CN102925791A - 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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- CN102925791A CN102925791A CN2012104351012A CN201210435101A CN102925791A CN 102925791 A CN102925791 A CN 102925791A CN 2012104351012 A CN2012104351012 A CN 2012104351012A CN 201210435101 A CN201210435101 A CN 201210435101A CN 102925791 A CN102925791 A CN 102925791A
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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 particularly a kind of easy pickling steel and production method thereof.
Background technology
Hot rolled strip carry out cold rolling before or need not in the application of scale on surface at other, need first the iron scale of Surfaces of Hot Rolled Strip to be removed, then carry out next step deep processing.In the removing method of iron scale, generally adopt the mode of pickling to carry out.The efficient of pickling is subjected to the factor affecting such as steel surface iron scale thickness, structure, acid solution type, concentration and acid liquor temperature, pickling time.Iron scale thickness is thinner, FeO content is more many in the scale structure more is conducive to pickling, and the Fe that contains in the iron scale
2O
3Then be unfavorable for pickling.
Through retrieval, denomination of invention is that " a kind of production method that subtracts the pickling steel ", application number are 201110223714.5 Chinese patent literature, and it discloses a kind of production method that subtracts the pickling steel: its chemical ingredients is that C is that 0.025-0.065%, Si≤0.045%, Mn are 0.15-0.25%, P for≤0.025%, S for≤0.01%, Als is 0.015-0.025%.The technological process of production that adopts is: continuously cast bloom → process furnace heating → roughing → finish rolling → batch, billet heating temperature is 1180-1220 ℃, 1150-1250 ℃ of hot rolling roughing start rolling temperature, 980-1030 ℃ of finish rolling temperature in, 870-890 ℃ of finish rolling finishing temperature, coiling temperature 600-650 ℃.In the production process of whole steel, higher Heating temperature and rolling and coiling temperature have been adopted, in this employing heat, rolling production method, its negative effect mainly is 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 causes the strip surface quality defect easily, especially for mild steel, often causes the plate face to be pressed into the iron scale defective; 4) it is serious that high rolling temperature causes roll wear easily, causes on the one hand the roller consumption to increase, and also caused on the other hand the mass defect of plate face; 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 overcome the deficiency that prior art exists, provide under a kind of prerequisite guaranteeing mechanical property of steel plate, realize that cost can reduce by 10% at least, and easy pickling steel and the production method thereof removed easily by the structure that changes the surface of steel plate iron scale.
Realize the measure of above-mentioned purpose:
A kind of easy pickling steel, its chemical ingredients 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 inevitably is mingled with.
Produce a kind of method of easy pickling steel, its step:
1) adopts desulfurizing iron;
2) converter smelting and continuous casting become base;
3) to strand heating, the control charging temperature is at 100 ~ 800 ℃, heat-up time 100 ~ 200min, heating and temperature control is at 1000 ~ 1200 ℃;
4) carry out roughing, 950 ~ 1040 ℃ of control roughing finishing temperatures, control rough rolling step total reduction is not less than 80%, adopts high-pressure water descaling at least 2 times in rough rolling process;
5) carry out finish rolling, and control the finish rolling start rolling temperature at 900 ~ 1000 ℃, the finish rolling finishing temperature is at 800 ~ 860 ℃, and the finish rolling total reduction is not less than 90%; In finishing stands, take the cold mode of limit edging: when rolling temperature is in 950 ~ 1000 ℃, the open degree of water coolant is not less than 50%, when rolling temperature was lower than 950 ℃, the open degree of water coolant was not less than 10%, the strip crown when control finish rolling finishes≤40 μ m;
6) carry out the laminar flow cooling, control laminar flow speed of cooling is not less than 5 ℃/S;
7) batch, the control coiling temperature is at 550 ~ 600 ℃ or 200 ~ 450 ℃;
8) stand-by.
The effect of each element and main technologic parameters control among the present invention
C: solution strengthening element, the intensity of raising steel matrix;
Si: the solution strengthening element, can improve the intensity of steel matrix, be easy to when higher form the Fe2SiO4 structure that is difficult to remove at steel surface, cause surface defects;
Mn: solution strengthening element, the intensity of raising steel;
Als: reduce the oxygen level in the 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.
About in finishing stands, taking the cold mode of limit edging:
About curling temperature: curling temperature is controlled at 200 ~ 450 ℃ or 550 ~ 600 ℃, can effectively improves the structure of surface of steel plate iron scale, even FeO rolls up, reduce thickness of scale on surface, iron scale is removed easily, guaranteed plate surface quality, and can reduce the acid consumption.
