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Technique for producing deep-drawing cold-rolled plate based on CSP technique

A cold-rolled steel plate and production process technology, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve the problems of unsuitable production of high-grade cold-rolled plate, poor quality of plate, small compression ratio, etc., to improve production efficiency , Reduce production costs and save energy

Active Publication Date: 2008-03-19
MAANSHAN IRON AND STEEL COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has high production efficiency and energy saving, but because the thickness of the continuous casting slab is less than 80mm, the compression ratio is small, and the quality of the rolled plate is poor, it is not suitable for the production of high-grade cold-rolled plates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Steelmaking: The steelmaking furnace adopts a converter with a capacity of 120 tons, with a tapping capacity of 125 tons and a tapping temperature of 1655℃; the molten steel from the steelmaking furnace is refined in the ladle refining furnace, using heating, composition adjustment, Conventional methods such as calcium treatment control the weight percentage of molten steel after refining to: C: 0.0058, Si: 0.062, Mn: 0.14, P: 0.015, S: 0.0012, Als: 0.058, N: 0.0038%, Ti: 0.070 %, the molten steel temperature is 1610°C.

[0022] 2. Continuous casting: The molten steel has a superheat of 35°C, and a funnel-shaped mold is used. The mold is hydraulically vibrated, the casting speed is 3.5m / min, and the casting thickness is 70mm.

[0023] 3. Soaking: The casting billet enters the soaking furnace after being cooled in the secondary cooling section. The soaking furnace length is 268m, the casting billet entering the furnace temperature is 930°C, the exit temperature is 1130°C,...

Embodiment 2

[0029] 1. Steelmaking: The steelmaking furnace adopts a converter with a capacity of 120 tons, with a tapping capacity of 125 tons and a tapping temperature of 1655℃; the molten steel from the steelmaking furnace is refined in the ladle refining furnace, using heating, composition adjustment, Conventional methods such as calcium treatment control the weight percentage of molten steel after refining to: C: 0.0038, Si: 0.048, Mn: 0.099, P: 0.013, S: 0.0041, Als: 0.068, N: 0.0029, Ti: 0.065% , The temperature of molten steel is 1610℃.

[0030] 2. Continuous casting: The molten steel has a superheat of 35°C, and a funnel-shaped mold is used. The mold is hydraulically vibrated, the casting speed is 3.5m / min, and the casting thickness is 70mm.

[0031] 3. Soaking: The casting billet enters the soaking furnace after being cooled in the secondary cooling section. The soaking furnace length is 268m, the casting billet entering the furnace temperature is 930°C, the exit temperature is 1130°...

Embodiment 3

[0037]1. Steelmaking: The steelmaking furnace adopts a converter with a capacity of 120 tons, with a tapping capacity of 125 tons and a tapping temperature of 1655℃; the molten steel from the steelmaking furnace is refined in the ladle refining furnace, using heating, composition adjustment, Conventional methods such as calcium treatment control the weight percentage of molten steel after refining to: C 0.0021, Si 0.029, Mn 0.12, P 0.016, S 0.0027, Als: 0.035, N: 0.0030, Ti: 0.065%, and molten steel temperature 1700°C .

[0038] 2. Continuous casting: The molten steel has a superheat of 40°C, and a funnel-shaped mold is used. The mold is hydraulically vibrated, the casting speed is 3.5m / min, and the casting thickness is 70mm.

[0039] 3. Soaking: The casting billet enters the soaking furnace after being cooled in the secondary cooling section. The soaking furnace length is 268m, the casting billet entering temperature is 950°C, the exit temperature is 1150°C, and the casting bille...

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Abstract

The present invention discloses a CSP process-based manufacturing technique of a cup drawing stage cold-rolled steel sheet. The manufacturing technique comprises the working procedures of steel-making, continuous casting, heat soaking, hot continuous rolling, cooling, curling, pickling and cold rolling, annealing and flattening. The pickling and cold rolling working procedure is realized by that after decoiling, a hot rolled coil enters into a pickling tank with the pickling speed of 160-170 m / min, and then enters into a four-frame cold continuous rolling mill train. The present invention has the relative percent of reduction that STD1 is 30-37 percent, STD2 is 35-40 percent, STD3 is 30-35 percent and STD4 is 0.1-0.5 percent, and the curling is performed after the cold rolling. The annealing and the flattening working procedures are realized by that the cold rolled hard coil enters into a cover-type annealing furnace, the annealing temperature is 675-685 DEG C, the temperature holding time is 10-15 h, and the flattening elongation rate is 1.0-1.5 percent. Compared with the prior art, the performance of the cup drawing cold-rolled steel sheet produced with the present invention can achieve the European standard EN10130: 1999, at the same time, the production cost can be reduced, the energy is saved, and the consumption is reduced.

Description

Technical field: [0001] The present invention relates to the technical field of a method for producing a cold-rolled steel sheet of deep-drawing grade interstitial-free (IF) steel, in particular to a deep-drawing grade interstitial-free steel produced by a short-flow thin slab continuous casting and rolling (CSP) process Production method of cold rolled steel sheet. Background technique: [0002] At present, deep drawing (DDQ grade) steel plates mainly include two series: low-carbon (micro-carbon) aluminum killed (AK) steel series and ultra-low carbon interstitial-free atom (IF) steel series. The uniform and fine grains in the hot rolling of ultra-low carbon IF steel sheet, the coarse and sparse second phase particles during annealing, and the extremely low solid solution content of C and N interstitial atoms are all conducive to the <111> / / ND texture during the annealing process. Development, thereby improving the deep drawing performance of the annealed steel sheet. [00...

Claims

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Application Information

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IPC IPC(8): C21D8/04B21B1/46C23G1/08B21B37/00C21D1/26C21D9/52C22C38/14B22D11/16B21D5/00
Inventor 刘永刚吴文林沈昶徐光元刘学华胡学文王强袁群
Owner MAANSHAN IRON AND STEEL COMPANY
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