CN105132819A - Continuous rolling method of low-chromium ferrite stainless steel - Google Patents
Continuous rolling method of low-chromium ferrite stainless steel Download PDFInfo
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- CN105132819A CN105132819A CN201510494899.1A CN201510494899A CN105132819A CN 105132819 A CN105132819 A CN 105132819A CN 201510494899 A CN201510494899 A CN 201510494899A CN 105132819 A CN105132819 A CN 105132819A
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Abstract
The invention relates to the field of rolling of stainless steel, in particular to a continuous rolling method of low-chromium ferrite stainless steel. The continuous rolling method of the low-chromium ferrite stainless steel selects proper steel coils; after the steel coils pass through an annealing process of a cover furnace, the tail parts of the previous steel coils and the head parts of the later steel coils are welded through a laser welder; after the acid washing, the steel coils are rolled by five rolling mills in sequence; the total deformation rate of the five rolling mills in the rolling process is 60-80%; and the rolling speed is 80-110 m/min. The method has the following beneficial effects: the rolling process is stable and smooth; no belt break accident is generated; and the performances of finished products after the rolling are equivalent to the performances of finished products rolled by single rolling mill, and are accordant with inner quality standards.
Description
Technical field
The present invention relates to rolled stainless steel field, specifically a kind of method of low chrome ferritic stainless steel continuous rolling.
Background technology
Low chrome ferritic stainless steel is that a class is cheap, atmospheric corrosion resistance and the excellent economical stainless steel of polishing machine.When single chassis rolling, the operation of rolling is steady.When stainless cold rolling mill continuous rolling production line examination rolling this kind of low chrome ferritic stainless steel, often there is broken belt accident.Broken belt accident can cause production line stop, and operating rate declines, and lumber recovery declines.
Summary of the invention
Technical problem to be solved by this invention is: how to achieve the smooth rolling of this kind of low chrome ferritic stainless steel on tandem rolling line.
The technical solution adopted in the present invention is: a kind of method of low chrome ferritic stainless steel continuous rolling, coil of strip composition is by weight percentage containing C≤0.030%, Si≤1.00%, Mn≤1.00%, P≤0.040%, S≤0.030%, Cr11 ~ 13.5%, Ni≤0.60%, N≤0.030%, all the other are Fe and inevitable impurity, coil of strip is by after batch annealing, the afterbody of last coil of strip and the stem of a rear coil of strip are passed through together with laser welder, after pickling, successively via five mill millings, five mill milling process total deformation rates are 60% ~ 80%, wherein the first mill milling process deformation rate is 25% ~ 30%, second mill milling process deformation rate is 21% ~ 26%, 3rd mill milling process deformation rate is 18% ~ 23%, 4th mill milling process deformation rate is 15% ~ 20%, 5th mill milling process deformation rate is 12% ~ 17%, roll speed is 80 ~ 110m/min.
As a kind of optimal way: annealing temperature is 680 DEG C ~ 780 DEG C, and soaking time is 10 hours, after insulation terminates, the type of cooling is for be chilled to ambient temperature soon.
The invention has the beneficial effects as follows: the operation of rolling is steady, smooth, and broken belt accident does not occur, the end properties rolling rear end properties and single mill milling is suitable, meets inner quality standard.
Embodiment
The principle of institute of the present invention foundation is: in continuous rolling process, and coil of strip and coil of strip pass through together with laser welder, successively via five mill millings; If former and later two coil of strip performance differences are comparatively large, under identical rolling pressure, the uneven thickness of coil of strip can be caused; Time again by next milling train, the change of thickness will cause rolling mill screwdown, speed, tension force generation saltus step, make when high speed cold tandem rolling roll gap respond cannot catch up with in time, due to inertia and the self-adjusting hysteresis quality of rolling load of continuous rolling, after weld seam, broken belt is occurring.Therefore, realize the continuous rolling of cold continuous rolling, except will ensureing raw material and there is no defect, good weldquality, also must ensure the stability of coil of strip mechanical property after annealing.
The present invention is the annealing process by changing hot rolling raw material coil of strip, namely changes batch annealing into by original continuous annealing process, selects suitable annealing temperature, soaking time and the type of cooling; Cold continuous rolling process is then deformation rate and the roll speed that will determine each frame, to reach the object of the steady rolling of tandem rolling line.
