| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.16 ( June 1987 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Cr-Alloyed Steel Powders with Low Oxygen
Content Manufactured by Vacuum Annealing
Process Nobusuke Yamato, Kuniaki Ogura, Eiji Hatsugai, Yoshiaki Maeda |
| Synopsis: Kawasaki steel began to produce alloyed steel powders, KIP 4100V and KIP 4100VS, which are equivalent to AISI 4100. New facilities were constructed in Chiba Works in 1985. They consist of wateratomization and vacuum annealing processes for manufacturing alloyed steel powders. Generally, it is difficult to deoxidize Mn-Cr alloyed steel powders by the gas reduction method. But we succeeded in producing alloyed steel powders with low O, C and N contents (0.10% O, 0.02% C, 0.001% N) by a newly developed process named VALCON (Vacuum annealing process for alloyed steel powders with low carbon, oxygen and nitrogen). These powders obtained by this method are better in compressibility and compactibility (green density of 7.14 g/cm3, and Rattler value of 0.44% at compating pressure of 7 t/cm2), especially possessing the advantage of high strength after heat treatment. These features are suitable for high strength sintered parts for heat and wearresistance. |
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