CN102925791B - Steel easy to pickle and production method of steel - Google Patents
Steel easy to pickle and production method of steel Download PDFInfo
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- CN102925791B CN102925791B CN201210435101.2A CN201210435101A CN102925791B CN 102925791 B CN102925791 B CN 102925791B CN 201210435101 A CN201210435101 A CN 201210435101A CN 102925791 B CN102925791 B CN 102925791B
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Abstract
The invention discloses steel easy to pickle. The steel comprises, by weight, 0.068-0.097% of C, no more than 0.03% of Si, 0.27%-0.60% of Mn, no more than 0.015% of P, no more than 0.010% of S, 0.028-0.050% 0f Als and no more than 0.005% of N. The production method comprises the steps of conducting molten iron desulphurization; smelting and performing continuous casting to obtain a blank; heating the casting blank; conducting rough rolling; conducting finish rolling; performing laminar cooling; and reeling for use. The method is characterized in that scale on the surface of a steel plate is thin, the content of FeO in the scale is high, the scale on the edge is not too thick, the generation of Fe2O3 is avoided, and a scale structure which is easy to pickle is obtained; a low-temperature short-time heating method and a low-temperature rolling method are used, the disadvantages that the energy consumption is high, the oxidization burning loss is serious, the yield is low, the roll wearing is serious, and the oxidation defect rate is high due to the conventional high-temperature long-time heating and rolling are avoided, the convexity degree of a control panel is no more than 40 mu m, and the uniformity of the scale of the panel surface can be improved.
Description
Technical field
The present invention relates to hot-rolled steel sheet or steel band and production method thereof, belong to a kind of easily pickling steel and production method thereof particularly.
Background technology
Hot rolled strip carry out cold rolling before or in other application without the need to scale on surface, need first the iron scale of Surfaces of Hot Rolled Strip is removed, then carry out next step deep processing.In the removing method of iron scale, the general mode of pickling that adopts is carried out.The efficiency of pickling affects by steel surface iron scale thickness, structure, acid solution type, concentration and the factor such as acid liquor temperature, pickling time.Iron scale thickness is thinner, FeO content is more many in scale structure is more conducive to pickling, and the Fe contained in iron scale
2o
3then be unfavorable for pickling.
Through retrieval, denomination of invention is " a kind of production method subtracting pickling steel ", application number is the Chinese patent literature of 201110223714.5, it discloses a kind of production method subtracting pickling steel: its chemical composition is C is 0.025-0.065%, Si≤0.045%, Mn is that 0.15-0.25%, P are≤0.025%, S is≤0.01%, Als is 0.015-0.025%.The technological process of production adopted is: continuously cast bloom → process furnace heating → roughing → finish rolling → batch, billet heating temperature is 1180-1220 DEG C, hot rolling roughing start rolling temperature 1150-1250 DEG C, entry temperature at finishing 980-1030 DEG C, finish rolling finishing temperature 870-890 DEG C, coiling temperature 600-650 DEG C.In the production process of whole steel, have employed higher Heating temperature and rolling and coiling temperature, in the production method of this employing heat, rolling, its negative effect is mainly the following aspects: 1) high Heating temperature causes energy consumption to increase; 2) high Heating temperature causes the scaling loss of metal to increase, and reduces the lumber recovery of product; 3) high rolling temperature easily causes strip surface quality defect, especially for mild steel, often causes plate face to be pressed into scale defect; 4) high rolling temperature easily causes roll wear serious, and causing roller to consume on the one hand increases, and also result in the mass defect in plate face on the other hand; 5) high finishing temperature causes plate face iron scale thickness to increase, thus difficult or increase acid consumption when causing follow-up pickling.
Summary of the invention
The object of the invention is to the deficiency overcoming prior art existence, under a kind of prerequisite ensureing mechanical property of steel plate is provided, realize cost and at least can reduce by 10%, and the easy pickling steel easily removed by the structure changing surface of steel plate iron scale and production method thereof.
Realize the measure of above-mentioned purpose:
A kind of easily pickling steel, its chemical composition and weight percent content are: C:0.068 ~ 0.097%, Si :≤0.03%, Mn:0.27 ~ 0.60%, P :≤0.015%, S :≤0.010%, Als:0.028 ~ 0.050%, N :≤0.005%, surplus is Fe and is inevitably mingled with.
