without high silicon, top blowing oxygen whole process BOTTOM ARGON BLOWING; Converter terminal Composition Control is: C=0.06wt%, P=0.016wt%, S=0.022wt%, temperature=1670 DEG C (non-be used in conjunction bag).
Carry out conventional refinery at LF stove after converter tapping, add ferro-boron 0.12kg/t; After the refining of LF stove, composition is: C=0.21wt%, Mn=0.35wt%, S=0.020wt%, P=0.019wt%, Si=0.01wt%, Als=0.020wt%, B=0.0030wt%, and all the other are Fe.
(2)-(3) continuous casting working procedure and heating process are with embodiment 1.
(4) hot-rolled process: R1, R2 total reduction 78%, workpiece thickness 16mm; All the other hot-rolled steps are with embodiment 1.
(5) coiling process is cooled: section cooling pattern uses leading portion chilling, and coiling temperature is 610 ~ 620 DEG C; Hot-rolled product rolling thickness 3.0mm.
The present embodiment gained yield strength 400MPa level steel band: yield strength is 418MPa, and tensile strength is 526MPa, productivity 29.5% of having no progeny.
Embodiment 5: this low cost yield strength 400MPa level steel band adopts following production stage.
(1) smelting procedure: adopt converter smelting, select capacity to be the oxygen top bottom blowing converter of 150 tons, technique is blended into converter by blast-melted routinely, more than watering, adds not siliceous auxiliary material in stove without high silicon, top blowing oxygen whole process BOTTOM ARGON BLOWING; Converter terminal Composition Control is: C=0.07wt%, P=0.019wt%, S=0.030wt%, temperature=1650 DEG C (non-be used in conjunction bag).
Carry out conventional refinery at LF stove after converter tapping, add ferro-boron 0.11kg/t; After the refining of LF stove, composition is: C=0.19wt%, Mn=0.28wt%, S=0.011wt%, P=0.025wt%, Si=0.023wt%, Als=0.024wt%, B=0.0018wt%, and all the other are Fe.
(2)-(3) each operation is with embodiment 2.
(4) hot-rolled process: roughing R1 draught 53%, R2 draught 28.5%, workpiece thickness 13mm; All the other techniques are with embodiment 2.
(5) coiling process is cooled: section cooling pattern uses leading portion chilling, and coiling temperature is 630 ~ 640 DEG C; Hot-rolled product rolling thickness 1.5mm.
The present embodiment gained yield strength 400MPa level steel band: yield strength is 428MPa, and tensile strength is 534MPa, productivity 27% of having no progeny.
Embodiment 6: this low cost yield strength 400MPa level steel band adopts following production stage.
(1)-(3) each operation is with embodiment 1.
(4) hot-rolled process: R1, R2 total reduction 77%, workpiece thickness 14mm; All the other techniques are with embodiment 1.
(5) coiling process is cooled: section cooling pattern uses leading portion chilling, and coiling temperature is 620 ~ 630 DEG C; Hot-rolled product rolling thickness 2.5mm.
The present embodiment gained yield strength 400MPa level steel band: yield strength is 420MPa, and tensile strength is 532MPa, productivity 28% of having no progeny.
Claims (3)
1. a production method for low cost yield strength 400MPa level steel band, is characterized in that: it comprises smelting procedure, continuous casting working procedure, heating process, hot-rolled process and cooling coiling process;
Described smelting procedure is: molten iron is after converter smelting and the refining of LF stove, the weight percentage of gained molten steel composition is: C0.18 ~ 0.22%, Mn0.20 ~ 0.40%, S≤0.020%, P≤0.025%, Si≤0.03%, Als0.015 ~ 0.035%, B0.0009 ~ 0.0030%, surplus Fe and inevitable impurity;
Described continuous casting working procedure: take pulling rate to be that the high pulling rate of 4.5 ~ 5.5m/min waters steel;
Described heating process: it is 910 ~ 920 DEG C that continuously cast bloom enters furnace temp;
Described hot-rolled process: rough rolling process adopts heavy reduction rolling: during product thickness≤2.0mm, the draught of roughing R1 controls more than 50%, and the draught of R2 controls more than 28%, below workpiece thickness 14mm; During 2.0mm < product thickness≤3.5mm, roughing R1, R2 total reduction is 75 ~ 78%, workpiece thickness 14 ~ 16mm; Finish rolling inlet temperature is 980 ~ 1020 DEG C; Finishing temperature is 850 ± 10 DEG C;
Described cooling coiling process: adopt section cooling, section cooling pattern uses leading portion chilling; During product thickness≤2.0mm, coiling temperature is 630 ± 10 DEG C; During 2.0mm < product thickness≤3.5mm, coiling temperature is 620 ± 10 DEG C.
