| 摘要 |
PROBLEM TO BE SOLVED: To produce a free cutting Ni based heat resistant alloy which has satisfactory high temperature strength and corrosion resistance, and has excellent machinability. SOLUTION: This Ni based heat resistant alloy contains Ni as the main component, and contains, by mass, 0.01 to 0.3% C and 14 to 35% Cr. The alloy contains one or more kinds selected from Ti, Zr and Hf by 0.1 to 6% in total, and contains 0.015 to 0.5% S. By these additional elements, a free cutting impartation compound phase containing any of Ti, Zr and Hf as the main component of metallic element components, and, as bonding components with the metallic element components, essentially consisting of C, and containing either S or Se is dispersedly formed into the structure. Further, provided that the content of Ti is defined as WTi (mass%), the content of Zr as WZr (mass%), the content of Hf as WHf (mass%), the content of C as WC (mass%), and the content of S as WS (mass%), WTi+0.53WZr+0.27WHf>2WC+0.75WS, and WC>0.37WS are satisfied. In this way, free S present in the alloy structure is suppressed, and its machinability can be improved while preventing deterioration in hot workability.
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