The present invention compared with prior art, FeO content is higher in the thin and iron scale of steel product scale on surface, has avoided the blocked up and Fe of limit section iron scale
2O
3Generation, obtain the scale structure of easy pickling, can effectively reduce the acid consumption of acid washing rolled steel, improve efficient and the plate face quality of pickling; Adopt the method for low-temperature short-time heating and low temperature rolling, when having avoided conventional high-temperature long heating and the rolling energy consumption of bringing is large, oxidization burning loss seriously, lumber recovery is lower, roll wear is serious, the oxidation defect incidence is higher drawback; Switchboard convexity in the operation of rolling≤40 μ m are conducive to improve plate face iron scale homogeneity, reduce the blocked up and generation Fe of steel edge portion iron scale
2O
3Etc. difficult pickling oxide compound, improve pickling efficient more than 15%; Adopt two kinds of coiling temperatures, effectively avoid FeO eutectoid fast transition humidity province (450 ~ 550 ℃ in FeO fast transition district), the FeO content in the Effective Raise iron scale;
(5) finish rolling hot stage F1 ~ F5 of the present invention makes total reduction＞90%, and the amount of rolling in Effective Raise steel austenite recrystallization district is conducive to obtain uniform microtexture.Adopt little draught at cold zone F6 ~ F7, can reduce the residual strain of steel, the steel strength of reduction.The growth that water coolant between frame can establishment surface of low-carbon steel iron scale is opened in finish rolling, reduces the thickness of iron scale.
(6) the present invention is owing to adopted low temperature rolling, and the embedability scale on surface defective of being brought by high temperature rolling reduces greatly, and the wearing and tearing of roll also reduce greatly in addition.
Embodiment
The below is described in detail the present invention:
Embodiment 1
A kind of easy pickling steel, its chemical ingredients 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%, surplus is Fe and inevitably is mingled with.
Its production stage:
1) adopts desulfurizing iron;
2) converter smelting and continuous casting become base;
3) to strand heating, charging temperature is at 100 ~ 200 ℃, heat-up time 198min, Heating temperature is at 1000 ~ 1030 ℃;
4) carry out roughing, 950 ~ 970 ℃ of roughing finishing temperatures, rough rolling step total reduction 82% adopts high-pressure water descaling 2 times in rough rolling process, and surface of steel plate is without squama;
5) carry out finish rolling, the finish rolling start rolling temperature is at 900 ~ 920 ℃, and the finish rolling finishing temperature is at 800 ~ 820 ℃, finish rolling total reduction 91%; In finishing stands, take the cold mode of limit edging: because rolling temperature is lower than 950 ℃, so the open degree of water coolant is 15%, the strip crown 40 μ m when finish rolling finishes;
6) carry out laminar flow cooling, 10 ℃/S of laminar flow speed of cooling;
7) batch, the control coiling temperature is at 205 ~ 210 ℃;
8) stand-by.
Through at room temperature the every mechanical property of low-carbon hot-rolled steel and iron scale being tested, 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 defective exists, the thickness of surface of steel plate iron scale is 4.0 μ m, and FeO accounts for 62% of its volume in scale structure.
Embodiment 2
A kind of easy pickling steel, its chemical ingredients 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%, surplus is Fe and inevitably is mingled with.
Its production stage:
1) adopts desulfurizing iron;
2) converter smelting and continuous casting become base;
3) to strand heating, charging temperature is at 210 ~ 220 ℃, heat-up time 165min, Heating temperature is at 1060 ~ 1080 ℃;
4) carry out roughing, 965 ~ 985 ℃ of roughing finishing temperatures, rough rolling step total reduction 84% adopts high-pressure water descaling 3 times in rough rolling process, and surface of steel plate is without squama;
5) carry out finish rolling, the finish rolling start rolling temperature is at 925 ~ 935 ℃, and the finish rolling finishing temperature is at 815 ~ 835 ℃, finish rolling total reduction 92%; In finishing stands, take the cold mode of limit edging: because rolling temperature is in 950 ℃, so the open degree of water coolant is 30%, the strip crown 36 μ m when finish rolling finishes;
6) carry out the laminar flow cooling, the laminar flow speed of cooling is 15 ℃/S;
7) batch, the control coiling temperature is at 255 ~ 265 ℃;
8) stand-by.
Through at room temperature the every mechanical property of low-carbon hot-rolled steel and iron scale being tested, 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 defective exists, the thickness 4.5 μ m of iron scale, FeO accounts for 58% of its volume in scale structure.
Embodiment 3
A kind of easy pickling steel, its chemical ingredients 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%, surplus is Fe and inevitably is mingled with.
