Method for producing steel plate with extra deep drawing iron and zinc alloy plating layer

A steel plate production method and alloy coating technology, applied in metal material coating technology, coating, hot-dip coating technology, etc., can solve the problems of slow cooling speed, etc., and achieve the effect of improved pulverization resistance and compact structure

Inactive Publication Date: 2015-02-11
武钢集团有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above patents and documents related to the cooling rate all involve the technology of controlling the structure and mechanical properties of the substrate or the process quality (such as spangles) of the pure zinc coating of the hot-dip galvanized sheet (GI plate) by adjusting the cooling rate. The common feature is that the cooling rate is slow ( The cooling rate is <30°C / s), and the cooling only involves the adjustment of the strength of the steel base material, but does not involve the coating

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  • Method for producing steel plate with extra deep drawing iron and zinc alloy plating layer
  • Method for producing steel plate with extra deep drawing iron and zinc alloy plating layer
  • Method for producing steel plate with extra deep drawing iron and zinc alloy plating layer

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Embodiment 1

[0023] see figure 1 , the present invention has the steel plate production method of ultra-deep drawing iron-zinc alloy coating, comprises the steps:

[0024] 1) Desulfurization of molten iron, converter smelting and alloying treatment;

[0025] 2) Carry out continuous casting to the molten steel whose composition reaches the standard to prepare a slab;

[0026] 3) Rough rolling is carried out on the slab, the rough rolling temperature is controlled at 1060°C, the final rolling temperature is controlled at 890°C, and the curling temperature is controlled at 680°C;

[0027] 4) Cold rolling the hot-rolled plate to the required thickness specification;

[0028] 5) Carry out alloying continuous hot-dip galvanizing treatment on the cold-rolled sheet, in which the speed of the unit is controlled at 90m / min, the heating temperature is controlled at 830°C, the temperature of the fast cooling section is controlled at 500°C, and the gas is used in the upward section after galvanizing ...

Embodiment 2

[0035] This embodiment is basically the same as Embodiment 1, the difference is that:

[0036] 3) Rough rolling is carried out on the slab, the rough rolling temperature is controlled at 1068°C, the final rolling temperature is controlled at 897°C, and the curling temperature is controlled at 696°C;

[0037] 5) Carry out alloying and continuous hot-dip galvanizing treatment on the cold-rolled sheet, in which the speed of the unit is controlled at 93m / min, the heating temperature is controlled at 837°C, the temperature of the fast cooling section is controlled at 506°C, and the gas is used in the upward section after galvanizing out of the galvanizing pot. The mist is used to cool the galvanized sheet, and the cooling rate is controlled at 43°C / s. After alloying, the zinc-iron alloy coated steel sheet is cooled with the fog, and the cooling rate is controlled at 39°C / s;

[0038] 6) Carry out skinning and oiling treatment on the alloyed plate, wherein the skinning elongation is co...

Embodiment 3

[0042] This embodiment is basically the same as Embodiment 1, the difference is that:

[0043] 3) Rough rolling is carried out on the slab, the rough rolling temperature is controlled at 1084°C, the final rolling temperature is controlled at 904°C, and the curling temperature is controlled at 707°C;

[0044] 5) Carry out alloying continuous hot-dip galvanizing treatment on the cold-rolled sheet, in which the speed of the unit is controlled at 96m / min, the heating temperature is controlled at 841°C, the temperature of the fast cooling section is controlled at 509°C, and the upward section after galvanizing is out of the galvanizing pot uses gas The mist is used to cool the galvanized sheet, and the cooling rate is controlled at 52°C / s;

[0045] 6) Carry out skinning and oiling treatment on the alloyed plate, wherein the skinning elongation is controlled at 0.3%, and the amount of oiling on the upper and lower surfaces is 19g / m 2 .

[0046] After adopting the technical solutio...

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Abstract

The invention discloses a method for producing a steel plate with an extra deep drawing iron and zinc alloy plating layer. The method comprises the following steps of (1) desulfurizing, smelting in a converter furnace, and alloying; (2) continuously casting to prepare a slab; (3) setting the rough milling temperature of a casting blank as 1060-1100 DEG C, the final rolling temperature as 890-920 DEG C, and the coiling temperature as 680-730 DEG C; (4) performing cold rolling; (5) alloying a cold rolling sheet, performing continuous hot galvanizing treatment, setting the unit speed as 90-100 m / min, the heating temperature as 830-850 DEG C and the temperature of a quick cooling section as 500-520 DEG C, cooling a galvanized plate at an upward section after the galvanized plate is taken out of a zinc pot, setting the cooling speed as 40-60 DEG C / s, alloying, cooling the steel plate, and setting the cooling speed as 30-50 DEG C / s. The method has the advantages that the plating layer at the surface of the ultra deep drawing GA (galvanized alloy) plate has dense structure, and is free from obvious cracks and deficiencies, the crystal grain of iron and zinc alloy on the surface of the plating layer is fine and small, the size distribution is uniform, the chalking-resistant property of the alloying plating layer is excellent, and the method can be widely applied to the production field of automobile steel.

Description

technical field [0001] The invention relates to the technical field of steel production for automobiles, in particular to a production method for a steel plate with an ultra-deep drawing iron-zinc alloy coating. Background technique [0002] Zinc-iron alloy coated steel sheet (GA) has excellent corrosion resistance, paintability, weldability and anti-gravel performance, and is widely used in automobile panels. However, at present, the surface coating structure of the conventional ultra-deep drawing GA board (requiring an elongation rate of more than 46%) is loose and not dense, the surface structure of the coating layer is coarse, the grain size distribution is uneven, and there are obvious microcracks on the surface. It is prone to shedding and pulverization of the coating, which will adversely affect the surface quality of stamping parts and production molds. [0003] After a preliminary search, it was found abroad that Posco developed an aqueous solution containing 2.0% ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C23C2/06C23C2/40
Inventor 陈宇黄锋杜小峰张彦文刘祥东王立辉段小平孙方义
Owner 武钢集团有限公司
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