CN102337470A - Thin container plate and production method thereof - Google Patents
Thin container plate and production method thereof Download PDFInfo
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- CN102337470A CN102337470A CN2011102815906A CN201110281590A CN102337470A CN 102337470 A CN102337470 A CN 102337470A CN 2011102815906 A CN2011102815906 A CN 2011102815906A CN 201110281590 A CN201110281590 A CN 201110281590A CN 102337470 A CN102337470 A CN 102337470A
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Abstract
The invention relates to a thin container plate and a production method thereof. The thin container plate comprises the following chemical ingredients in percentage by weight: 0.07-0.11% of C, 0.40-0.55% of Si, 0.30-0.45% of Mn, 0.08-0.12% of P, less than or equal to 0.006% of S, 0.26-0.35% of Cu, 0.35-0.55% of Cr, less than or equal to 0.09% of N and the balance of Fe and inevitable impurities. With the production method for the thin container plate, low-cost thin container plates of which the thickness is at most 1.6mm can be stably produced on a large scale on a traditional hot strip rolling production line which is not provided with a coil box. The production method has the advantages of high rolling yield rate and low alloy cost which is lowered than the traditional container plate alloy cost by ** yuan/ton.
Description
Technical field
The present invention relates to a kind of container plate and working method thereof, relate in particular to a kind of thin specification container plate and working method thereof.
Background technology
Container plate is as a big product in the hot rolling commodity volume; The millions of approximately tons of annual requirement, its distinguishing feature is that specification is thin, intensity is high and weathering resistance is high, its thinnest gauge thickness commonly used is 1.6mm; Account for 16% of each specification demand percentage; And require tensile strength greater than 480MPa, and to compare with straight carbon steel Q235B, the 72h cycle is soaked into the relative erosion rate of corrosive less than 60%.Just because of the container plate specification is thin, intensity is high, the traditional hot tandem rolling that does not have Coil Box is produced line, the finish rolling time is long, and band steel afterbody temperature drop is big, and afterbody distortion tension is big, the finish rolling poor stability: there is resonance in upper reaches frame, and there is the whipping problem in last frame; Simultaneously; For guaranteeing the steel weather resistance, added a large amount of expensive Cu, Ni non-corrosive metal element, also significantly increase its cost of alloy; Under the general low state of price of steel product; Common specification container plate with the competition of non-weathering steel in obviously be in a disadvantageous position, but the price advantage of thin specification container plate is obvious, has good product benefit.Therefore,, carry out the technical study of thin set of specifications vanning board production technology, realize that its economy, production in enormous quantities stably have very important significance the traditional hot continuous rolling production line of no Coil Box.
One Chinese patent application CN1974034A discloses " a kind of improved container plate producing process "; This method adopts bar strip continuous casting and rolling flow path; Utilization adds in steel≤mode of 0.05%Ti, and production tensile strength reaches 490MPa, the thinnest container plate that reaches 1.4mm.But this method cost of alloy is higher, and is only applicable to the characteristics of bar strip continuous casting and rolling flow path.
Summer, Xiao Ming waited the article of delivering (" thin specification boxboard produces at 1422 hot continuous rollings and produces research on the line "; " China is metallurgical ", 2011,21 (2): 41～44.) reported the Technology of producing the thin specification boxboard of production on the line at the traditional hot tandem rolling; This product line has Coil Box; The band steel toe tail temperature difference is less, and rolling stability is better relatively, but its production technology is to no Coil Box production line and inapplicable; It is big to solve no Coil Box traditional hot tandem-mill strip-steel head and tail temperature difference, the problem that rolling stability is bad.
Summary of the invention
The present invention is directed to the above-mentioned deficiency that the thin specification boxboard of existing no Coil Box traditional hot continuous rolling production line production exists, a kind of thin specification container plate and working method thereof are provided.
The technical scheme that the present invention solves the problems of the technologies described above is following: a kind of chemical component weight per-cent of thin specification container plate is: C:0.07%～0.11%, Si:0.40%～0.55%, Mn:0.30%～0.45%; P:0.08%～0.12%; S :≤0.006%, Cu:0.26%～0.35%, Cr:0.35%～0.55%; Ni :≤0.09%, all the other are Fe and unavoidable impurities element.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the thickness of said container plate is less than or equal to 1.6mm.