Its production stage:
1) adopts desulfurizing iron;
2) converter smelting and continuous casting become base;
3) to strand heating, charging temperature is at 500 ~ 510 ℃, heat-up time 120min, Heating temperature is at 1120 ~ 1130 ℃;
4) carry out roughing, 1030 ~ 1040 ℃ of roughing finishing temperatures, rough rolling step total reduction 83% adopts high-pressure water descaling 2 times in rough rolling process, and surface of steel plate is without squama;
5) carry out finish rolling, the finish rolling start rolling temperature is at 955 ~ 975 ℃, and the finish rolling finishing temperature is at 855 ~ 860 ℃, finish rolling total reduction 95%; In finishing stands, take the cold mode of limit edging: because rolling temperature is higher than 950 ℃, so the open degree of water coolant is 50%, the strip crown 32 μ m when finish rolling finishes;
6) carry out the laminar flow cooling, the laminar flow speed of cooling is 16 ℃/S;
7) batch, the control coiling temperature is at 430 ~ 450 ℃;
8) stand-by.
Through at room temperature the every mechanical property of low-carbon hot-rolled steel and iron scale being tested, 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 defective exists, the thickness 5.0 μ m of surface of steel plate iron scale, FeO accounts for 40% of its volume in scale structure.
Embodiment 4
A kind of easy pickling steel, its chemical ingredients 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%, surplus is Fe and inevitably is mingled with.
Its production stage:
1) adopts desulfurizing iron;
2) converter smelting and continuous casting become base;
3) to strand heating, charging temperature is at 600 ~ 620 ℃, heat-up time 100min, Heating temperature is at 1165 ~ 1175 ℃;
4) carry out roughing, 1005 ~ 1025 ℃ of roughing finishing temperatures, rough rolling step total reduction 86% adopts high-pressure water descaling 2 times in rough rolling process, and surface of steel plate is without squama;
5) carry out finish rolling, the finish rolling start rolling temperature is at 990 ~ 1010 ℃, and the finish rolling finishing temperature is at 840 ~ 860 ℃, finish rolling total reduction 96%; In finishing stands, take the cold mode of limit edging: because rolling temperature is more than 950 ℃, thus be 60% with the open degree of water coolant, the strip crown 28 μ m when finish rolling finishes;
6) carry out the laminar flow cooling, the laminar flow speed of cooling is 17 ℃/S;
7) batch, the control coiling temperature is at 585 ~ 595 ℃;
8) stand-by.
Through at room temperature the every mechanical property of low-carbon hot-rolled steel and iron scale being tested, 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 defective exists, the thickness 5.5 μ m of iron scale, FeO accounts for 30% of its volume in scale structure.
Embodiment 5: a kind of easy pickling steel, and its chemical ingredients 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%, surplus is Fe and inevitably is mingled with.
Its production stage: 1) adopt desulfurizing iron;
2) converter smelting and continuous casting become base;
3) to strand heating, charging temperature is at 590 ~ 600 ℃, heat-up time 120min, Heating temperature is at 1190 ~ 1200 ℃;
4) carry out roughing, 995 ~ 1005 ℃ of roughing finishing temperatures, rough rolling step total reduction 86% adopts high-pressure water descaling 3 times in rough rolling process, and surface of steel plate is without squama;
5) carry out finish rolling, the finish rolling start rolling temperature is at 960 ~ 980 ℃, and the finish rolling finishing temperature is at 800 ~ 820 ℃, finish rolling total reduction 93%; In finishing stands, take the cold mode of limit edging: because rolling temperature is more than 950 ℃, so the open degree of water coolant is 55%, the strip crown 28 μ m when finish rolling finishes;
6) carry out the laminar flow cooling, the laminar flow speed of cooling is 20 ℃/S;
7) batch, the control coiling temperature is at 550 ~ 560 ℃;
8) stand-by.
Through at room temperature the every mechanical property of low-carbon hot-rolled steel and iron scale being tested, 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 defective exists, the thickness 6.3 μ m of iron scale, FeO accounts for 35% of its volume in scale structure.
Above-described embodiment only exemplifies for the best, and is not to be restriction to embodiments of the present invention.
Claims (2)
1. easy pickling steel, its chemical ingredients 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:0.028～0.05%, N :≤0.005%, surplus is Fe and inevitably is mingled with.