Embodiment 1
Low chrome ferritic stainless steel composition is: C:0.015%, Si:0.35%, Mn:0.25%, P:0.025%, S:0.005%, Cr:11.8%, Ni:0.05%, N:0.015%, and all the other are Fe and inevitable impurity;
Bell furnace holding temperature is 700 DEG C, soaking time 10 hours, and insulation terminates to be chilled to tapping temperature soon afterwards;
Hot rolled coil specification is 3.0mm, finished product cold rolled strip is 0.8mm, cold rolling total deformation rate is 80%, it be the 29.5%, second milling train deformation rate is that the 25.2%, the 3rd milling train deformation rate is milling train 21.7%, the 4th milling train deformation rate is milling train 18.3%, the 5th milling train deformation rate is milling train 15.8%, roll speed 86m/min that each milling train deformation rate is respectively the first milling train deformation rate;
The tandem rolling line operation of rolling is steady, and broken belt does not occur, and end properties meets inner quality standard.
End properties:
| Yield strength/Mpa | Tensile strength/Mpa | Unit elongation/% | Hardness HV | Bending |
| 294 | 516 | 30 | 137/138/138 | Qualified |
embodiment 2
Low chrome ferritic stainless steel composition C:0.013%, Si:0.32%, Mn:0.23%, P:0.021%, S:0.004%, Cr:12.1%, Ni:0.04%, N:0.013%, all the other are Fe and inevitable impurity.
Bell furnace holding temperature is 720 DEG C, soaking time 10 hours, and insulation terminates to be chilled to tapping temperature soon afterwards.
Hot rolled coil specification is 3.0mm, and finished product cold rolled strip is 1.0mm, and cold rolling total deformation rate is 66.67%, and each milling train deformation rate is respectively 1# milling train 28.2%, 2# milling train 23.8%, 3# milling train 20.7%, 4# milling train 17.5%, 5# milling train 13.9%, roll speed 95m/min.
The tandem rolling line operation of rolling is steady, and broken belt does not occur, and end properties meets inner quality standard.
End properties:
| Yield strength/Mpa | Tensile strength/Mpa | Unit elongation/% | Hardness HV | Bending |
| 281 | 501 | 28 | 139/140/141 | Qualified |
Cover annealing is passed through in embodiment 1 and embodiment 2, take low temperature long-time heat preservation, ensure the homogeneity of annealing process, obtain mechanical property stable after annealing, reduce the fluctuation of performance, mill milling total deformation rate and speed are set simultaneously, are distributed to the deformation rate of each mill milling, ensure the steadily excessive of milling train, realize the smooth rolling of stainless steel tandem rolling line.
Claims (2)
1. the method for a low chrome ferritic stainless steel continuous rolling, it is characterized in that: coil of strip composition is by weight percentage containing C≤0.030%, Si≤1.00%, Mn≤1.00%, P≤0.040%, S≤0.030%, Cr11 ~ 13.5%, Ni≤0.60%, N≤0.030%, all the other are Fe and inevitable impurity, coil of strip is by after batch annealing, the afterbody of last coil of strip and the stem of a rear coil of strip are passed through together with laser welder, after pickling, successively via five mill millings, five mill milling process total deformation rates are 60% ~ 80%, wherein the first mill milling process deformation rate is 25% ~ 30%, second mill milling process deformation rate is 21% ~ 26%, 3rd mill milling process deformation rate is 18% ~ 23%, 4th mill milling process deformation rate is 15% ~ 20%, 5th mill milling process deformation rate is 12% ~ 17%, roll speed is 80 ~ 110m/min.