2. the production method of low cost yield strength 400MPa level steel band according to claim 1, is characterized in that, described heating process: heating zone adopts syllogic; First heating zone temperature 1180 ~ 1280 DEG C, second and third heating zone temperature 1200 ~ 1280 DEG C; Soaking zone temperature controls at 1200 DEG C ± 20 DEG C, tapping temperature less than 1150 DEG C, and heat-processed keeps air-fuel ratio to be 3.15 ± 0.05.
3. the production method of low cost yield strength 400MPa level steel band according to claim 1 and 2, it is characterized in that, carry out the refining of LF stove when molten steel meets following requirement in described converter: composition C >=0.06wt%, P≤0.020wt%, S≤0.030wt%, and be used in conjunction bag temperature 1610 ~ 1650 DEG C or non-and be used in conjunction bag temperature 1650 ~ 1670 DEG C;
Described LF stove refining process adds ferro-boron, and ferro-boron add-on is 0.086 ~ 0.12kg/t.
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| CN106756564A (en) * | 2017-01-12 | 2017-05-31 | 唐山钢铁集团有限责任公司 | A kind of yield strength 700MPa grades of steel band and its production method |
| CN108480416B (en) * | 2018-02-01 | 2021-09-07 | 日照宝华新材料有限公司 | Method for producing non-spangle galvanized sheet based on sheet billet continuous casting and continuous rolling hot base raw material and acid pickling galvanizing continuous production line |
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| CN113684423B (en) * | 2021-10-26 | 2022-01-28 | 江苏省沙钢钢铁研究院有限公司 | High-carbon steel wire rod |
| CN115491601A (en) * | 2022-09-20 | 2022-12-20 | 武汉钢铁有限公司 | Economical magnet yoke steel with yield strength of 350MPa grade produced by CSP production line and production method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101457329A (en) * | 2008-09-28 | 2009-06-17 | 马鞍山钢铁股份有限公司 | Steel for boron micro-alloying waste heat treatment steel bar |
| CN103343209A (en) * | 2013-07-17 | 2013-10-09 | 哈尔滨工业大学（威海） | Controlled rolling and controlled cooling technique for improving performance of Q235 steel plate |
| CN103509996A (en) * | 2013-09-25 | 2014-01-15 | 马钢(集团)控股有限公司 | 400 MPa-tensile-strength high-strength carbon-manganese constructional steel and manufacturing method thereof |
| CN103627951A (en) * | 2013-12-06 | 2014-03-12 | 马钢(集团)控股有限公司 | High-toughness boracic carbon structural steel plate roll and production method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3576017B2 (en) * | 1998-11-30 | 2004-10-13 | 石川島播磨重工業株式会社 | Method for producing steel with excellent impact penetration resistance |
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2014
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101457329A (en) * | 2008-09-28 | 2009-06-17 | 马鞍山钢铁股份有限公司 | Steel for boron micro-alloying waste heat treatment steel bar |
| CN103343209A (en) * | 2013-07-17 | 2013-10-09 | 哈尔滨工业大学（威海） | Controlled rolling and controlled cooling technique for improving performance of Q235 steel plate |
| CN103509996A (en) * | 2013-09-25 | 2014-01-15 | 马钢(集团)控股有限公司 | 400 MPa-tensile-strength high-strength carbon-manganese constructional steel and manufacturing method thereof |
| CN103627951A (en) * | 2013-12-06 | 2014-03-12 | 马钢(集团)控股有限公司 | High-toughness boracic carbon structural steel plate roll and production method thereof |
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Address after: 063016 Binhe Road, Hebei, Tangshan City, No. 9 Patentee after: River steel Limited by Share Ltd Tangshan branch Address before: 063016 Binhe Road, Hebei, Tangshan City, No. 9 Patentee before: Hebei Steel Co., Ltd., Tangshan Branch |