CN102586664A - Production method of hot-rolled no-fold low carbon steel - Google Patents
Production method of hot-rolled no-fold low carbon steel Download PDFInfo
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- CN102586664A CN102586664A CN2012100474032A CN201210047403A CN102586664A CN 102586664 A CN102586664 A CN 102586664A CN 2012100474032 A CN2012100474032 A CN 2012100474032A CN 201210047403 A CN201210047403 A CN 201210047403A CN 102586664 A CN102586664 A CN 102586664A
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Abstract
The invention provides a production method of hot-rolled no-fold low carbon steel, comprising the following steps of: smelting, wherein for non-cold-rolled steel with thickness more than 2mm, increasing the content of C in molten steel is increased by 0.01-0.17% by weight on the basis of the C content of a produced steel ball, and for cold rolled steel and non-cold-rolled steel with thickness less than or equal to 2mm, the contents of C and Mn are not needed to be adjusted; performing continuous casting and rolling; and coiling, wherein for the non-cold-rolled steel with thickness more than 2mm, the coiling temperature is increased by 1-3% on the basis of the existing set coiling temperature of the produced steel ball, and for the non-cold-rolled steel with thickness less than or equal to 2mm, flattening is performed. Compared with the prior art, the contents of C and Mn in the molten steel, and the coiling temperature of rolled steel are adjusted for the non-cold-rolled steel with thickness more than 2mm provided by the invention, so that the defect that the coiled steel is easy to fold when being uncoiled is eliminated, user requirements are met, the product yield is improved and the measures are simple and easy to implement.
Description
Technical field
The present invention relates to the working method of soft steel, specifically belong to the working method that hot rolling does not have wrinkle soft steel.
Background technology
In the mild steel plate of producing with the CSP hot rolling at present; In factory during quality inspection; Indexs such as its outward appearance, performance, composition are through the quality test National standard, but well-regulated creasing appears in discovery coil of strip surface after treating user's uncoiling, promptly is called the wrinkle defective; The user often proposes quality objection for this reason, and wrinkle quality objection rate is up to 10.24%.Control CSP hot rolling wrinkle defective method all adopts carbon, the manganese in the adjustment steel and improves the hot rolling reeling method of temperature at present.
Find in the production: ys is lower, the hot rolled coil of thinner thickness, and the wrinkle phenomenon takes place the low-carbon (LC) steel grade that unit elongation is bigger easily.It is because the generation of " Ke Shi air mass " hinders the startup of slippage that wrinkle produce, and causes material when being out of shape, upper and lower yield-point occurring and formed " Lv De silk ribbon " phenomenon.Produce hindering slippage and each user, specifically to open flat equipment relevant, controls relevantly but upper and lower yield-point and the design of steel-making composition, rolling temperature technology and the template of product line appear in material when distortion, and Here it is controls the foundation of wrinkle defective.Statistical results show is produced line at CSP, and the coil of strip that thickness≤4.0mm straight carbon steel finishing is produced does not produce the wrinkle defective, explains through the finishing production line and can eliminate the wrinkle defective.The product that wrinkle take place is not for passing through the thick low-carbon (LC) of finishing production line 2.0-4.0mm (C＜0.07%) coil of strip.Because CSP production line (CSP) is compared with conventional production lines; Have that slab is thin, speed of cooling is fast; Crystal grain is thin; Advantages of high strength is considered CSP continuous caster funnel-type crystallizer and the fast influence of continuous casting pulling rate simultaneously, will avoid peritectic steel scope (C:0.07-0.16%) during the composition design.In satisfying the GB scope; Adopt the close limit composition of carbon≤0.07%; Although the product performance National standard, meet internal control delivery standard (ys>=235Mpa, tensile strength 370～500Mpa, unit elongation>=26%), ys lower (minimum 255Mp, the ratio 20-25% of≤295Mp); Unit elongation is bigger, has caused in fact taking place easily " mild steel " of wrinkle phenomenon.
Summary of the invention
The objective of the invention is to overcome above-mentioned deficiency; Provide a kind of ability through carbon, manganese content in the adjustment molten steel; And adjustment steel rolling coiling temperature, coil of strip is smooth and eliminate coil of strip and open the wrinkle defective of easy generation, satisfies customer requirements, improves the working method of the no wrinkle soft steel of product percent of pass.
Realize the measure of above-mentioned purpose:
A kind of hot rolling does not have the working method of wrinkle soft steel, its step:
1) smelt:
Non-CRS for product thickness＞2 millimeter: the weight percent content of C increases by 0.01%～0.17% weight percent in the control molten steel on the basis of the steel grade of being produced, but the value after increasing is no more than the higher limit of this steel grade standard code; The weight percent content of Mn upper and lower adjustment 0.05%～1.0% weight percent on the basis of the steel grade of being produced in the molten steel, but adjusted value must not surpass the upper limit value and lower limit value of this steel grade standard code; The content adjustment of its C and Mn is to satisfy ys in 295～430Mpa scope;
For the non-CRS of CRS and thickness≤2 millimeter, the content of C and Mn need not adjustment;
2) carry out continuous casting and rolling;
3) batch:
For the non-CRS of product thickness＞2 millimeter, the controlling valu of its coiling temperature improves 1%～3% on the basis of the existing curling temperature of setting of the steel grade of being produced;
Non-CRS for CRS and thickness≤2 millimeter need not to improve its coiling temperature;
4) carry out smooth to the non-CRS of producing thickness≤2 millimeter.
