Low-sulfur, lead-free alloy

Details Low-sulfur, lead-free alloy Low-sulfur, lead-free alloy

1988-11-15

1989-09-12

Rosenberg, Peter D.

Alloys or metallic compositions

Ferrous

Lead, bismuth, selenium, tellurium or calcium containing

420 84, C22C 3954

Patent

active

048658057

ABSTRACT:
Composition and method for producing a low-sulphur, free-machining steel, substantially free of lead and including in weight percent about 0.05-0.40 copper, 0.005-0.040 tellurium, 0.002-0.35 bismuth, 0.002-0.05 tin, up to 0.55 carbon, and less than 0.25 sulphur, traces (up to about 0.005 weight percent) of barium, and the balance being iron. The elements bismuth, tellurium and tin are added as a molten alloy to the molten steel and uniformly distributed therethrough. The elements copper and barium can be added separately into the steel stream ahead of the molten addition inflow. The mass is then cooled to provide a solid metal casting substantially free of blemishes and free of surface checking and tearing. The casting is characterized by enhanced machining properties.

REFERENCES:
patent: 4147533 (1979-04-01), Flinn
patent: 4751047 (1988-06-01), Yoshida

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