Rolling part steel

Details Rolling part steel Rolling part steel

1993-12-09

1995-09-05

Yee, Deborah

Metal treatment

Stock

Ferrous

148906, 148333, 384492, C22C 3800

Patent

active

054475791

ABSTRACT:
A rolling part steel with which the strength of a rolling part of a cold-worked bearing is improved compared with that of a conventional turned part by controlling the length and number of sulfide inclusions in the steel to an optimal range, when a rolling part steel is prepared so that the maximum length of sulfide inclusions in the steel is 100 .mu.m or less and that a number of sulfide inclusions whose lengths exceed 40 .mu.m is 50 or less per unit area (160 mm.sup.2) , the roughness of its bore surface is improved to have a greater strength. As a result, for example, a thus formed raceway ring has a longer life against fatigue-induced cracks than a turned raceway ring.

REFERENCES:
patent: 4042381 (1977-08-01), Thomas et al.
patent: 4255188 (1981-03-01), Riekels
patent: 4279646 (1981-07-01), Kato et al.
patent: 4642219 (1987-02-01), Takata et al.
patent: 4806304 (1989-02-01), Kimura et al.
patent: 5030017 (1991-07-01), Murakami et al.

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