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Method for producing iron-zinc alloy coated steel plate with yield strength being equal to or higher than 220 MPa

A technology of alloy coating and yield strength, which is applied in metal material coating process, coating, hot-dip coating process, etc., can solve the problem of limited improvement in the compactness of the coating structure, and achieve fully refined grains, uniform size distribution, fine grain effect

Active Publication Date: 2016-01-27
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This document is to study the influence of the cooling rate on the surface roughness of the steel plate after galvanizing. The maximum cooling rate is only 10K / s, which has limited improvement on the compactness of the coating structure.

Method used

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  • Method for producing iron-zinc alloy coated steel plate with yield strength being equal to or higher than 220 MPa
  • Method for producing iron-zinc alloy coated steel plate with yield strength being equal to or higher than 220 MPa
  • Method for producing iron-zinc alloy coated steel plate with yield strength being equal to or higher than 220 MPa

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Embodiment Construction

[0020] The present invention is described in detail below:

[0021] Table 1 is the main process parameter list of each embodiment of the present invention and comparative example;

[0022] Table 2 is a list of performance test results of each embodiment of the present invention and comparative examples.

[0023] Each embodiment of the present invention all produces according to the following steps:

[0024] 1) Desulfurization of molten iron, smelting in a converter and continuous casting into billets;

[0025] 2) Carry out hot rolling, and control the rolling temperature of rough rolling at 1020-1060°C, and control the finishing rolling temperature at 860-890°C; 3) Conduct coiling, and control the coiling temperature at 650-700°C;

[0026] 4) Carry out cold rolling and roll to the required thickness;

[0027] 5) Carry out continuous hot-dip galvanizing, and control the speed of the unit at 100-130m / min, and the temperature of the zinc liquid at 457-463°C;

[0028] 6) Rapid...

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Abstract

The invention discloses a method for producing an iron-zinc alloy coated steel plate with the yield strength being equal to or higher than 220 MPa. The method comprises the steps that molten iron desulphurization, smelting through a converter and continuous casting are conducted, so that a billet is formed; hot rolling is conducted; rolling is conducted; cold rolling is conducted till the billet reaches the required thickness; continuous hot galvanizing is conducted; rapid cooling is conducted; aerial fog is used for cooling after zinc and iron are alloyed; finishing is conducted; oiling treatment is conducted; and sampling, performance testing and subsequence procedure treatment are conducted. According to the method for producing the iron-zinc alloy coated steel plate with the yield strength being equal to or higher than 220 MPa, on the premise that the yield strength ranges from 220 MPa to 260 MPa, the tensile strength ranges from 300 MPa to 380 MPa, and the elongation is equal to or higher than 43%, grains on the surface of a zinc-iron alloy coating are fine and are even in size distribution, the area ratio of holes in the surface of the coating is equal to or smaller than 5%, no microcrack exists on the surface, and the phenomena of pulverization and falling of the coating are unlikely to occur during stamping forming, namely the 90-degree V bending test grade reaches the level 2.

Description

technical field [0001] The invention relates to a production method of galvanized steel sheet, in particular to a production method of iron-zinc alloy coated steel sheet with yield strength ≥ 220MPa. Background technique [0002] Zinc-iron alloy coated steel sheet is widely used in automobile panels due to its excellent corrosion resistance, paintability, weldability and resistance to gravel impact. However, due to the poor compactness of the current zinc-iron alloy surface coating structure, coarse coating surface structure, uneven grain size distribution and obvious micro-cracks on the surface, the coating is prone to peeling off and pulverization during stamping forming, resulting in The surface quality of stamping parts does not meet the requirements and cannot meet the needs of users. [0003] After a preliminary search: "A high-strength alloyed hot-dip galvanized steel sheet with excellent pulverization resistance" published in the public report adopts the following c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C23C2/40C23C2/06
Inventor 许竹桃陈宇周元贵欧阳珉路
Owner 武汉钢铁有限公司
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