Metal treatment – Stock – Ferrous
Patent
1998-06-24
1999-07-13
Yee, Deborah
Metal treatment
Stock
Ferrous
420 41, 420 42, C22C 3814
Patent
active
059221453
ABSTRACT:
The present invention is directed to steel products which exhibit excellent machinability and are suitable for steel stocks of structural steel parts for a variety of machinery, such as transportation machinery including automobiles, machinery for industrial use, construction machinery, and the like; as well as to a variety of machined structual steel parts for machinery such as crankshafts, connecting rods, gears, and the like. The steel products of the present invention are endowed with excellent machinability and have the following composition based on % by weight: C: 0.05% to 0.6%; S: 0.002% to 0.2%; Ti: 0.04% to 1.0%; N: 0.008% or less; Nd: 0% to 0.1%; Se: 0% to 0.5%; Te: 0% to 0.05%; Ca: 0% to 0.01%; Pb: 0% to 0.5%; and Bi: 0% to 0.4%; wherein the maximum diameter of titanium carbosulfide contained in the steel is not greater than 10 .mu.m, and its amount expressed in the index of cleanliness of the steel is equal to or more than 0.05%. The machined parts, according to the present inventions are manufactured by subjecting the steel products of the invention to a machining process, and are useful as structural steel parts for a variety of machinery, such as transportation machinery including automobiles, machinery for industrial use, construction machinery, and the like.
REFERENCES:
patent: 4662953 (1987-05-01), Giles, Jr.
patent: 5102619 (1992-04-01), Garrison, Jr. et al.
patent: 5236521 (1993-08-01), Shikanai et al.
Tetsu-To-Hagane (vol. 57 (1971) S484).
Okada Yasutaka
Watari Koji
Sumitomo Metal Industries Ltd.
Yee Deborah
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