The present invention also provides a kind of technical scheme that solves the problems of the technologies described above following: a kind of working method of thin specification container plate may further comprise the steps: smelt and be cast into slab by the composition of above-mentioned thin specification container plate; Slab is sent into process furnace heat, batch after being rolled again; Wherein, Said slab heats through one section of heating, two sections of heating and soaking zone in process furnace; The coefficient of excess air that said heating is one section is 1.10～1.35, and the coefficient of excess air that said heating is two sections is 1.05～1.15, and the coefficient of excess air of said soaking zone is 0.95～1.03.
Further, the residual oxygen level of said soaking zone is less than 1%.
Further, the heating one section outlet temperature of said process furnace is 850 ℃～1180 ℃, and heating second stage exit temperature is 1225 ℃～1295 ℃, and tapping temperature is 1280 ℃～1320 ℃, and soaking time is greater than 30min, and total time inside furnace is greater than 180min.
Further, said rolling roughing temperature out is 1120 ℃～1150 ℃, and the finish rolling temperature out is 910 ℃～940 ℃.
Further, said temperature of batching is 510 ℃～540 ℃.
The invention has the beneficial effects as follows: adopt the working method of the thin specification container plate of the present invention to produce stable mass production 1.6mm and the thin specification container plate of following low cost on the line at the traditional hot tandem rolling that does not have Coil Box; Rolling lumber recovery height and cost of alloy are low, reduce by 80～150 yuan/ton than existing container plate cost of alloy; Stable mechanical property, ys are 375MPa～465MPa, and tensile strength is 510MPa～575MPa, and unit elongation is 29.5%～45.0%; Weather resistance is good, compares with Q235B, and its relative erosion rate is in 50%～55% scope.
Embodiment
Below principle of the present invention and characteristic are described, institute gives an actual example and only is used to explain the present invention, is not to be used to limit scope of the present invention.
1) the present invention adopts low Ni content composition design; To reduce cost of alloy: chemical ingredients is the main factor of decision steel atmospheric corrosion resistance; Through discovering, what the weathering resistance index was had the greatest impact is P and Cu element, secondly is Cr, Ni and Si element.The every increase by 0.03% of Cu, P, Cr, Ni and Si constituent content, the weathering resistance index increases by 0.165,0.488,0.036,0.033 and 0.030 respectively.Than the high one magnitude of Cr, Ni and Si element, Cr, Ni and Si are basic identical to the influence of weathering resistance exponential to the contribution of weathering resistance exponential for P and Cu element.In P, Cu, Cr, Ni and Si five big elements, the Ni element is the most expensive.Reduce Ni content in the first-selected reduction of the container plate cost of alloy steel, the present invention is controlled at Ni content below 0.09%.For remedying intensity, weathering resistance and the surface quality loss of falling behind the Ni, suitably improve P and Si constituent content in the steel, be controlled at 0.08%～0.12% and 0.40%～0.55% respectively; Simultaneously Cu is controlled at 0.26%～0.35%, Cr is controlled at 0.35%～0.55%.Compare with low silicon, low phosphoretic steel, 0.08%～0.12%P and 0.40%～0.55%Si can significantly suppress the generation of copper brittleness defective.For guaranteeing steel strength, C is controlled at 0.07%～0.11%, Mn is controlled at 0.30%～0.45%; For improving the steel forming property, S content is controlled at below 0.006%.
2) the present invention adopts the heating of high temperature weak oxide property atmosphere; To guarantee to fall surface quality of steel behind the Ni: after avoiding falling Ni, produce the copper brittleness defective; Process furnace adopts the heating of segmentation weak oxide property atmosphere; Be controlled to be 1.10～1.35,1.05～1.15 and 0.95～1.03 respectively at one section of process furnace heating, two sections of heating and soaking zone coefficient of excess air, the residual oxygen level of soaking zone is less than 1%; Process furnace adopts the high temperature tapping simultaneously, and the steel billet tapping temperature is controlled at 1280 ℃～1320 ℃.
3) the present invention adopts the high temperature controlled rolling, to guarantee finish rolling stage rolling stability: adopting on the high temperature tapping basis, for guaranteeing the finish rolling process stability; The roughing temperature out is controlled at 1120 ℃～1150 ℃, and the finish rolling finishing temperature is controlled at 910 ℃～940 ℃, to improve roll speed; Reduce rolling time; Elevator belt steel afterbody finish rolling temperature in increases the afterbody rolling stability, reduces afterbody resonance and whipping probability.
4) the present invention adopts low temperature to batch, to guarantee the finished product mechanical property: after adopting the high temperature controlled rolling, through the controlled rolling grain refinement effect a little less than, need to adopt low temperature to batch, it is cold to strengthen control, to improve the finished product mechanical property, coiling temperature is controlled at 510 ℃～540 ℃.
