Ni-Resist
What is Sphero Ni-Resist casting?
By alloying the SG iron with Nickel, a stable austenitic nodular iron is produced which shows excellent resistance to growth and oxidation up to 925 ° C. The main application of Ni-Resist is Gas Turbines and Automotive Exhaust and Turbocharging Systems where the temperature varies between 500 and 1050C. Ni-Resist is suitable in these applications, because its ductility, hot force and low thermal expansion coefficient provide the best resistance to such severe thermal shocks. Physical properties depend on operating temperatures and the complete nickel composition of the SG iron alloy.
Properties:
Tensile Strength(Rm) 380 to 500 N / mm 2
Protected Stress (Rp0.2) 210 270 N / mm 2
Elongation (A) 10% 20
Flexibility (E) module 130 kN to 150 / mm 2
Brinell Hardness130 170H
MetallurgyHeat treatment has the effect of changing the metallic matrix to thin ferrite needles in an iron and carbon solution, also known as ausferite.