2. produce the method for a kind of easy pickling steel as claimed in claim 1, its step:
1) adopts desulfurizing iron;
2) converter smelting and continuous casting become base;
3) to strand heating, the control charging temperature is at 100 ~ 800 ℃, heat-up time 100 ~ 200min, heating and temperature control is at 1000 ~ 1200 ℃;
4) carry out roughing, 950 ~ 1040 ℃ of control roughing finishing temperatures, control rough rolling step total reduction is not less than 80%, adopts high-pressure water descaling at least 2 times in rough rolling process;
5) carry out finish rolling, and control the finish rolling start rolling temperature at 900 ~ 1000 ℃, the finish rolling finishing temperature is at 800 ~ 860 ℃, and the finish rolling total reduction is not less than 90%; In finishing stands, take the cold mode of limit edging: when rolling temperature is in 950 ~ 1000 ℃, the open degree of water coolant is not less than 50%, when rolling temperature was lower than 950 ℃, the open degree of water coolant was not less than 10%, the strip crown when control finish rolling finishes≤40 μ m;
6) carry out the laminar flow cooling, control laminar flow speed of cooling is not less than 5 ℃/S;
7) batch, the control coiling temperature is at 550 ~ 600 ℃ or 200 ~ 450 ℃;
8) stand-by.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105074034A (en) * | 2013-03-29 | 2015-11-18 | 株式会社神户制钢所 | Soft magnetic component steel material having excellent pickling properties, soft magnetic component having excellent corrosion resistance and magnetic properties, and production method therefor |
| CN107287516A (en) * | 2017-06-09 | 2017-10-24 | 唐山不锈钢有限责任公司 | Inexpensive automobile structural steel SAPH400 and its production method |
| CN107429343A (en) * | 2015-03-23 | 2017-12-01 | 新日铁住金株式会社 | The manufacture method of hot rolled steel plate, its manufacture method and cold-rolled steel sheet |
| CN109097700A (en) * | 2018-09-26 | 2018-12-28 | 马鞍山钢铁股份有限公司 | A kind of easy pickling mild steel steel plate of CSP process and its manufacturing method |
| CN109940043A (en) * | 2019-04-09 | 2019-06-28 | 唐山市德龙钢铁有限公司 | A kind of preparation method of easy pickled hot strip |
| 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 |
| 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 |
| CN112872064A (en) * | 2020-12-29 | 2021-06-01 | 天津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 |
| CN113877963A (en) * | 2021-09-28 | 2022-01-04 | 日照钢铁控股集团有限公司 | Control method for pressing in iron scale on surface of hot-rolled silicon-controlled strip steel |
| CN115747666A (en) * | 2023-01-10 | 2023-03-07 | 山西建龙实业有限公司 | Low-carbon hot-rolled pickled steel and control method for transverse crease mark defects of steel strip of low-carbon hot-rolled pickled steel |
| CN115896610A (en) * | 2022-09-30 | 2023-04-04 | 德龙钢铁有限公司 | Preparation method of strip steel for easy-pickling hot-rolled guardrail plate |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105074034A (en) * | 2013-03-29 | 2015-11-18 | 株式会社神户制钢所 | Soft magnetic component steel material having excellent pickling properties, soft magnetic component having excellent corrosion resistance and magnetic properties, and production method therefor |
| CN107429343A (en) * | 2015-03-23 | 2017-12-01 | 新日铁住金株式会社 | The manufacture method of hot rolled steel plate, its manufacture method and cold-rolled steel sheet |
| CN107429343B (en) * | 2015-03-23 | 2019-05-28 | 新日铁住金株式会社 | The manufacturing method of hot rolled steel plate, its manufacturing method and cold-rolled steel sheet |
| CN107287516A (en) * | 2017-06-09 | 2017-10-24 | 唐山不锈钢有限责任公司 | Inexpensive automobile structural steel SAPH400 and its production method |
| 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 |
| CN109097700A (en) * | 2018-09-26 | 2018-12-28 | 马鞍山钢铁股份有限公司 | A kind of easy pickling mild steel steel plate of CSP process and its manufacturing method |
| CN109940043A (en) * | 2019-04-09 | 2019-06-28 | 唐山市德龙钢铁有限公司 | A kind of preparation method of easy pickled hot strip |
| 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 |
| CN112872064A (en) * | 2020-12-29 | 2021-06-01 | 天津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 |
| 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 |
| CN113877963A (en) * | 2021-09-28 | 2022-01-04 | 日照钢铁控股集团有限公司 | Control method for pressing in iron scale on surface of hot-rolled silicon-controlled strip steel |
| 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 |
| CN115896610A (en) * | 2022-09-30 | 2023-04-04 | 德龙钢铁有限公司 | Preparation method of strip steel for easy-pickling hot-rolled guardrail plate |
| 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 |
| CN115747666A (en) * | 2023-01-10 | 2023-03-07 | 山西建龙实业有限公司 | Low-carbon hot-rolled pickled steel and control method for transverse crease mark defects of steel strip of low-carbon hot-rolled pickled steel |
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