Bearing steel and rolling bearing made thereof

Details Bearing steel and rolling bearing made thereof Bearing steel and rolling bearing made thereof

1990-10-09

1994-03-29

Robinson, Ellis P.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428329, 428404, 428457, 428472, 428469, 428614, 428632, 164477, 148328, 148906, 420 8, 420528, B32B 1800

Patent

active

052983234

ABSTRACT:
A long-life bearing steel and a long-life rolling bearing made of the steel are disclosed. In the steel, the number of oxide or oxide-based inclusion particles in a given unit area A of 160 mm.sup.3 with an average particle size of 3 to 30 .mu.m is 80 or less and an abundance of oxide or oxide-base inclusion particles with 10 .mu.m or more average particle size to oxide or oxide-based inclusion particles having an average particle size of 3 to 30 .mu.m is below 2%. An electron beam melting extraction evaluation method irradiating electron beam under the following condition guarantees the cleanness of the steel: 350 V+100.ltoreq.J.ltoreq.700 V+200, wherein J represents electric charge power in W provided by electron beam and V represents a sample volume in cm.sup.3.

REFERENCES:
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patent: 4904094 (1990-02-01), Furumura et al.
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patent: 5011304 (1991-04-01), Murakami et al.
patent: 5030017 (1991-07-01), Murakami et al.
"Iron and Steel" vol. 10, pp. 83-90 (1989), by: Yoshio Nuri and Kazusige Umezawa Development of Separation and Evaluation Technique of Non-Metallic Inclusions in Steel by Electron Beam Melting.
Journal Issued May 19, 1987 by Japan Society for the Promotion of Science pp. 5-1 to 5-14.
ASTM-E45 of the American National Standards Institute: "Standard Recommended Practice for Determining the Inclusion Content of Steel" (Aug. 1976).
J18-G0555, "Microscopic Testing Method for the Non-Metallic Inclusions in Steel", (1977).

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