Method of manufacturing sintered steel for components

Details Method of manufacturing sintered steel for components Method of manufacturing sintered steel for components

B - Operations, Transporting

22

F

75/157

B22F 3/16 (2006.01) C22C 33/02 (2006.01)

Patent

CA 1094362

Abstract of the Disclosure A method is provided for the powder metallurgical manufacture of precision components from sintered steel using phosphorus without the usual drawback of shrinkage of the green compacts during sintering. An iron based powder mixture containing, in addition to iron, 0.65 to 1.1 weight-% phosphorus, up to 0.6 weight-% carbon or graphite powder, and a lubricant is compressed into green compacts and sintered at a temperature in the range 950 - 1250°C for 5 to 90 minutes in a reducing atmosphere having such a carbon potential that the sintered compacts have a carbon content of between 0.05 and 0.6 weight-%. The dimensional change during sintering is negligible and the steel resulting has both high strength and ductility.

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