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焼結体被削性に優れた合金鋼粉

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川崎製鉄技報

KAWASAKI STEEL GIHO Vol.33 (2001) No.4 自動車用鋼管・鉄粉特集号

焼結体被削性に優れた合金鋼粉

Alloyed Steel Powder for Sintered Compacts with Excellent Machinability 宇波 繁 (Unami, S.) 上ノ薗 聡 (Uenosono, S.) 藤長 政志 (Fujinaga, M.) 要旨 :

KIP シグマロイ 2010(2%Ni-1%Mo 部分合金化鋼粉)は,KIP シグマロイ 415S(4% Ni-1.5%Cu-0.5%Mo 部分合金化鋼粉)に比べて,焼結体でのドリル穿孔性,旋盤加工性が 優れている。これは,KIP シグマロイ 2010 を用いた焼結体は,KIP シグマロイ 415S に 比べ,硬さが低いことと,Ni が濃化した靭性の高いオーステナイト相が少ないためである。 また,KIP シグマロイ 2010 は,KIP シグマロイ 415S に比べ,焼結浸炭材での硬度が高 く,大きな圧環強度が得られる。これは,オーステナイトのマルテンサイトへのひずみ誘 起変態挙動に起因する。 Synopsis :

The sintered compacts made from KIP SIGMALOY 2010 (2%Ni-1%Mo partially alloyed steel powder) attain superior machinability in drilling and turning to those made from KIP SIGMALOY 415S (4%Ni-1.5%Cu-0.5%Mo partially alloyed steel powder). The excellent machinability is attributed to the lower hardness and the reduction of Ni-rich tough austenite of the sintered compact made from KIP SIGMALOY 2010. After case-hardening the same sintered compacts made from KIP SIGMALOY 2010 attain higher hardness and radial crushing strength than those made from KIP SIGMALOY 415S due to strain induced martensitic transformation of austenite.

(c)JFE Steel Corporation, 2003

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