The present invention is that example describes with the 1580 hot continuous rollings product line of no Coil Box, and hot-rolled process comprises process furnace, roughing, finish rolling and batches.
Embodiment 1
(the chemical component weight per-cent of molten steel is: C:0.07%, Si:0.40%, Mn:0.45% with smelting good molten steel; P:0.08%, S:0.004%, Cu:0.27%; Cr:0.45%, Ni:0.07%, surplus is Fe and unavoidable impurities element); Be cast into slab, slab sent into process furnace heat; Be controlled to be 1.35 respectively at one section of process furnace heating, two sections of heating and soaking zone coefficient of excess air; 1.15 with 1.03, the residual oxygen level of soaking zone is 0.7, heating one section outlet temperature is 1135 ℃; Heating second stage exit temperature is 1259 ℃; 1290 ℃ of tapping temperatures, soaking time 52min, slab time inside furnace 220min; 1120 ℃ of roughing temperature outs, 910 ℃ of finish rolling temperature outs, 530 ℃ of coiling temperatures, rolling into thickness at last is the container plate of the thin specification of 1.6mm.Steel plate ys 440MPa, tensile strength 525MPa, unit elongation 36%, the d=a clod wash is qualified.Compare with Q235B, the 72h cycle is soaked into relative erosion rate 50%.
Embodiment 2
(the chemical component weight per-cent of molten steel is: C:0.08%, Si:0.45%, Mn:0.40% with smelting good molten steel; P:0.09%, S:0.003%, Cu:0.29%; Cr:0.40%, Ni:0.03%, surplus is Fe and unavoidable impurities element); Be cast into slab, slab sent into process furnace heat; Be controlled to be 1.20 respectively at one section of process furnace heating, two sections of heating and soaking zone coefficient of excess air; 1.10 with 1.00, the residual oxygen level of soaking zone is 0.5, heating one section outlet temperature is 966 ℃; Heating second stage exit temperature is 1257 ℃; 1300 ℃ of tapping temperatures, soaking time 65min, slab time inside furnace 243min; 1140 ℃ of roughing temperature outs, 930 ℃ of finish rolling temperature outs, 510 ℃ of coiling temperatures, rolling into thickness at last is the container plate of the thin specification of 1.5mm.Steel plate ys 450MPa, tensile strength 540MPa, unit elongation 33%, the d=a clod wash is qualified.Compare with Q235B, the 72h cycle is soaked into relative erosion rate 55%.
Embodiment 3
(the chemical component weight per-cent of molten steel is: C:0.10%, Si:0.50%, Mn:0.45%, P:0.11% with smelting good molten steel; S:0.002%, Cu:0.31%, Cr:0.50%; Surplus is Fe and unavoidable impurities element), be cast into slab, slab is sent into process furnace heat; Be controlled to be 1.10 respectively at one section of process furnace heating, two sections of heating and soaking zone coefficient of excess air; 1.05 with 0.95, the residual oxygen level of soaking zone is 0.3, heating one section outlet temperature is 1093 ℃; Heating second stage exit temperature is 1276 ℃; 1310 ℃ of tapping temperatures, soaking time 43min, slab time inside furnace 286min; 1150 ℃ of roughing temperature outs, 920 ℃ of finish rolling temperature outs, 520 ℃ of coiling temperatures, rolling into thickness at last is the container plate of the thin specification of 1.6mm.Steel plate ys 430MPa, tensile strength 525MPa, unit elongation 34%, the d=a clod wash is qualified.Compare with Q235B, the 72h cycle is soaked into relative erosion rate 53%.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a thin specification container plate is characterized in that, its chemical component weight per-cent is: C:0.07%～0.11%; Si:0.40%～0.55%, Mn:0.30%～0.45%, P:0.08%～0.12%; S :≤0.006%, Cu:0.26%～0.35%, Cr:0.35%～0.55%; Ni :≤0.09%, all the other are Fe and unavoidable impurities element.
2. thin specification container plate according to claim 1 is characterized in that the thickness of said container plate is less than or equal to 1.6mm.
3. the working method of a thin specification container plate is characterized in that, may further comprise the steps: smelt and be cast into slab by the composition of the described thin specification container plate of claim 1, slab is sent into process furnace heat, batch after being rolled again; Wherein, Said slab heats through one section of heating, two sections of heating and soaking zone in process furnace; The coefficient of excess air that said heating is one section is 1.10～1.35, and the coefficient of excess air that said heating is two sections is 1.05～1.15, and the coefficient of excess air of said soaking zone is 0.95～1.03.
