C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/14 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/28 (2006.01) C22C 38/38 (2006.01) C22C 38/50 (2006.01) C22C 38/58 (2006.01) C22C 38/60 (2006.01)
Patent
CA 2243123
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 µm, 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 invention, 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.
La présente invention concerne un acier d'excellente usinabilité renfermant, en poids, 0,05 à 0,6 % de C, 0,002 à 0,2 % de S, 0,04 à 1,0 % de Ti, au maximum 0,008 % de N, 0 à 0,1 % de Nd, 0 à 0,5 % de Se, 0 à 0,05 % de Te, 0 à 0,01 % de Ca, 0 à 0,5 % de Pb et 0 à 0,4 % de Bi. Le diamètre maximal du carbure de titane/sulfure de cet acier ne dépasse pas 10 mu m et sa teneur n'est pas inférieure à 0,05 % en termes de pureté. Cet acier constitue un matériau adéquat pour les composants structurels de diverses machines telles que les automobiles et autres machines de transport, machines industrielles, machines de construction et autres, comme, par exemple, les vilebrequins, les bielles, les engrenages et autres pièces qui font l'objet d'un usinage.
Okada Yasutaka
Watari Koji
Gowling Lafleur Henderson Llp
Sumitomo Metal Industries Ltd.
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