Produce a kind of method of easy pickling steel, its step:
1) desulfurizing iron is adopted;
2) converter smelting continuous casting becomes base;
3) to strand heating, control charging temperature at 100 ~ 800 DEG C, heat-up time 100 ~ 200min, heating and temperature control is at 1000 ~ 1200 DEG C;
4) carry out roughing, control roughing finishing temperature 950 ~ 1040 DEG C, control rough rolling step total reduction and be not less than 80%, in rough rolling process, adopt high-pressure water descaling at least 2 times;
5) carry out finish rolling, and control finish rolling start rolling temperature at 900 ~ 1000 DEG C, finish rolling finishing temperature is at 800 ~ 860 DEG C, and finish rolling total reduction is not less than 90%; The cold mode of limit edging is taked: when rolling temperature is within 950 ~ 1000 DEG C in finishing stands, the open degree of water coolant is not less than 50%, when rolling temperature is lower than 950 DEG C, the open degree of water coolant is not less than 10%, controls strip crown≤40 μm at the end of finish rolling;
6) carry out section cooling, control laminar flow speed of cooling and be not less than 5 DEG C/S;
7) batch, control coiling temperature at 550 ~ 600 DEG C or 200 ~ 450 DEG C;
8) stand-by.
The effect that in the present invention, each element and main technologic parameters control
C: solution strengthening element, improves the intensity of steel matrix;
Si: solution strengthening element, can improve the intensity of steel matrix, is easy to form at steel surface the Fe2SiO4 structure being difficult to remove time higher, causes surface defects;
Mn: solution strengthening element, improves the intensity of steel;
Als: reduce the oxygen level in steel, a certain amount of Als is conducive to the control of iron scale;
P: impurity element, lower content is conducive to the control of iron scale;
S: impurity element, lower content is conducive to the control of iron scale;
N: impurity element, lower content is conducive to the control of iron scale.
Mode about taking limit edging cold in finishing stands:
About coiling temperature: coiling temperature is controlled, at 200 ~ 450 DEG C or 550 ~ 600 DEG C, effectively to improve the structure of surface of steel plate iron scale, even if FeO rolls up, reduce thickness of scale on surface, iron scale is easily removed, ensures plate surface quality, and acid consumption can be reduced.
The present invention compared with prior art, steel product scale on surface thin and in iron scale FeO content higher, avoid the blocked up and Fe of edge iron scale
2o
3generation, obtain the scale structure of easy pickling, effectively can reduce the acid consumption of acid washing rolled steel, improve the efficiency of pickling and board surface quality; Adopt low-temperature short-time heating and the method for low temperature rolling, avoid conventional high-temperature long time heating and the energy consumption brought of rolling is large, oxidization burning loss seriously, lumber recovery is lower, roll wear is serious, oxidation defect incidence is higher drawback; In the operation of rolling, switchboard convexity≤40 μm are conducive to improving plate face iron scale homogeneity, and minimizing steel edge portion iron scale is blocked up and generate Fe
2o
3etc. difficult pickling oxide compound, improve pickling efficiency more than 15%; Adopt two kinds of coiling temperatures, effectively avoid FeO eutectoid fast transition humidity province (450 ~ 550 DEG C, FeO fast transition district), effectively improve the FeO content in iron scale;
(5) finish rolling hot stage F1 ~ F5 of the present invention makes total reduction > 90%, effectively improves the amount of rolling in steel austenite recrystallization district, is conducive to obtaining uniform microtexture.Adopt little draught at cold zone F6 ~ F7, the residual strain of steel can be reduced, the steel strength of reduction.Water coolant between frame is opened in finish rolling effectively can suppress the growth of surface of low-carbon steel iron scale, reduces the thickness of iron scale.
(6) the present invention is owing to have employed low temperature rolling, and the embedability scale on surface defect brought by high temperature rolling reduces greatly, and the wearing and tearing of roll also reduce greatly in addition.
Embodiment
Below the present invention is described in detail:
Embodiment 1
A kind of easily pickling steel, its chemical composition and weight percent content are: C:0.068%, Si:0.028%, Mn:0.36%, P:0.013%, S:0.009%, Als:0.028%, N:0.005%, and surplus is Fe and is inevitably mingled with.
