A kind of iron-zinc coated steel plate with a yield strength of 310mpa and its production method

A yield strength, zinc coating technology, applied in coating, hot dip plating process, metal material coating process, etc., can solve the problems of high investment, high maintenance cost, complex equipment, etc., achieve fine size distribution, dense surface, The effect of dense structure

Active Publication Date: 2018-08-07
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If a fully enclosed alloying furnace is used, the one-step heating method can be used, but the investment of this equipment is high, the equipment is complicated, and the cost of maintenance and accessories is also high

Method used

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  • A kind of iron-zinc coated steel plate with a yield strength of 310mpa and its production method
  • A kind of iron-zinc coated steel plate with a yield strength of 310mpa and its production method
  • A kind of iron-zinc coated steel plate with a yield strength of 310mpa and its production method

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Embodiment Construction

[0028] The present invention is described in detail below:

[0029] Table 1 is the value list of the chemical components of each embodiment of the present invention and comparative examples;

[0030] Table 2 is the value list of the main process parameters of each embodiment of the present invention and comparative examples;

[0031] Table 3 is a list of tensile properties and coating quality of each embodiment of the present invention and comparative examples.

[0032] Each embodiment of the present invention is all produced by following process:

[0033] 1) Carry out continuous hot-dip galvanizing on the cold-rolled steel plate, and control the temperature of the zinc pot at 455~465°C, and control the temperature of the strip steel into the zinc pot at 460~490°C; control the aluminum weight percentage content in the zinc solution at 0.071- 0.120%;

[0034] 2) After galvanizing, the steel plate is sent to the zinc-iron diffusion treatment heating furnace under heat preserv...

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Abstract

The invention discloses an iron-zinc plated layer steel plate with yield strength of 310 MPa grade. The iron-zinc plated layer steel plate comprises the following chemical components in percentage by weight (wt%): 0.07-0.08% of C, 0.075-0.09% of Si, 0.40-0.5% of Mn, P not more than 0.02%, S not more than 0.015%, 0.015-0.05% of Al, and 0.009-0.015% of Nb. A production method comprises the following production steps: the continuous hot zinc plating is performed for a cold-rolled steel plate; the steel plate is sent to a zinc-iron dispersion heating furnace under an insulation measure; the zinc-iron dispersion of low temperature after high temperature is performed for the zinc-plated steel plate; and the steel plate is naturally cooled to reach the room temperature for future use. Under the precondition of guaranteeing use mechanics of the steel plate, an alloyed plated layer surface is compact in structure, is free of obvious micro crack defects, is fine in zinc-iron grains, and is uniform in size distribution of the zinc-iron grains; and the plated layer is firm in combination with a steel substrate, and is not easy to generate the pulverization and fall phenomenon during punching.

Description

technical field [0001] The invention relates to a galvanized steel plate and a production method thereof, in particular to an iron-zinc coated steel plate with a yield strength of 310 MPa and a production method thereof, and is suitable for a steel plate with a thickness of 0.7-1.2mm. Background technique [0002] Zinc-iron coated steel sheet (GA) has excellent corrosion resistance, paintability, weldability and anti-gravel performance, and is widely used in automobile panels. However, zinc slag and zinc ash are prone to appear on the surface of the coating, and the iron content and phase structure of the coating cross-section are unevenly distributed. Defects such as shedding and pulverization of the coating are prone to occur during stamping and forming, which will affect the surface quality of stamping parts and production molds. Negative Effects. [0003] After patent search, a production method of non-powdering thick-gauge zinc-iron alloyed plate was found. The strip s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/12C23C2/06C23C2/40C23C2/28
CPCC22C38/02C22C38/04C22C38/06C22C38/12C23C2/06C23C2/28C23C2/40
Inventor 陈宇杜晓峰彭涛方芳胡宽辉潘利波李立军张彦文王立辉
Owner 武汉钢铁有限公司
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