Steel products excellent in machinability and machined steel par

Details Steel products excellent in machinability and machined steel par Steel products excellent in machinability and machined steel par

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).

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