Its production stage:
1) desulfurizing iron is adopted;
2) converter smelting continuous casting becomes base;
3) to strand heating, charging temperature at 100 ~ 200 DEG C, heat-up time 198min, Heating temperature is at 1000 ~ 1030 DEG C;
4) carry out roughing, roughing finishing temperature 950 ~ 970 DEG C, rough rolling step total reduction 82%, in rough rolling process, adopt high-pressure water descaling 2 times, surface of steel plate is without squama;
5) carry out finish rolling, finish rolling start rolling temperature at 900 ~ 920 DEG C, finish rolling finishing temperature at 800 ~ 820 DEG C, finish rolling total reduction 91%; The cold mode of limit edging is taked: because rolling temperature is lower than 950 DEG C, therefore the open degree of water coolant is 15%, the strip crown at the end of finish rolling 40 μm in finishing stands;
6) section cooling is carried out, section cooling speed 10 DEG C/S;
7) batch, control coiling temperature at 205 ~ 210 DEG C;
8) stand-by.
Through at room temperature testing to the every mechanical property of low-carbon hot-rolled steel and iron scale, the yield strength of its steel plate is 300MPa, tensile strength is 400MPa, unit elongation is 35%, surface of steel plate non-oxidation iron sheet defect exists, the thickness of surface of steel plate iron scale is 4.0 μm, and in scale structure, FeO accounts for 62% of its volume.
Embodiment 2
A kind of easily pickling steel, its chemical composition and weight percent content are: C:0.073%, Si:0.025%, Mn:0.27%, P:0.012%, S:0.0085%, Als:0.033%, N:0.004%, and surplus is Fe and is inevitably mingled with.
Its production stage:
1) desulfurizing iron is adopted;
2) converter smelting continuous casting becomes base;
3) to strand heating, charging temperature at 210 ~ 220 DEG C, heat-up time 165min, Heating temperature is at 1060 ~ 1080 DEG C;
4) carry out roughing, roughing finishing temperature 965 ~ 985 DEG C, rough rolling step total reduction 84%, in rough rolling process, adopt high-pressure water descaling 3 times, surface of steel plate is without squama;
5) carry out finish rolling, finish rolling start rolling temperature at 925 ~ 935 DEG C, finish rolling finishing temperature at 815 ~ 835 DEG C, finish rolling total reduction 92%; The cold mode of limit edging is taked: because rolling temperature is within 950 DEG C, therefore the open degree of water coolant is 30%, the strip crown at the end of finish rolling 36 μm in finishing stands;
6) carry out section cooling, section cooling speed is 15 DEG C/S;
7) batch, control coiling temperature at 255 ~ 265 DEG C;
8) stand-by.
Through at room temperature testing to the every mechanical property of low-carbon hot-rolled steel and iron scale, the yield strength of its steel plate is 280MPa, tensile strength is 430MPa, unit elongation is 36%, surface of steel plate non-oxidation iron sheet defect exists, the thickness of iron scale 4.5 μm, in scale structure, FeO accounts for 58% of its volume.
Embodiment 3
A kind of easily pickling steel, its chemical composition and weight percent content are: C:0.097%, Si:0.021%, Mn:0.46%, P:0.013%, S:0.0095%, Als:0.041%, N:0.0035%, and surplus is Fe and is inevitably mingled with.
Its production stage:
1) desulfurizing iron is adopted;
2) converter smelting continuous casting becomes base;
3) to strand heating, charging temperature at 500 ~ 510 DEG C, heat-up time 120min, Heating temperature is at 1120 ~ 1130 DEG C;
4) carry out roughing, roughing finishing temperature 1030 ~ 1040 DEG C, rough rolling step total reduction 83%, in rough rolling process, adopt high-pressure water descaling 2 times, surface of steel plate is without squama;
5) carry out finish rolling, finish rolling start rolling temperature at 955 ~ 975 DEG C, finish rolling finishing temperature at 855 ~ 860 DEG C, finish rolling total reduction 95%; The cold mode of limit edging is taked: because rolling temperature is higher than 950 DEG C, therefore the open degree of water coolant is 50%, the strip crown at the end of finish rolling 32 μm in finishing stands;
6) carry out section cooling, section cooling speed is 16 DEG C/S;
7) batch, control coiling temperature at 430 ~ 450 DEG C;
8) stand-by.
