Hardened steel tube member, automobile axle beam using hardened steel tube member, and method for manufacturing hardened steel tube member

A manufacturing method and component technology, applied in the directions of axles, quenching agents, manufacturing tools, etc., can solve the problems of cost, zinc volatilization, high cost, etc., and achieve the effects of inhibiting decarburization, improving fatigue characteristics, and inhibiting the reduction of fatigue life.

Active Publication Date: 2015-04-08
NIPPON STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, this method is also heated in a furnace, so it must be heated for a long time, during which time the zinc volatilizes
Therefore, there is a problem that it is necessary to pay special attention to zinc including the volatilized part, and it costs a lot.

Method used

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  • Hardened steel tube member, automobile axle beam using hardened steel tube member, and method for manufacturing hardened steel tube member
  • Hardened steel tube member, automobile axle beam using hardened steel tube member, and method for manufacturing hardened steel tube member
  • Hardened steel tube member, automobile axle beam using hardened steel tube member, and method for manufacturing hardened steel tube member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0130] Examples are shown below.

[0131] As inventive examples 1 to 6 and comparative examples 1 to 3, GI steel sheets with a composition of 0.24%C-0.2%Si-1.2%Mn-0.02%Ti-10ppmB were welded by electric welding, followed by press working, electrical heating and spray cooling , thereby manufacturing the shaft beam, and measured the micro-Vickers hardness at a depth of 50 μm from the surface of the base metal, the micro-Vickers hardness at a depth of 200 μm from the surface of the base metal, and fatigue properties. In addition, in Inventive Examples 1 to 6 and Comparative Examples 1 and 2, the contact portions were integrated by alloying.

[0132] Table 1 shows various setting conditions and measurement results. A is the weight per unit area (g / m 2 ), T is the highest heating temperature (°C), t is the holding time (hours), B is the heat treatment parameter, X is the micro-Vickers hardness at a depth of 200 μm from the surface of the base metal, and Y is the depth of 50 μm fro...

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Abstract

The hardened steel tube member is formed from a GI zinc-coated steel tube. The cross-section, which is perpendicular to the longitudinal direction, at the center of the longitudinal direction of the GI zinc-coated steel tube is substantially a V-shape, the V-shape comprising a contacting section in which the inner surfaces of the GI zinc-coated steel tube contact each other. The contacting section is integrated by a Fe-Zn alloy phase. The micro Vickers hardness at a depth of 50 µm from the surface layer of the base metal is 95% or more of the micro Vickers hardness at a depth of 200 µm from the surface layer of the base metal.

Description

technical field [0001] The present invention relates to a quenched steel pipe member, an automobile axle beam using the quenched steel pipe member, and a method for manufacturing the quenched steel pipe member. This application claims priority based on Japanese Patent Application No. 2012-207249 for which it applied in Japan on September 20, 2012, and uses the content here. Background technique [0002] Axle beams for automobiles are members that connect the left and right axles, and loads are repeatedly applied during driving, so high fatigue characteristics are required. [0003] Therefore, as shown in Patent Document 1, there is proposed a method of manufacturing an automotive axle beam in which fatigue properties are ensured by press-forming a steel pipe followed by quenching to increase its strength. [0004] However, in this method, since quenching is performed in a furnace, the heating time is long, the outermost layer of the member is decarburized and softened, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/28C22C38/14C22C38/58C23C2/06C23C2/38
CPCC21D1/18C21D9/0068C23C2/28C22C38/02B32B15/013C23C2/06C22C38/14C21D9/08C22C38/04C23C2/38C21D1/34C21D1/60C22C38/00C23C2/29B60B35/02B60B2360/102
Inventor 福士孝聪佐藤浩一加藤敏滨谷秀树广田芳明
Owner NIPPON STEEL CORP
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