AISI 630
AISI 630. In English-speaking countries, the following materials are known under AISI 630: 1.4542 - X5CrNiCuNb16-4. 1.4548 - X5CrNiCuNb17-4-4. Alloy 17-4 PH. AISI 630 is a hardenable, martensitic stainless steel with high wear resistance, good corrosion resistance and high yield strength.