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High-strength zinc-aluminum-magnesium-coated steel sheet with good surface quality and manufacturing method thereof

A technology for surface quality and coated steel sheets, which is applied in the manufacture of high-strength zinc-aluminum-magnesium coated steel sheets and the field of high-strength zinc-aluminum-magnesium coated steel sheets. Good toughness and high coating hardness

Active Publication Date: 2018-02-27
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The problem with the above-mentioned invention is that when the silicon and manganese content in the steel is high, the surface quality of the coating is poor, and surface defects such as missing plating and zinc slag are prone to occur.

Method used

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  • High-strength zinc-aluminum-magnesium-coated steel sheet with good surface quality and manufacturing method thereof
  • High-strength zinc-aluminum-magnesium-coated steel sheet with good surface quality and manufacturing method thereof
  • High-strength zinc-aluminum-magnesium-coated steel sheet with good surface quality and manufacturing method thereof

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Embodiment Construction

[0039] The invention discloses a high-strength zinc-aluminum-magnesium coated steel plate with good surface quality and a manufacturing method thereof. 0.008%, Cr 0.01%~0.60% and / or Mo 0.01%~0.30% can also be added, the chemical composition of the plating solution is Al 1%~12%, Mg1.0%~4.0%, Fe 0.002%~0.020%. The hot-rolling coiling temperature is 500-560°C, the surface roughness of the steel plate after cold-rolling is Ra 0.3-0.8μm, Rz≤3μm, the heating temperature is 620-680°C, and the oxygen partial pressure in the furnace is 2×10 -10 ~3×10 -6 Pa, the partial pressure of oxygen in the furnace during the subsequent heating and cooling process is 4×10 -38 ~5×10 -21 Pa, the temperature of the strip steel entering the zinc pot is 500-540°C, the temperature of the zinc-aluminum-magnesium alloy melt is 420-480°C, after plating, it is cooled at a cooling rate of 15-30°C / s, and the temperature of the strip steel is reduced to below 280°C before turning . When the strip steel ente...

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Abstract

The invention discloses a good-surface quality and high-strength zinc-aluminum-magnesium coating steel plate and a manufacturing method thereof. Steel comprises 0.09%-0.18% of C, 0.40%-1.60% of Si, 0.80%-2.10% of Mn and 0.001%-0.008% of S, and 0.01%-0.60% of Cr and / or 0.01%-0.30% of Mo can further be added. A coating comprises 1%-14% of Al, 1.0%-5.0% of Mg, and the balance zinc and inevitable impurities. The hot rolling coiling temperature is 500 DEG C-560 DEG C; the surface asperity Ra of the steel plate after cold rolling is 0.3-0.8 [mu]m, and Rz is smaller than or equal to 3 [mu]m; the heating temperature is 620 DEG C-680 DEG C; the oxygen partial pressure in a furnace is 2*10<-10>-3*10<-6> Pa; in the subsequent heating and cooling processes, the oxygen partial pressure in the furnace is 4*10<-38>-5*10<-21> Pa; the temperature of strip steel entering a zinc pot is 500 DEG C-540 DEG C; the zinc-aluminum-magnesium alloy melt temperature is 420 DEG C-480 DEG C; after coating, cooling is conducted at the cooling speed of 15-30 DEG C / s; and the temperature is lowered to 280 DEG C or below before the strip steel is veered.

Description

technical field [0001] The invention belongs to the field of metal coating, in particular to a method for manufacturing a high-strength zinc-aluminum-magnesium coated steel sheet with good surface quality and the high-strength zinc-aluminum-magnesium coated steel sheet. Background technique [0002] In the field of hot-dip galvanizing, in order to improve the corrosion resistance of galvanized steel sheets and the strength of steel sheets, 450-1000MPa galvanized steel sheets and alloyed galvanized steel sheets such as DP, TRIP, CP, and QP have been developed, but galvanized steel sheets are resistant to corrosion. The corrosion resistance is poor, the coating of alloyed galvanized steel sheet is easy to pulverize, and red rust is easy to appear after corrosion. [0003] JP2009228079 discloses 590MPa high-strength and low-yield-ratio zinc-aluminum-magnesium coated steel sheet. The chemical composition of the coating is Al: 3% to 22%, Mg: 1% to 10%, and the content of Ti<0....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/18C23C2/06C23C2/40C23C2/22
CPCC22C38/02C22C38/04C22C38/12C22C38/18C23C2/06C23C2/22C23C2/40
Inventor 李锋吕家舜杨洪刚周芳冯士杰
Owner ANGANG STEEL CO LTD
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