| 摘要 |
PURPOSE:To obtain a stainless sintered material with high hardness by sintering stainless steel powder by heating in a reducing atmosphere of a gaseous mixture contg. a specified percentage of nitrogen basing on the volume of hydrogen and by cooling the sintered material in the same atmosphere. CONSTITUTION:Austenitic stainless steel powder is sintered in a sintering zone by heating to a prescribed temp. in a reducing atmosphere of a gaseous mixture contg. 50-70% nitrogen basing on the volume of hydrogen. The sintered material is cooled in a cooling zone in the same atmosphere. By this method a nitrided layer is formed on the sintered material with nitrogen in the sintering stage to improve the strength of the sintered material.
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