4. the working method of thin specification container plate according to claim 3 is characterized in that, the residual oxygen level of said soaking zone is less than 1%.
5. the working method of thin specification container plate according to claim 3; It is characterized in that; The heating one section outlet temperature of said process furnace is 850 ℃～1180 ℃, and heating second stage exit temperature is 1225 ℃～1295 ℃, and tapping temperature is 1280 ℃～1320 ℃; Soaking time is greater than 30min, and total time inside furnace is greater than 180min.
6. the working method of thin specification container plate according to claim 3 is characterized in that, said rolling roughing temperature out is 1120 ℃～1150 ℃, and the finish rolling temperature out is 910 ℃～940 ℃.
7. the working method of thin specification container plate according to claim 3 is characterized in that, said temperature of batching is 510 ℃～540 ℃.
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| CN201110281590.6A CN102337470B (en) | 2011-09-21 | 2011-09-21 | Thin container plate and production method thereof |
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| CN201110281590.6A CN102337470B (en) | 2011-09-21 | 2011-09-21 | Thin container plate and production method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644031A (en) * | 2012-05-17 | 2012-08-22 | 武汉钢铁(集团)公司 | Hot rolling container steel without punctiform surface defect and manufacturing method thereof |
| CN102758145A (en) * | 2012-08-01 | 2012-10-31 | 南京钢铁股份有限公司 | Thick plate used for highly weather resistant structure with low compression ratio and production method thereof |
| CN104593695A (en) * | 2015-01-21 | 2015-05-06 | 首钢总公司 | Hot-rolled heavy gauge weathering resistant steel high in strength and low in nickel to copper ratio and production method of steel |
| CN104694713A (en) * | 2015-04-08 | 2015-06-10 | 首钢京唐钢铁联合有限责任公司 | Heating method for copper-bearing low-alloy steel |
| CN107597843A (en) * | 2017-07-31 | 2018-01-19 | 山西太钢不锈钢股份有限公司 | The method for rolling stainless steel hot plate |
| CN111101070A (en) * | 2020-02-17 | 2020-05-05 | 本钢板材股份有限公司 | Steel for low-temperature liquid container tank car and preparation method thereof |
| CN111719081A (en) * | 2019-03-21 | 2020-09-29 | 本钢板材股份有限公司 | Control method for reducing cost of steel optimized alloy for container |
| CN115110006A (en) * | 2022-07-28 | 2022-09-27 | 日照钢铁控股集团有限公司 | Weather-resistant steel with high corrosion resistance and preparation method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644031A (en) * | 2012-05-17 | 2012-08-22 | 武汉钢铁(集团)公司 | Hot rolling container steel without punctiform surface defect and manufacturing method thereof |
| CN102758145A (en) * | 2012-08-01 | 2012-10-31 | 南京钢铁股份有限公司 | Thick plate used for highly weather resistant structure with low compression ratio and production method thereof |
| CN104593695A (en) * | 2015-01-21 | 2015-05-06 | 首钢总公司 | Hot-rolled heavy gauge weathering resistant steel high in strength and low in nickel to copper ratio and production method of steel |
| CN104593695B (en) * | 2015-01-21 | 2017-03-01 | 首钢总公司 | The high-strength low nickel-copper ratio think gauge weathering steel of hot rolling and its production method |
| CN104694713A (en) * | 2015-04-08 | 2015-06-10 | 首钢京唐钢铁联合有限责任公司 | Heating method for copper-bearing low-alloy steel |
| CN104694713B (en) * | 2015-04-08 | 2017-03-01 | 首钢京唐钢铁联合有限责任公司 | A kind of heating means of cupric low-alloy steel |
| CN107597843A (en) * | 2017-07-31 | 2018-01-19 | 山西太钢不锈钢股份有限公司 | The method for rolling stainless steel hot plate |
| CN111719081A (en) * | 2019-03-21 | 2020-09-29 | 本钢板材股份有限公司 | Control method for reducing cost of steel optimized alloy for container |
| CN111101070A (en) * | 2020-02-17 | 2020-05-05 | 本钢板材股份有限公司 | Steel for low-temperature liquid container tank car and preparation method thereof |
| CN115110006A (en) * | 2022-07-28 | 2022-09-27 | 日照钢铁控股集团有限公司 | Weather-resistant steel with high corrosion resistance and preparation method thereof |
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| CN102337470B (en) | 2014-04-30 |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |
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