We kept ex stock of Stainless Steel 17-4PH export bright and black bar rod. Size are available from 5mm Dia to 250mm Dia in Imported and Indian make. Precipitation Hardening also known as Type 630 is a chromium-copper precipitation hardening stainless steel round bar used for applications requiring height strength and a moderate level of co7-4 Precipitation Hardening also known as Type 630 is a chromium-copper precipitation hardening stainless steel round bar used for applications requiring height strength and a moderate level of corrosion resistance.