| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly corrosion resistant alloy which is nonmagnetic and has high hardness relating to a nonmagnetic high-hardness alloy made of an Ni-based alloy having excellent wear resistance and corrosion resistance. SOLUTION: A nonmagnetic rod 10 having the hardness sufficiently higher than that of a base material is obtained by cold plastic working in a swaging process 24 and heat treatment in a subsequent process 26. Also, since the Ni-based alloy composition which is the base material is composed of Ni as a principal component, appropriate magnetic characteristics, i.e. low magnetic permeability of about 1.003 can be obtained. Even more, the magnetic permeability is not increased by cold or warm plastic working, unlike austenitic stainless steel represented by SUS304. Since the Ni-based alloy composition contains 30 to 45 wt.% Cr, the high corrosion resistance can be obtained. Since the Ni-based alloy composition which is the base material does not contain expensive metals, the relatively inexpensive high-hardness alloy can be obtained. COPYRIGHT: (C)2007,JPO&INPIT
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