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Control method of coating performance surface quality of double-phase steel cold-rolled high-strength automobile board

A surface quality and control method technology, applied in the field of metallurgy, can solve the problems of unfavorable formation of continuous, uniform and dense phosphating film, reduced surface uniformity, high local activity, etc., achieve high-quality phosphating film quality, improve surface quality, The effect of improving quality

Active Publication Date: 2019-01-04
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

4) Surface defects
Due to the potential difference between the inclusions and precipitates on the surface of the strip and the surrounding matrix and the difference in wettability to the phosphating solution, the surface uniformity is reduced and the local activity is high, which is not conducive to the formation of continuous, uniform and dense phosphating. membrane

Method used

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  • Control method of coating performance surface quality of double-phase steel cold-rolled high-strength automobile board
  • Control method of coating performance surface quality of double-phase steel cold-rolled high-strength automobile board
  • Control method of coating performance surface quality of double-phase steel cold-rolled high-strength automobile board

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The method for controlling the coating performance and surface quality of the dual-phase steel cold-rolled high-strength automobile sheet of this embodiment includes smelting, continuous casting, hot rolling, descaling, pickling rolling, continuous annealing and flattening processes. The specific process steps are as follows:

[0024] (1) Smelting process: control the chemical composition and mass percentage of the continuous casting billet as follows: C: 0.06%, Mn: 2.0%, S: 0.008%, P: 0.025%, Si: 0.2%, Als: 0.015% , N: 0.005%, the balance is Fe and unavoidable impurities;

[0025] (2) Continuous casting process: the drawing speed is controlled to 1.3m / min, the slab exit temperature is 1120℃, the furnace dwell time is 300min, and the residual oxygen content of the flue gas in the furnace is 4%;

[0026] (3) Hot rolling process: finishing rolling inlet temperature is 1025°C, final rolling temperature is 890°C, coiling temperature is 590°C;

[0027] (4) Descaling process: a three...

Embodiment 2

[0033] The method for controlling the coating performance and surface quality of the dual-phase steel cold-rolled high-strength automobile sheet of this embodiment includes smelting, continuous casting, hot rolling, descaling, pickling rolling, continuous annealing and flattening processes. The specific process steps are as follows:

[0034] (1) Smelting process: control the chemical composition and mass percentage of continuous casting slab: C: 0.09%, Mn: 1.4%, S: 0.005%, P: 0.015%, Si: 0.6%, Als: 0.06% , N: 0.004%, the balance is Fe and inevitable impurities;

[0035] (2) Continuous casting process: the drawing speed is controlled at 1.4m / min, the slab exit temperature is 1230℃, the furnace dwell time is 120min, and the residual oxygen content of the flue gas in the furnace is 3%;

[0036] (3) Hot rolling process: finishing rolling inlet temperature is 1075°C, final rolling temperature is 850°C, coiling temperature is 660°C;

[0037] (4) Descaling process: A three-stage descaling pr...

Embodiment 3

[0043] The method for controlling the coating performance and surface quality of the dual-phase steel cold-rolled high-strength automobile sheet of this embodiment includes smelting, continuous casting, hot rolling, descaling, pickling rolling, continuous annealing and flattening processes. The specific process steps are as follows:

[0044] (1) Smelting process: control the chemical composition and mass percentage of the continuous casting slab: C: 0.08%, Mn: 1.8%, S: 0.004%, P: 0.010%, Si: 0.4%, Als: 0.04% , N: 0.003%, the balance is Fe and inevitable impurities;

[0045] (2) Continuous casting process: the drawing speed is controlled at 1.5m / min, the slab discharge temperature is 1160℃, the furnace dwell time is 150min, and the residual oxygen content of the flue gas in the furnace is 3%;

[0046] (3) Hot rolling process: finishing rolling entrance temperature is 1050℃, final rolling temperature is 870℃, coiling temperature is 630℃;

[0047] (4) Descaling process: A three-stage des...

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Abstract

The invention discloses a control method of coating performance surface quality of a double-phase steel cold-rolled high-strength automobile board, which comprises smelting, continuous casting, hot rolling, descaling, acid rolling, continuous annealing and leveling. The descaling process uses a three-stage descaling process, wherein the descaling position comprises descaling after a heating furnace, descaling before rough rolling and descaling before finish rolling, the descaling pressure at each descaling point is greater than or equal to 24MPa, the rough rolling is reciprocating rolling, therolling is carried out for 5 times, and high-pressure water descaling is carried out for every time. By adjusting and optimizing a whole process production process, including controlling the chemicalcomposition of a continuous casting blank, improving the heating and cooling system of the continuous casting, hot rolling, and cold rolling, controlling the hot rolling and descaling processes and cold rolling and acid rolling processes, controlling the roughness of a leveled steel strip, and the like, the surface quality of the double-phase steel cold-rolled automobile board is improved, the element enrichment on the surface of the steel board is inhibited, the quality of a phosphating film is improved, the coating performance of the double-phase steel cold-rolled high-strength automobile board and the anti-corrosion performance of the double-phase steel cold-rolled high-strength automobile board after being coated are improved.

Description

Technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for controlling the surface quality of dual-phase steel cold-rolled high-strength automobile plates with coating properties. Background technique [0002] Duplex steel refers to steel mainly composed of ferrite phase and martensite phase. It can be obtained from low carbon steel or low alloy steel through critical zone treatment or controlled rolling. It is an important branch of low alloy high strength steel. It has low yield strength, high initial work hardening rate, and high performance in work hardening and yield strength. The characteristics of strain rate sensitivity and good combination of strength and ductility are one of the first-choice materials for automotive lightweighting. Modern cold-rolled dual-phase steels are generally produced through continuous annealing production lines and continuous hot-dip galvanizing lines. These equipment have strong...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D1/26C21D8/02C21D9/52
CPCC21D1/26C21D8/0226C21D9/52C22C38/001C22C38/02C22C38/04C22C38/06
Inventor 齐建群杜雁冰孟凡月张静夏明生孟根巴根艾兵权张茜张赛娟
Owner TANGSHAN IRON & STEEL GROUP
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