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Method for producing secondary cold-rolling tinning original plate

A production method and secondary cold-rolling technology, applied in the field of iron and steel smelting materials, can solve the problems of poor deep-drawing performance of secondary cold-rolled tinplate and consume huge financial resources and manpower, and achieve good deep-drawing processing performance and economical use cost, cost reduction effect

Inactive Publication Date: 2011-06-22
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the deep drawing performance of the secondary cold-rolled tinplate produced by continuous annealing is not as good as that of the bell-type annealed secondary cold-rolled tinplate, and there are still a large number of user needs for the secondary cold-rolled tinplate produced by bell-type annealing
Moreover, investing in a new DCR unit production line dedicated to continuous annealing and secondary cold rolling will consume huge financial and manpower

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) After the molten iron is desulfurized, it is smelted by converter blowing and vacuum treatment, and then the weight percentage of the chemical composition of the steel is controlled after hot rolling: C: 0.05, Si: 0.007, Mn: 0.6, P: 0.016, S: 0.007, and the rest are Fe and unavoidable impurities.

[0026] 2) Wash the low-carbon steel with 10% dilute hydrochloric acid push-pull and clean water.

[0027] 3) Carry out the first cold rolling with the HC rolling mill, and the cumulative reduction rate is 85%.

[0028] 4) Bell-type annealing in full hydrogen furnace after electrolytic degreasing, the annealing temperature is 550-560°C, and the annealing time is 30h.

[0029] 5) Carry out the second cold rolling with the HC rolling mill, and the reduction ratio is 30%.

[0030] 6) The two machines are leveled, and the thickness is controlled to be 0.18mm after leveling.

[0031] The 0.18mm thick high-strength secondary cold-rolled tin-plated original plate produced by th...

Embodiment 2

[0033] 1) After the molten iron is desulfurized, it is smelted by converter blowing and vacuum treatment, and then the weight percentage of the chemical composition of the steel is controlled after hot rolling: C: 0.070, Si: 0.005, Mn: 0.47, P: 0.020, S: 0.05, and the rest are Fe and unavoidable impurities.

[0034] 2) Wash the low-carbon steel with 10% dilute hydrochloric acid push-pull and clean water.

[0035] 3) Carry out the first cold rolling with the HC rolling mill, and the cumulative reduction rate is 90%.

[0036] 4) Bell-type annealing in a full hydrogen furnace after electrolytic degreasing, the annealing temperature is 540-550°C, and the annealing time is 15h.

[0037] 5) Carry out the second cold rolling with the HC rolling mill, and the reduction rate is 35.8%.

[0038] 6) The two machines are leveled, and the thickness is controlled to be 0.15mm after leveling.

[0039] The 0.15mm thick high-strength secondary cold-rolled tin-plated original plate produced b...

Embodiment 3

[0041] 1) After the molten iron is desulfurized, it is smelted by converter blowing and vacuum treatment, and then the weight percentage of the chemical composition of the steel is controlled after hot rolling: C: 0.072, Si: 0.006, Mn: 0.49, P: 0.02, S: 0.005, and the rest are Fe and unavoidable impurities.

[0042] 2) Wash the low-carbon steel with 10% dilute hydrochloric acid push-pull and clean water.

[0043] 3) The first cold rolling was carried out with the HC rolling mill, and the cumulative reduction rate was 86.8%.

[0044] 4) After electrolytic degreasing, bell-type annealing in a full-hydrogen furnace, the annealing temperature is 530-540°C, and the annealing time is 20h.

[0045] 5) Carry out the second cold rolling with the HC rolling mill, and the reduction rate is 34.3%.

[0046] 6) The two machines are leveled, and the thickness is controlled to be 0.16mm after leveling.

[0047] The 0.16mm thick high-hardness secondary cold-rolled tin-plated original plate ...

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Abstract

The invention discloses a method for producing a secondary cold-rolling tinning original plate. The method comprises the following steps: after desulfurizing the molten iron, carrying out repeated blowing smelting and vacuum processing by a convertor and then controlling the weight percent of the chemical components of a steel product to meet the following proportion: 0.05-0.13% of C, at most 0.030% of Si, 0.60% of Mn, at most 0.020% of P, at most 0.050% of S and the balance of Fe and unavoidable impurities after hot rolling; washing the steel product by dilute acid, then carrying out cold rolling for the first time by an HC rolling machine, adding up the relative draught and controlling at 85-90%; then, annealing in a full hydrogen furnace enclosure type and controlling the annealing temperature between 510 DEG C and 560 DEG C; afterwards, carrying out cold rolling for the second time by the HC rolling machine, adding up the relative draught and controlling at 30-40%; and finally, obtaining the secondary cold-rolling tinning original plate by double-machine flattening. Experiments prove that the secondary cold-rolling tinning original plate produced by the method has the advantages of small thickness, high hardness, good corrosion-resisting properties and deep-punching processing performance and the like.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting materials, and in particular relates to a production method of a secondary cold-rolled tin-plated raw plate. Background technique [0002] At present, there are more than 40 secondary cold rolling production lines in the world using DCR (Double Cold Reduction) units dedicated to secondary cold rolling, mainly distributed in North America, East Asia and Europe. The 1220 double-stand secondary cold rolling and tempering unit adopted by domestic Baosteel cold rolling sheet plant is the first DCR unit in China. It was imported from Japan’s Mitsubishi Hitachi in 2003 and is currently the most advanced secondary cold rolling six-roller in the world. One of the UCM rolling mills, it has the functions of secondary cold rolling, wet skinning and dry skinning. [0003] Due to the difficulty in production of secondary cold-rolled tinplate by bell annealing (BA) and high quality control requirements, m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/60C22C38/02C22C38/04C21D1/26C21C1/02C21C5/28C21C7/10
Inventor 黄先球柳长福涂元强白会平任予昌刘海军童文赵柱魏远征郭玉华钟定忠黎静
Owner 武钢集团有限公司