Phosphorus steel powder and a method of manufacturing the same

Details Phosphorus steel powder and a method of manufacturing the same Phosphorus steel powder and a method of manufacturing the same

1976-10-26

1978-06-06

Stallard, W.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 05AA, 75 05BA, 75251, 75252, B22F 100

Patent

active

040934497

ABSTRACT:
A phosphorus steel powder for manufacturing sintered details having an extremely small tendency to brittleness ruptures consists of iron or steel powder substantially free from phosphorus, mixed with a phosphorus powder characterized by a maximum particle size of 20 .mu.m, preferably a maximum particle size of 10 .mu.m. The phosphorus content of the ferrophosphorus powder shall exceed 2.8% and in order to reduce the wearing of the tools the phosphorus content shall be less than 17%. If the ferrophosphorus powder is manufactured by grinding piece goods the phosphorus content shall exceed 12% and shall preferably be between 14 and 16%. The phosphorus content of the preferred mixture is between 0.2 and 1.5%. The iron-ferrophosphorus mixture is heated with or without the addition of oil in reducing atmosphere to a temperature of between 650.degree. and 900.degree. C for a period of 15 minutes to 2 hours to improve the protection against segregation.

REFERENCES:
patent: 3357817 (1967-12-01), Harnisch et al.
patent: 3836355 (1974-09-01), Lindskog et al.
patent: 3839014 (1974-10-01), Cziska et al.

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