2. the method for a kind of low chrome ferritic stainless steel continuous rolling according to claim 1, is characterized in that: annealing temperature is 680 DEG C ~ 780 DEG C, and soaking time is 10 hours, and after insulation terminates, the type of cooling is for be chilled to ambient temperature soon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510494899.1A CN105132819B (en) | 2015-08-13 | 2015-08-13 | A kind of method of low chrome ferritic stainless steel continuous rolling |
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| CN201510494899.1A CN105132819B (en) | 2015-08-13 | 2015-08-13 | A kind of method of low chrome ferritic stainless steel continuous rolling |
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| CN105132819A true CN105132819A (en) | 2015-12-09 |
| CN105132819B CN105132819B (en) | 2016-11-30 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106583449A (en) * | 2016-12-22 | 2017-04-26 | 山西太钢不锈钢股份有限公司 | Rolling method of ferritic stainless steel |
| CN107130188A (en) * | 2017-04-07 | 2017-09-05 | 邢台钢铁有限责任公司 | Welding ferritic stainless steel and its method for refining |
| CN107716558A (en) * | 2017-10-13 | 2018-02-23 | 山西太钢不锈钢股份有限公司 | It is a kind of to control the stable operating method by five frame connection rolling machine of stainless steel weld joint |
| CN108856289A (en) * | 2018-06-01 | 2018-11-23 | 山西太钢不锈钢股份有限公司 | Middle chrome ferritic stainless steel cold rolled strip steel production method |
| CN112029984A (en) * | 2020-08-13 | 2020-12-04 | 山东泰山钢铁集团有限公司 | Method for producing TSCr9LP stainless steel in continuous pickling line |
| CN115044826A (en) * | 2022-05-07 | 2022-09-13 | 广西柳州钢铁集团有限公司 | 410 ferritic stainless steel |
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| JPS59104202A (en) * | 1982-12-06 | 1984-06-16 | Nisshin Steel Co Ltd | Cold rolling method of ferritic stainless steel |
| EP0769333A1 (en) * | 1995-10-19 | 1997-04-23 | Usinor Sacilor | Method for continuously producing, in a line, rolled sheet metal strip of stainless steel with improved surface condition |
| CN1318438A (en) * | 2001-06-05 | 2001-10-24 | 宁波宝新不锈钢有限公司 | Cold rolling process of ferrite and martensitic stainless steel belt |
| CN103372567A (en) * | 2012-04-26 | 2013-10-30 | 宝山钢铁股份有限公司 | Method for producing ferritic stainless steel bands with roughened surfaces through cold continuous rolling |
| CN104014588A (en) * | 2013-02-28 | 2014-09-03 | 宝钢不锈钢有限公司 | Method for producing ferrite stainless steel cold-rolled strip steel |
| CN104471099A (en) * | 2012-06-28 | 2015-03-25 | Posco公司 | Low chrome and ferrite-based stainless steel having improved corrosion resistance and anti-ridging properties |
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2015
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS59104202A (en) * | 1982-12-06 | 1984-06-16 | Nisshin Steel Co Ltd | Cold rolling method of ferritic stainless steel |
| EP0769333A1 (en) * | 1995-10-19 | 1997-04-23 | Usinor Sacilor | Method for continuously producing, in a line, rolled sheet metal strip of stainless steel with improved surface condition |
| CN1318438A (en) * | 2001-06-05 | 2001-10-24 | 宁波宝新不锈钢有限公司 | Cold rolling process of ferrite and martensitic stainless steel belt |
| CN103372567A (en) * | 2012-04-26 | 2013-10-30 | 宝山钢铁股份有限公司 | Method for producing ferritic stainless steel bands with roughened surfaces through cold continuous rolling |
| CN104471099A (en) * | 2012-06-28 | 2015-03-25 | Posco公司 | Low chrome and ferrite-based stainless steel having improved corrosion resistance and anti-ridging properties |
| CN104014588A (en) * | 2013-02-28 | 2014-09-03 | 宝钢不锈钢有限公司 | Method for producing ferrite stainless steel cold-rolled strip steel |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106583449A (en) * | 2016-12-22 | 2017-04-26 | 山西太钢不锈钢股份有限公司 | Rolling method of ferritic stainless steel |
| CN107130188A (en) * | 2017-04-07 | 2017-09-05 | 邢台钢铁有限责任公司 | Welding ferritic stainless steel and its method for refining |
| CN107130188B (en) * | 2017-04-07 | 2019-02-19 | 邢台钢铁有限责任公司 | Welding ferritic stainless steel and its method for refining |
| CN107716558A (en) * | 2017-10-13 | 2018-02-23 | 山西太钢不锈钢股份有限公司 | It is a kind of to control the stable operating method by five frame connection rolling machine of stainless steel weld joint |
| CN108856289A (en) * | 2018-06-01 | 2018-11-23 | 山西太钢不锈钢股份有限公司 | Middle chrome ferritic stainless steel cold rolled strip steel production method |
| CN112029984A (en) * | 2020-08-13 | 2020-12-04 | 山东泰山钢铁集团有限公司 | Method for producing TSCr9LP stainless steel in continuous pickling line |
| CN115044826A (en) * | 2022-05-07 | 2022-09-13 | 广西柳州钢铁集团有限公司 | 410 ferritic stainless steel |
| CN115044826B (en) * | 2022-05-07 | 2023-09-15 | 广西柳州钢铁集团有限公司 | 410 ferrite stainless steel |
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| CN105132819B (en) | 2016-11-30 |
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