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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AI-Extracted 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 ...

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.

Application Domain

Roll mill control devicesFurnace types +2

Technology Topic

Holding timeDeep drawing +3

Examples

Experimental program(3)
Effect test(1)

Example Embodiment

[0020] Example 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, and the casting billet residence time is 30min.

[0024] 4. Hot continuous rolling: After the cast slab exits the soaking furnace, it is removed by the descaling machine to show that the oxide scale enters the 7-stand hot continuous rolling mill. The start rolling temperature is 1100℃, the final rolling temperature is 920℃, and the average rolling speed is about 800m /min, the hot-rolled thickness is 2.7-4mm, the relative reduction ratio is F1: 40%; F2-F3: 30%; F4-F5: 15%; F6-F7: 10%;

[0025] 5. Cooling and coiling: firstly, it is quickly cooled from the final rolling temperature to 720°C; naturally cooled for 4-8s, and then quickly cooled to 650°C for coiling.

[0026] 6. Pickling and cold rolling: After uncoiling, the hot-rolled coil enters the pickling tank, the pickling speed is 166m/min, and then enters the 4-stand tandem cold rolling mill, the relative reduction ratio is STD1: 30%; STD2: 35%; STD3 : 30%; STD4: 0.1%; curl after cold rolling;

[0027] 7. Annealing and smoothing: the rolled hard coils enter the bell-type annealing furnace, the annealing temperature is 675℃, the holding time is 10h, and the smoothing elongation is 1.0%.

Example Embodiment

[0028] Example 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°C, and the casting billet residence time is 30min.

[0032] 4. Hot continuous rolling: After the cast slab exits the soaking furnace, it is removed by the descaling machine, indicating that the oxide scale enters the 7-stand hot continuous rolling mill. The starting rolling temperature is 1100℃, the final rolling temperature is 920℃, and the average rolling speed is 820m/ min, the hot-rolled thickness is 2.7-4mm, the relative reduction ratio is F1: 44%; F2-F3: 35%; F4-F5: 20%; F6-F7: 15%:.

[0033] 5. Cooling and coiling: firstly, it is quickly cooled from the final rolling temperature to 740°C; naturally cooled for 4-8s, and then quickly cooled to 680°C for coiling.

[0034] 6. Pickling and cold rolling: After uncoiling, the hot-rolled coil enters the pickling tank, the pickling speed is 160m/min, and then enters the 4-stand tandem cold rolling mill, the relative reduction ratio is STD1: 32%; STD2: 37%; STD3 : 32%; STD4: 0.2%; coiling after cold rolling;

[0035] 7. Annealing and smoothing: the rolled hard coils enter the bell-type annealing furnace, the annealing temperature is 680℃, the holding time is 12h, and the smoothing elongation is 1.2%.

Example Embodiment

[0036] Example 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 billet residence time is 40min.

[0040] 4. Hot tandem rolling: After the cast slab exits the soaking furnace, it is removed by the descaling machine to show that the oxide scale enters the 7-stand hot tandem mill. The start rolling temperature is 1120℃, the final rolling temperature is 930℃, and the average rolling speed is 850m/ min, the hot-rolled thickness is 2.7-4m, the relative reduction ratio is F1: 50%; F2-F3: 37%; F4-F5: 25%; F6-F7: 18%;

[0041] 5. Cooling and coiling: firstly, it is quickly cooled from the final rolling temperature to 760°C; naturally cooled for 4-8s, and then quickly cooled to 730°C for coiling.

[0042] 6. Pickling and cold rolling: After uncoiling, the hot-rolled coil enters the pickling tank at a pickling speed of 170m/min, and then enters the 4-stand tandem cold rolling mill. The relative reduction ratio is STD1: 37%; STD2: 40%; STD3 : 35%; STD4: 0.5%; coiling after cold rolling;

[0043] 7. Annealing and smoothing: the rolled hard coils enter the bell-type annealing furnace, the annealing temperature is 685℃, the holding time is 15h, and the smoothing elongation is 1.5%.

[0044] Table 1:

[0045]

PUM

Property	Measurement	Unit
Thickness	70.0	mm

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Increase productivity
Energy saving

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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