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Method for producing cold rolling domestic appliance plate using cover type oven

A bell-type furnace and home appliance technology, which is applied in the field of annealing process of cold-rolled plate bell-type furnaces, can solve problems that have not yet been seen, and achieve the effect of improving economic benefits.

Inactive Publication Date: 2007-08-01
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no relevant information and reports on this aspect have been seen so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The mass percentage of chemical composition of cold-rolled coil is: C0.08, Si0.024, Mn0.50, P0.017, S0.005, Als0.05, N0.004, Nb0.03, and the rest is Fe and trace impurities.

[0020] The bell furnace annealing process system adopted is:

[0021] Install the furnace according to the conventional method of bell-type furnace, and gradually raise the temperature to 200°C after installation

[0022] It takes 1.5 hours to raise the temperature from 200°C to 400°C; then use 5 hours to raise the temperature to 600°C at a constant speed; after 5 hours, the temperature slowly rises to 710°C; then keep the temperature at 710°C for 6 hours; 670°C; keep warm for 4 hours and then cool down; when the temperature drops to 400°C, spray water on the annealed coil; finally, when the temperature drops to 50°C, it is out of the furnace.

Embodiment 2

[0024] The mass percentage content of the chemical composition of the coil is: C0.10, Si0.03, Mn0.26, P0.02, S0.010, Als0.036, N0.0018, Nb0.016, and the rest is Fe and trace impurities.

[0025] The selected annealing process system is:

[0026] Rapidly raise the temperature to 400°C in 2 hours; raise the temperature to 600°C at a uniform speed for 4 hours; slowly raise the temperature to 710°C after 4 hours; keep at 710°C for 8 hours; then slowly cool down to 670°C for 5 hours; then cool down to 350°C When the temperature drops to 70°C, the annealed sheet will be rolled out of the furnace.

[0027] By implementing the above composition and annealing system, a cold-rolled home appliance panel with a yield ratio of 0.80 and an elongation rate of 30% can be obtained, which can fully meet the requirements of users for high yield ratio and higher elongation rate.

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Abstract

The invention relates to a method for preparing cold rolled household electrical appliance sheet with bell-type furnace, which in detail relates to a household electrical appliance sheet with high yield ration and high percentage of elongation mainly by controlling steel chemical component and adjusting bell- type funance annealing process. The comprised chemical component and weight percentage are follows: C 0.03-0.15, Si<=0.034, Mn0.17-0.65, P<=0.025, S<=0.02, Als0.02-0.055, N<=0.006 and Nb<=0.03. The annealing process comprises: temperature 200- 400 Deg. C, time 1- 2 hours; 400- 600 Deg. C, 4- 5 hours; 600- 710 Deg. C, 4- 6 hours; thermal insulating at 710 Deg. C; 710- 670 Deg. C, 3- 4hours; thermal insulating at 670 Deg. C for 3- 5 hours; water injecting at 400- 300 Deg. C; tapping temperature is 100- 50 Deg. C. The performance of prepared cold rolled household electrical appliance sheet reaches: yield strength 304 Mpa; strength for extension 379 Mpa, elongation 30%, rigidity HRB 63, and increased income of over100 yuan / t.

Description

technical field [0001] The invention belongs to a bell-type furnace annealing process for cold-rolled plates, in particular to a method for producing cold-rolled home appliance plates by using the bell-type furnace annealing process. Background technique [0002] At present, my country has become the world's major manufacturer of household appliances. Among them, the output of major home appliances that use more steel, such as refrigerators, washing machines, and air conditioners, has entered the forefront of the world. However, due to the relatively backward production technology of cold-rolled sheets in my country, the quality of cold-rolled sheets is poor and the output is small, so it is difficult to meet the growing demand for cold-rolled sheets, especially home appliance sheets. Therefore, for a long time, home appliance panels, especially high-end home appliance panels, have mostly relied on imports. Although it has improved in recent years, it has not been fundamen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21D1/26C21D9/46
Inventor 高毅王越蔡恒君崔恒朱新宇陈建光
Owner ANGANG STEEL CO LTD
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