Aluminum coated steel sheet having excellent oxidation resistance and heat resistance

A technology of oxidation resistance and heat resistance, applied in hot-dip plating process, chemical instruments and methods, transportation and packaging, etc., can solve the problems of adjustment, difficult Cr concentration, etc., and achieve improved resistance characteristics, excellent adhesion, Effect of excellent high temperature strength and oxidation resistance

Active Publication Date: 2013-08-21
POHANG IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its limitation is that elements added to the plating tank can increase the surface viscosity of the plating tank, making it particularly difficult to adjust the concentration of Cr to a constant level, and the usual coating operation cannot be performed at high speed

Method used

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  • Aluminum coated steel sheet having excellent oxidation resistance and heat resistance
  • Aluminum coated steel sheet having excellent oxidation resistance and heat resistance
  • Aluminum coated steel sheet having excellent oxidation resistance and heat resistance

Examples

Experimental program
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Embodiment approach

[0041] Exemplary embodiments of the present invention will be described in detail below.

Embodiment

[0043] Steel sheets having the compositions shown in Table 1 were vacuum melted and heated in a heating furnace at 1150°C to 1250°C for 1 hour, followed by hot rolling. Hot rolling is completed at 890°C to 920°C. Coiling was performed at 700°C. Then, the hot-rolled steel sheet was pickled and cold-rolled at a cold rolling reduction of 75%, and then, the cold-rolled steel sheet was hot-dipped aluminized.

[0044] For hot-dip aluminizing, degreasing cold-rolled steel sheets are heat treated in a reducing atmosphere of nitrogen and hydrogen (30% hydrogen concentration) at a dew point of -40°C and the maximum reduction annealing heat treatment temperature is 820°C. After heat treatment, the steel plate is cooled to 680°C and soaked for a period of time, and then immersed in a coating tank kept at 680°C for coating.

[0045] The plating bath consisted of 8.5% by weight Si and the balance aluminum. Gas wiping is performed to ensure a coating thickness of 20 to 30 μm per side. Af...

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Abstract

Provided is an aluminum coated steel sheet having excellent oxidation and heat resistance. The aluminum coated steel sheet includes an aluminum coating layer and an alloy layer. The aluminum coating layer is formed on a surface of a steel sheet which includes 0.001 to 0.015 wt% of carbon (C), 0.05 to 0.3 wt% of silicon (Si), 0.1 to 0.6 wt% of manganese (Mn), 0.01 to 0.05 wt% niobium (Nb), 0.01 wt% or less of phosphorus (P), 0.01 wt% or less of sulfur (S), 0.1 wt% or less of soluble aluminum (Al), 0.05 to 0.5 wt% of copper (Cu), 0.05 to 0.5 wt% nickel (Ni), 0.001 to 0.01 wt% of nitrogen (N), and the balance of Fe and inevitable impurities. The alloy layer includes an intermetallic compound at an interface between the steel sheet and the aluminum coating layer.

Description

technical field [0001] The present invention relates to a heat-resistant coated steel sheet that can be widely used in vehicle exhaust systems, domestic stove pipes, panels of various household heating appliances such as oil pans, and structural steel, and more specifically, The present invention relates to an aluminum-coated steel sheet having excellent oxidation resistance and heat resistance. Background technique [0002] The aluminum-coated steel plate made by coating aluminum-silicon alloy on cold-rolled steel plate not only has the mechanical properties and other physical properties of cold-rolled steel plate itself, but also has the corrosion resistance, heat resistance and attractiveness of aluminum. and heat reflectivity, and are widely used in automobiles, electric equipment, building materials, and the like. [0003] In terms of methods satisfying formability, heat resistance, discoloration resistance, and oxidation resistance, there is a technique in which alloy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/12C22C38/00
CPCC22C38/001C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C23C2/02C23C2/12Y10T428/12972Y10T428/265Y10T428/12764Y10T428/12757B32B15/012C23C2/0222C23C2/024C23C2/0224
Inventor 裴大喆林泰勋秦荣述
Owner POHANG IRON & STEEL CO LTD
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