Through at room temperature testing to the every mechanical property of low-carbon hot-rolled steel and iron scale, the yield strength of its steel plate is 280MPa, tensile strength is 390MPa, unit elongation is 40%, surface of steel plate non-oxidation iron sheet defect exists, the thickness of surface of steel plate iron scale 5.0 μm, in scale structure, FeO accounts for 40% of its volume.
Embodiment 4
A kind of easily pickling steel, its chemical composition and weight percent content are: C:0.089%, Si:0.022%, Mn:0.6 %, P:0.011%, S:0.008%, Als:0.05%, N:0.0032%, and surplus is Fe and is inevitably mingled with.
Its production stage:
1) desulfurizing iron is adopted;
2) converter smelting continuous casting becomes base;
3) to strand heating, charging temperature at 600 ~ 620 DEG C, heat-up time 100min, Heating temperature is at 1165 ~ 1175 DEG C;
4) carry out roughing, roughing finishing temperature 1005 ~ 1025 DEG C, rough rolling step total reduction 86%, in rough rolling process, adopt high-pressure water descaling 2 times, surface of steel plate is without squama;
5) carry out finish rolling, finish rolling start rolling temperature at 990 ~ 1010 DEG C, finish rolling finishing temperature at 840 ~ 860 DEG C, finish rolling total reduction 96%; In finishing stands, take the cold mode of limit edging: because rolling temperature is more than 950 DEG C, therefore be 60% by the open degree of water coolant, the strip crown at the end of finish rolling 28 μm;
6) carry out section cooling, section cooling speed is 17 DEG C/S;
7) batch, control coiling temperature at 585 ~ 595 DEG C;
8) stand-by.
Through at room temperature testing to the every mechanical property of low-carbon hot-rolled steel and iron scale, the yield strength of its steel plate is 280MPa, tensile strength is 430MPa, unit elongation is 36%, surface of steel plate non-oxidation iron sheet defect exists, the thickness of iron scale 5.5 μm, in scale structure, FeO accounts for 30% of its volume.
Embodiment 5: a kind of easily pickling steel, its chemical composition and weight percent content are: C:0.079%, Si:0.020%, Mn:0.51 %, P:0.011%, S:0.008%, Als:0.043%, N:0.0025%, and surplus is Fe and is inevitably mingled with.
Its production stage: 1) adopt desulfurizing iron;
2) converter smelting continuous casting becomes base;
3) to strand heating, charging temperature at 590 ~ 600 DEG C, heat-up time 120min, Heating temperature is at 1190 ~ 1200 DEG C;
4) carry out roughing, roughing finishing temperature 995 ~ 1005 DEG C, rough rolling step total reduction 86%, in rough rolling process, adopt high-pressure water descaling 3 times, surface of steel plate is without squama;
5) carry out finish rolling, finish rolling start rolling temperature at 960 ~ 980 DEG C, finish rolling finishing temperature at 800 ~ 820 DEG C, finish rolling total reduction 93%; The cold mode of limit edging is taked: because rolling temperature is more than 950 DEG C, therefore the open degree of water coolant is 55%, the strip crown at the end of finish rolling 28 μm in finishing stands;
6) carry out section cooling, section cooling speed is 20 DEG C/S;
7) batch, control coiling temperature at 550 ~ 560 DEG C;
8) stand-by.
