．Ni-resist Cast Iron

● Ni-resist Cast Iron

　It is designed with major alloys, Ni about 13~16%, Cu about 5.5~7.5%, and Cr about 2.0~3.0%. After casting, it undergoes heat treatment to turn cast iron base to austen, whose major mechanical features:

Tensile strength：170~280kgf/mm²
Hardness：HB130~200 ( HRB73~93)
0~200T℃ expansion factor is about 16~21 It is now generally used for the design of the durable ring on piston.