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Production method for zinc electroplated baked hardened steel plate for automobile outer plate

A baking hardening and production method technology, which is applied in the direction of furnace type, furnace, heat treatment furnace, etc., can solve the problems of affecting the appearance of the car body, the difficulty of stable control of the surface quality, etc., and achieve the reduction of production costs, wide range of process parameters and stable performance Effect

Active Publication Date: 2016-09-28
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its surface quality is difficult to control stably. When the automobile factory uses it, the protruding zinc slag on the surface of the steel plate is easy to form nodules in the stamping die and affect the subsequent stamping; in the painting process, the defects on the steel plate surface are easy to be enlarged and affect the appearance of the car body.

Method used

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  • Production method for zinc electroplated baked hardened steel plate for automobile outer plate
  • Production method for zinc electroplated baked hardened steel plate for automobile outer plate
  • Production method for zinc electroplated baked hardened steel plate for automobile outer plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The selected hardened steel plate has the following components and mass percentages: C: 0.0016%, Si: 0.025%, Mn: 0.46%, P: 0.047%, S: 0.015%, Nb: 0.0006%, Als: 0.03%, N: 0.0025%, the balance is iron and unavoidable impurities.

[0044] This preparation method passes through successively:

[0045] 1) Smelting and casting into slabs;

[0046] 2) Heating the slab prepared in step 1) to 1220°C, and controlling the final rolling temperature to 910°C;

[0047] 3) Conventional water cooling to the coiling temperature and coiling, the coiling temperature is controlled at 680°C;

[0048] 4) Carry out cold rolling: control the total reduction ratio of cold rolling to 85%;

[0049] 5) Carry out continuous annealing: control the annealing soaking temperature to 800°C, and control the strip running speed to 180m / min. The purpose is to promote the initial nucleation and growth of γ-oriented textured grains, so as to obtain good deep drawing performance. Therefore, the temperature...

Embodiment 2

[0062] The selected hardened steel plate has the following components and mass percentages: C: 0.0035%, Si: 0.030%, Mn: 0.40%, P: 0.060%, S: 0.015%, Nb: 0.0012%, Als: 0.055%, N: 0.004%, the balance is iron and unavoidable impurities.

[0063] This preparation method passes through successively:

[0064] 1) Smelting and casting into slabs;

[0065] 2) Heating the slab prepared in step 1) to 1230°C, and controlling the final rolling temperature to 915°C;

[0066] 3) Conventional water cooling to the coiling temperature and coiling, the coiling temperature is controlled at 690°C;

[0067] 4) Carry out cold rolling: control the total reduction ratio of cold rolling to 80%;

[0068] 5) Carry out continuous annealing: control the annealing soaking temperature to 805°C, control the strip running speed to 190m / min, and rapidly cool to 405°C; then perform overaging treatment at a temperature of 385°C, and control the treatment time to 190s;

[0069] 6) Leveling: control the roughne...

Embodiment 3

[0076] The selected hardened steel plate has the following components and mass percentages: C: 0.0016%, Si: 0.025%, Mn: 0.7%, P: 0.053%, S: 0.010%, Nb: 0.0009%, Als: 0.045%, N: 0.0030%, the balance is iron and unavoidable impurities.

[0077] This preparation method passes through successively:

[0078] 1) Smelting and casting into slabs;

[0079] 2) Heating the slab prepared in step 1) to 1240°C, and controlling the final rolling temperature to 920°C;

[0080] 3) Conventional water cooling to the coiling temperature and coiling, the coiling temperature is controlled at 700°C;

[0081] 4) Carry out cold rolling: control the total reduction rate of cold rolling to 78%;

[0082] 5) Carry out continuous annealing: control the annealing soaking temperature to 810°C, control the running speed of the strip steel to 200m / min, and rapidly cool to 400°C; then perform overaging treatment at a temperature of 380°C, and control the treatment time to 200s;

[0083] 6) Leveling: control...

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Abstract

The invention discloses a production method for a zinc electroplated baked hardened steel plate for an automobile outer plate and belongs to the field of cold-rolled deep-drawn zinc electroplating automobile steel. The production method comprises the following preparation steps that (1) constituent selection of the zinc electroplated baked hardened steel plate is conducted; (2) a plate blank is obtained through smelting and casting; (3) hot rolling is conducted after conventional heating; (4) conventional water cooling is conducted to the coiling temperature, and coiling is conducted; (5) cold rolling is conducted; (6) continuous annealing is conducted; (7) flattening is conducted; (8) conventional alkali washing, brushing, electrolytic degreasing and rinsing are conducted; and (9) zinc electroplating is conducted through a gravity method. According to the production method, the steel plate prepared through a conventional production technique is good in forming performance and baking and hardening performance, natural aging is avoided even if the steel plate is placed at the room temperature for months, and the performance is stable.

Description

technical field [0001] The invention belongs to the production field of cold-rolled deep-drawing electro-galvanized steel for automobiles, and in particular relates to a production method of electro-galvanized bake-hardened steel sheets for automobile outer panels. Background technique [0002] Since the automobile manufacturing industry has very high requirements on the outer plate, the steel plate is required to have ultra-high stamping performance and excellent surface quality. At present, most domestic and foreign automobile manufacturers use hot-dip galvanized deep-drawing plates, that is, the steel plates after continuous annealing enter the zinc pot, and the excess zinc liquid on the surface is blown off by an air knife. Its surface quality is difficult to control stably. When the automobile factory uses it, the protruding zinc slag on the surface of the steel plate is likely to form nodules in the stamping die and affect subsequent stamping; [0003] Under the premi...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/06C21D8/02C21D9/52C21D1/26C25D3/22C25D7/06
CPCC21D1/26C21D8/0226C21D8/0236C21D8/0273C21D9/52C22C38/001C22C38/004C22C38/02C22C38/04C22C38/06C22C38/12C25D3/22C25D7/0614
Inventor 冯冠文蔡捷孙方义黄道兵田伟胡宽辉文柯陈莹莹江鹤群
Owner 武汉钢铁有限公司
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