Stainless steel 17-4PH ( AISI630,SUS630, S17400, DIN1.4542) is a precipitation hardening martensitic stainless steel with Cu and Nb additions. This material combines high strength and hardness, with good corrosion resistance. Mechanical properties can be optimized with heat treatments. The materials are generally used for parts requiring corrosion resistance and high strength at room temperature.  It is suitable for machining in the solution-annealed, cold-worked and age-hardened condition. Standard: ASTM A564, A705, A693. We offer the materials in forms of stainless steel round rod, stainless steel square bar, stainless steel hexagon bar, stainless steel wire rod, stainless steel forging, stainless steel flat bar, stainless steel forged cylinder, stainless steel forged sleeves, stainless steel forged rings, stainless steel forged tube sheet.