Iron-zinc plating layer steel plate with yield strength of 280 MPa grade and production method

A technology with a yield strength of 280mpa, which is applied in the field of iron-zinc coated steel sheets and production, can solve the problems of high investment, high maintenance costs, and complicated equipment, and achieve the effect of dense surface structure, not easy to pulverize and fall off, and firm bonding

Active Publication Date: 2016-12-07
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

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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  • Iron-zinc plating layer steel plate with yield strength of 280 MPa grade and production method
  • Iron-zinc plating layer steel plate with yield strength of 280 MPa grade and production method
  • Iron-zinc plating layer steel plate with yield strength of 280 MPa grade and production method

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Embodiment Construction

[0026] The present invention is described in detail below:

[0027] Table 1 is the value list of the chemical components of each embodiment of the present invention and comparative examples;

[0028] Table 2 is the value list of the main process parameters of each embodiment of the present invention and comparative examples;

[0029] Table 3 is a list of tensile properties and coating quality of each embodiment of the present invention and comparative examples.

[0030] Each embodiment of the present invention is all produced by the following process:

[0031] 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 0.074- 0.120%;

[0032] 2) After galvanizing, the steel plate is sent to the zinc-iron diffusion treatment heating furnace under heat pre...

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Abstract

The invention discloses an iron-zinc plating layer steel plate with yield strength of 280 MPa grade. The iron-zinc plating layer steel plate comprises the following chemical components in percentage by weight (wt%): 0.06-0.07% of C, 0.065-0.08% of Si, 0.41-0.5% of Mn, P not more than 0.02%, S not more than 0.015%, and 0.015-0.05% of Als. 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 fed to a zinc-iron dispersion heating furnace under insulation measures; and the high-temperature zinc-iron dispersion treatment and the low-temperature zinc-iron dispersion treatment are performed for the zinc-plated steel plate in sequence. The steel plate is naturally cooled to the room temperature for future use. Under the precondition of guaranteeing the use mechanics of the steel plate, the surface of an alloying plating layer is compact in structure and free of obvious micro crack defects, the zinc-iron grains on the surface of the plating layer are fine and uniform in size distribution, the plating layer and a steel substrate are firm in bonding, and the plating layer is not easy to generate the pulverization and falling phenomenon in punch molding.

Description

technical field [0001] The invention relates to a galvanized steel sheet and a production method thereof, in particular to an iron-zinc coated steel sheet with a yield strength of 280 MPa and a production method thereof, and is suitable for a steel sheet 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 Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C23C2/40C23C2/06C23C2/28
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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