The present invention compared with prior art; For the non-CRS of product thickness＞2 millimeter through carbon, manganese content in the adjustment molten steel; And adjustment steel rolling coiling temperature and eliminate the wrinkle defective that coil of strip is opened easy generation, open the wrinkle defective of easy generation for non-CRS, the cold-rolled steel of producing thickness≤2 millimeter through smooth, cold rolling elimination coil of strip, thereby satisfied customer requirements; Improved product percent of pass, measure is simple.
Embodiment
Describe in detail in the face of the present invention down:
Embodiment 1
The present embodiment trade mark that manufactures a finished product is the steel grade of Q235B, and the weight percent content of its former C is 0.032%, and the weight percent content of its former Mn is 0.33%, and the curling temperature of its former setting is 560 ℃, and product thickness is 1.75 millimeters.
Its step:
1) smelt:
Because the thickness of producing is≤2 millimeters non-CRS, so the content of C and Mn need not adjustment;
2) carry out continuous casting and rolling;
3) batch:
Because the thickness of producing is 1.75 millimeters non-CRS, so need not to improve its coiling temperature;
4) carry out smooth.
Its steel of producing quality inspection after uncoiling does not find that there is the wrinkle defective in it.
Embodiment 2
The present embodiment trade mark that manufactures a finished product is the steel grade of Q235B; The weight percent content of its former C is 0.032%, and the weight percent content of its former Mn is 0.33%, and the curling temperature of its former setting is 660 ℃; Product thickness is 2.75 millimeters; The weight percent content higher limit of the C of this steel grade standard code is 0.20%, and the weight percent upper limit content of Mn is 0.55%, and the weight percent lower limit content of Mn is 0.10%.
Its step:
1) smelt:
Because the product thickness of producing is 2.75 millimeters the non-CRS of Q235B: the weight percent content of former C is 0.032%, so increase the weight percent of 0.15%C on this basis, the weight percent content of its C is 0.182%; The weight percent content of Mn is 0.33% in the former molten steel, reduces by 0.05% weight percent to 0.28% on this basis, does not surpass the lower value of this steel grade standard code; Its ys is brought up to 305Mpa by 255Mpa;
2) carry out continuous casting and rolling;
3) batch:
Because it is the non-CRS of 2.75 millimeters thickness, its coiling temperature is to improve 2% on 660 ℃ of bases in the curling temperature of former setting, and its coiling temperature is 673 ℃;
Because the thickness of producing is 2.75 millimeters non-CRS, so need not to carry out smooth.
The steel uncoiling that it is produced is not after quality inspection finds that there is the wrinkle defective in it.
Embodiment 3
The present embodiment trade mark that manufactures a finished product is the steel grade of Q235B; The weight percent content of its former C is 0.052%, and the weight percent content of its former Mn is 0.33%, and the curling temperature of its former setting is 660 ℃; Product thickness is 2.30 millimeters; The weight percent content higher limit of the C of this steel grade standard code is 0.20%, and the weight percent upper limit content of Mn is 0.55%, and the weight percent lower limit content of Mn is 0.10%.
Its step:
1) smelt:
Because the product thickness of producing is 3.75 millimeters the non-CRS of Q235A: the weight percent content of former C is 0.052%, so increase the weight percent of 0.10%C on this basis, the weight percent content that makes its C is 0.152%; The weight percent content of Mn is 0.33% in the former molten steel, increases by 0.20% weight percent to 0.53% on this basis, does not surpass the higher limit of this steel grade standard code; Its ys is brought up to 310Mpa by 265Mpa;
2) carry out continuous casting and rolling;
3) batch:
Because it is the non-CRS of 3.75 millimeters thickness, its coiling temperature is to improve 3% on 660 ℃ of bases in the curling temperature of former setting, and coiling temperature is 680.0 ℃;
Because the thickness of producing is 3.75 millimeters non-CRS, so need not to carry out smooth.
The steel uncoiling that it is produced is not after quality inspection finds that there is the wrinkle defective in it.
Embodiment 4
The present embodiment trade mark that manufactures a finished product is the steel grade of Q235A, and the weight percent content of its former C is 0.05%, and the weight percent content of its former Mn is 0.39%, and the curling temperature of its former setting is 660 ℃, and product thickness is 3.75 millimeters; The weight percent content higher limit of the C of this steel grade standard code is 0.20%, and the weight percent upper limit content of Mn is 0.55%, and the weight percent lower limit content of Mn is 0.1%.
