| 摘要 |
PURPOSE:To obtain medium or high carbon metallic powder having a desired carbon content by manufacturing atomized metallic powder with a soln. contg. a carbonaceous component as an atomizing medium and by decarburizing the powder while inhibiting oxidation. CONSTITUTION:Metallic powder contg. >=0.1% C and <=0.2% O2 is manufactured by an atomizing method with a soln. contg. a carbonaceous component having carburizing power such as mineral oil as an atomizing medium. The C content in the atomized metallic powder is then regulated to 0.1-0.6% by decarburizing the powder in a decarburizing atmosphere of H2 or CO-O2 while inhibiting oxidation. By this method, metallic powder of medium or high carbon steel suitable for sintering and forging, hot extrusion or other process is obtd. The decarburization is preferably carried out at 650-1,250 deg.C in an atmosphere of H2 or at 630-1,250 deg.C in an atmosphere of CO-O having >=0.05 Pco.
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