March 26, 2026March 26, 2026 17-4 PH Stainless Steel: Properties, Heat Treatment, and CNC Machining Guide 17-4 PH Stainless Steel: Properties, Heat Treatment, Machining, and Industrial Applications 17-4 PH stainless steel (also known as AISI 630, UNS S17400, or DIN 1.4542) is one of the most ...