Its step:
1) smelt:
Because the product thickness of producing is 3.75 millimeters the non-CRS of Q235A: the weight percent content of former C is 0.05%, so increase the weight percent of 0.12%C on this basis, the weight percent content that makes its C is 0.17%; The weight percent content of Mn is 0.39% in the former molten steel, increases by 0.05% weight percent to 0.44% on this basis, does not surpass the higher limit of this steel grade standard code; Its ys is brought up to 316Mpa by 275Mpa;
2) carry out continuous casting and rolling;
3) batch:
Because it is the non-CRS of 3.75 millimeters thickness, its coiling temperature is to improve 1% on 660 ℃ of bases in the curling temperature of former setting, and coiling temperature is 666.6 ℃;
Because the thickness of producing is 3.75 millimeters non-CRS, so need not to carry out smooth.
The steel uncoiling that it is produced is not after quality inspection finds that there is the wrinkle defective in it.
Embodiment 5
The present embodiment trade mark that manufactures a finished product is the steel grade of SPHC, and the weight percent content of its former C is 0.045%, and the weight percent content of its former Mn is 0.20%, and the curling temperature of its former setting is 640 ℃, and product thickness is 2.30 millimeters; The weight percent content higher limit of the C of this steel grade standard code is 0.065%, and the weight percent upper limit content of Mn is 0.40%, and the weight percent lower limit content of Mn is 0.10%.
Its step:
1) smelt:
Because the product thickness of producing is 2.30 millimeters a SPHC cold-rolled steel: so the content of C and Mn need not adjustment;
2) carry out continuous casting and rolling;
3) batch:
Because the thickness of producing is 2.30 millimeters SPHC cold-rolled steel, so need not to improve its coiling temperature;
4) be CRS owing to what produce, so need be through smooth (the wrinkle defective effect of eliminating because of cold rolling back is not the same with smooth effect);
The user carries out that routine is cold rolling to get final product.
Its steel of producing does not find that through quality inspection there is the wrinkle defective in it.
The product of the foregoing description is not all found to be produced by the wrinkle defective, thereby has been satisfied customer requirements through the uncoiling quality inspection.
Claims (1)
1. a hot rolling does not have the working method of wrinkle soft steel, its step:
1) smelt:
Non-CRS for product thickness＞2 millimeter: the weight percent content of C increases by 0.01%～0.17% weight percent in the control molten steel on the basis of the steel grade of being produced, but the value after increasing is no more than the higher limit of this steel grade standard code; The weight percent content of Mn upper and lower adjustment 0.05%～1.0% weight percent on the basis of the steel grade of being produced in the molten steel, but adjusted value must not surpass the upper limit value and lower limit value of this steel grade standard code; The content adjustment of its C and Mn is to satisfy ys in 295～430Mpa scope;
For the non-CRS of CRS and thickness≤2 millimeter, the content of C and Mn need not adjustment;
2) carry out continuous casting and rolling;
3) batch:
For the non-CRS of product thickness＞2 millimeter, the controlling valu of its coiling temperature improves 1%～3% on the basis of the existing curling temperature of setting of the steel grade of being produced;
Non-CRS for CRS and thickness≤2 millimeter need not to improve its coiling temperature;
4) carry out smooth to the non-CRS of producing thickness≤2 millimeter.
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| CN 201210047403 CN102586664B (en) | 2012-02-28 | 2012-02-28 | Production method of hot-rolled no-fold low carbon steel |
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| CN 201210047403 CN102586664B (en) | 2012-02-28 | 2012-02-28 | Production method of hot-rolled no-fold low carbon steel |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1864879A (en) * | 2006-06-06 | 2006-11-22 | 湖南华菱涟源钢铁有限公司 | Method for producing semi-process cold-rolled silicon steel by sheet billet continuous casting and rolling process |
| CN101144113A (en) * | 2007-08-20 | 2008-03-19 | 马鞍山钢铁股份有限公司 | Technique for producing deep-drawing cold-rolled plate based on CSP technique |
| CN101343677A (en) * | 2008-09-01 | 2009-01-14 | 湖南华菱涟源钢铁有限公司 | Production method of low-silicon low-carbon deep drawing steel |
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- 2012-02-28 CN CN 201210047403 patent/CN102586664B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1864879A (en) * | 2006-06-06 | 2006-11-22 | 湖南华菱涟源钢铁有限公司 | Method for producing semi-process cold-rolled silicon steel by sheet billet continuous casting and rolling process |
| CN101144113A (en) * | 2007-08-20 | 2008-03-19 | 马鞍山钢铁股份有限公司 | Technique for producing deep-drawing cold-rolled plate based on CSP technique |
| CN101343677A (en) * | 2008-09-01 | 2009-01-14 | 湖南华菱涟源钢铁有限公司 | Production method of low-silicon low-carbon deep drawing steel |
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Effective date of registration: 20170711 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |
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Granted publication date: 20130522 Termination date: 20200228 |