Through at room temperature testing to the every mechanical property of low-carbon hot-rolled steel and iron scale, the yield strength of its steel plate is 330MPa, tensile strength is 380MPa, unit elongation is 36%, surface of steel plate non-oxidation iron sheet defect exists, the thickness of iron scale 6.3 μm, in scale structure, FeO accounts for 35% of its volume.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (1)
1. produce a kind of method of easy pickling steel, its step:
1) desulfurizing iron is adopted;
2) converter smelting continuous casting becomes base; Its chemical composition and weight percent content are: C:0.068 ~ 0.079% or 0.089 ~ 0.097%, Si:0.02 ~ 0.028%, Mn:0.27 ~ 0.460% or 0.6%, P :≤0.015%, S :≤0.010%, Als:0.028 ~ 0.033%, N :≤0.005%, surplus is Fe and is inevitably mingled with;
3) to strand heating, control charging temperature at 100 ~ 800 DEG C, heat-up time 100 ~ 200min, heating and temperature control is at 1000 ~ 1190 DEG C;
4) carry out roughing, control roughing finishing temperature 950 ~ 1030 DEG C, control rough rolling step total reduction and be not less than 80%, in rough rolling process, adopt high-pressure water descaling at least 2 times;
5) carry out finish rolling, and control finish rolling start rolling temperature at 900 ~ 1000 DEG C, finish rolling finishing temperature is at 800 ~ 840 DEG C, and finish rolling total reduction is not less than 90%; The cold mode of limit edging is taked: when rolling temperature is within 950 ~ 1000 DEG C in finishing stands, the open degree of water coolant is not less than 50%, when rolling temperature is lower than 950 DEG C, the open degree of water coolant is not less than 10%, controls strip crown≤40 μm at the end of finish rolling;
6) carry out section cooling, control laminar flow speed of cooling and be not less than 5 DEG C/S;
7) batch, control coiling temperature at 585 ~ 600 DEG C or 200 ~ 450 DEG C;
8) stand-by.
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| CN201210435101.2A CN102925791B (en) | 2012-11-05 | 2012-11-05 | Steel easy to pickle and production method of steel |
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| CN102925791B true CN102925791B (en) | 2015-01-07 |
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| JP6139943B2 (en) * | 2013-03-29 | 2017-05-31 | 株式会社神戸製鋼所 | Steel material for soft magnetic parts with excellent pickling properties, soft magnetic parts with excellent corrosion resistance and magnetic properties, and manufacturing method thereof |
| WO2016152870A1 (en) * | 2015-03-23 | 2016-09-29 | 新日鐵住金株式会社 | Hot-rolled steel sheet and manufacturing method of same, and manufacturing method of cold-rolled steel sheet |
| CN107287516B (en) * | 2017-06-09 | 2019-04-23 | 唐山不锈钢有限责任公司 | Inexpensive automobile structural steel SAPH400 and its production method |
| CN109097700B (en) * | 2018-09-26 | 2020-09-11 | 马鞍山钢铁股份有限公司 | Low-carbon steel plate easy to pickle in CSP process and manufacturing method thereof |
| CN109940043B (en) * | 2019-04-09 | 2020-07-03 | 唐山市德龙钢铁有限公司 | Preparation method of hot rolled strip steel easy to pickle |
| CN112760554A (en) * | 2019-10-21 | 2021-05-07 | 宝山钢铁股份有限公司 | High-strength steel with excellent ductility and manufacturing method thereof |
| CN111575465A (en) * | 2020-05-13 | 2020-08-25 | 武汉钢铁有限公司 | Production method for preventing surface of hot-rolled pickled steel from blackening |
| CN112872064B (en) * | 2020-12-29 | 2022-10-11 | 天津市新天钢联合特钢有限公司 | Control process for iron scale of low-carbon hot-rolled narrow strip steel for pickling |
| CN113290047A (en) * | 2021-05-21 | 2021-08-24 | 新余钢铁股份有限公司 | Processing method of low-carbon acid-washing steel substrate |
| CN113877963B (en) * | 2021-09-28 | 2024-02-13 | 日照钢铁控股集团有限公司 | Control method for pressing oxide scale on surface of hot rolled silicon controlled steel strip |
| CN115896610B (en) * | 2022-09-30 | 2024-02-13 | 德龙钢铁有限公司 | Preparation method of strip steel for hot-rolled guardrail plate easy to acid wash |
| CN115747666B (en) * | 2023-01-10 | 2023-06-23 | 山西建龙实业有限公司 | Low-carbon hot-rolled pickled steel and control method for transverse crease defect of steel strip thereof |
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| JP3390583B2 (en) * | 1995-08-31 | 2003-03-24 | 川崎製鉄株式会社 | Hot rolled steel sheet and method for producing the same |
| JP2004314075A (en) * | 2004-06-17 | 2004-11-11 | Nissin Electric Co Ltd | Method for designing discharging pipe of discharge gas treating device |
| CN102676938B (en) * | 2012-05-31 | 2014-04-30 | 武汉钢铁(集团)公司 | Pickling-free steel coil with even iron sheet on surface and manufacture method thereof |
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