Quenched steel pipe member, automobile axle beam using the quenched steel pipe member, and method for manufacturing the quenched steel pipe member

A manufacturing method and component technology, which can be applied to coatings, metal material coating processes, hot dip plating processes, etc., can solve problems such as large cost, cost, zinc volatilization, etc., so as to inhibit decarburization, improve fatigue characteristics, and inhibit fatigue. The effect of reducing the lifespan

Active Publication Date: 2016-11-30
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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  • Quenched steel pipe member, automobile axle beam using the quenched steel pipe member, and method for manufacturing the quenched steel pipe member
  • Quenched steel pipe member, automobile axle beam using the quenched steel pipe member, and method for manufacturing the quenched steel pipe member
  • Quenched steel pipe member, automobile axle beam using the quenched steel pipe member, and method for manufacturing the quenched steel pipe member

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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 quenched steel pipe member of the present invention is formed of a GI galvanized steel pipe whose cross-section perpendicular to the longitudinal direction in the central portion of the GI galvanized steel pipe has a contact between the inner peripheral surfaces of the GI galvanized steel pipe. The contact part is roughly V-shaped, and the contact part is integrated by the Fe-Zn alloy phase, and the micro-Vickers hardness at a depth of 50 μm from the surface of the base metal is 200 μm from the surface of the base metal. More than 95% of the micro Vickers hardness.

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 Patents(China)
IPC IPC(8): C23C2/28C22C38/14C22C38/58C23C2/06C23C2/38
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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