High nickel ductile iron d-2 ASTM a439-1983. D-2 is used for manufacture of stem nuts for API and JIS valves.The microstructure of high nickel cast iron is spheroidal graphite distributed on the austenitic body with a small amount of carbides, so it has good high temperature resistance, corrosion resistance and wear resistance.Material properties
| yield strength(Mpa) | elongation(%) | hardness(HB) |
| ≥207 | ≥8 | 139~202 |
High nickel nodular cast iron is mainly used in heat resistant components such as turbine engine, turbocharger housing and pump body. It has excellent corrosion resistance due to its Ni content. Good wear resistance and heat resistance due to Cr; It has excellent corrosion resistance to sulfuric acid, dilute hydrochloric acid, organic acid, alkali solution, seawater, halogen, salt solution, Marine atmosphere, hydrogen sulfide and other media.