Low carbon calcium-sulfur containing free-cutting steel

Details Low carbon calcium-sulfur containing free-cutting steel Low carbon calcium-sulfur containing free-cutting steel

1975-09-12

1976-08-10

Steiner, Arthur J.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75123AA, 74123A, 75123E, 75123F, 75123G, 75123N, C22C 3860

Patent

active

039739503

ABSTRACT:
Low carbon calcium-sulfur containing free-cutting steel exhibiting improved machinability is disclosed. The said steel consists essentially of 0.03 to 0.10% carbon, up to 0.3% silicon, 0.8 to 1.5% manganese, 0.04 to 0.10% phosphorus, 0.20 to 0.45% sulfur, 0.0003 to 0.0050% calcium and the remainder being iron and inherent impurities such as copper, nickel, chromium and nitrogen; and is prepared by regulating the composition of the steel so that the value of theoretical Brinell hardness of the steel matrix, which is determined on the basis of the content of carbon, silicon, manganese, phosphorus, sulfur, copper, nickel, chromium and nitrogen in the steel, to a value between 110 and 130, and by forming and maintaining in the range of from 100 to 500 grams per steel-ton oxide inclusions of type JIS-A2 (ASTM-C) which soften or fuse at a temperature not higher than 1400.degree.C.

REFERENCES:
patent: 2484231 (1949-10-01), Kent
patent: 3723103 (1973-03-01), Kato et al.
patent: 3844773 (1974-10-01), Yamakoshi et al.

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