Steel wire for heat-resistant spring, heat-resistant spring...

Details Steel wire for heat-resistant spring, heat-resistant spring... Steel wire for heat-resistant spring, heat-resistant spring...

2008-07-29

2008-07-29

Sheehan, John P. (Department: 1793)

Metal treatment

Stock

Ferrous

C148S580000

Reexamination Certificate

active

07404865

ABSTRACT:
A high-strength steel wire for heat-resistant springs has both excellent high-temperature tensile strength and excellent high-temperature sag resistance at a temperature as high as 350 to 500° C., particularly at 400° C. or so (these properties are needed for spring materials). The steel wire contains (a) 0.01 to 0.08 wt % C, 0.18 to 0.25 wt % N, 0.5 to 4.0 wt % Mn, 16 to 20 wt % Cr, and 8.0 to 10.5 wt % Ni, (b) at least one constituent selected from the group consisting of 0.1 to 3.0 wt % Mo, 0.1 to 2.0 wt % Nb, 0.1 to 2.0 wt % Ti and 0.3 to 2.0 wt % Si, and (c) mainly Fe and unavoidable impurities both of which constitute the remainder. The steel wire has (a) a tensile strength of at least 1,300 N/mm2and less than 2,000 N/mm2before being treated with low-temperature annealing, and (b) a maximum crystal-grain diameter of less than 12 μm in the γ phase (austenite) in a transverse cross section of the wire.

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Machine—English translation of Japanese patent 2000-239804, Sumitomo Electric Industry LTD, Sep. 5, 2000.
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http://en.wikipedia.org/wiki/Image:Normal—distribution—and—scales.gif.

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