Low carbon resulfurized free-machining steel having high...

Details Low carbon resulfurized free-machining steel having high... Low carbon resulfurized free-machining steel having high...

C - Chemistry, Metallurgy

22

C

C22C 38/00 (2006.01) C22C 38/60 (2006.01) C21C 7/00 (2006.01) C21C 7/04 (2006.01) C21C 7/06 (2006.01)

Patent

CA 2620388

A low carbon resulfurized free-machining steel having a high machinability is provided. This steel comprises 0.02 to 0.15% by mass of C, up to 0.004% by mass (more than 0% by mass) of Si, 0.6 to 3% by mass of Mn, 0.02 to 0.2% by mass of P, 0.2 to 1% by mass of S, up to 0.005% by mass (more than 0%) of Al, 0.008 to 0.04% by mass of O, and 0.002 to 0.03% by mass of N; and the average oxygen concentration in the MnS in the steel is at least 0.4% by mass.

L~invention concerne un acier de décolletage contenant du soufre et à faible teneur en carbone présentant une excellente aptitude à la découpe, ledit acier contenant 0,02 à 0,15 % en poids de C, jusqu~à 0,004 % en poids de Si (0 % en poids exclu), 0,6 à 3 % en poids de Mn, 0,02 à 0,2 % en poids de P, 0,2 à 1 % en poids de S, jusqu~à 0,005 % en poids de Al (0 % en poids exclu), 0,008 à 0,04 % en poids de O, et 0,002 à 0,03 % en poids de N, et la concentration moyenne en oxygène dans MnS étant de 0,4 % en poids ou plus.

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