Understanding ASTM A564: The Definitive Guide to Precipitation-Hardening Stainless Steel

A "ferrite-free" version of 17-4 PH, providing better transverse toughness. Typical Applications

A double-aging process used to achieve the most compliant, machinable state for severe forming operations. Mechanical Properties

Below is an overview of the typical chemical boundaries for the most common grade, : Weight % (Type 630 / UNS S17400) Carbon (C) Manganese (Mn) Phosphorus (P) 0.040% max Sulfur (S) 0.030% max Silicon (Si) Chromium (Cr) 15.00% – 17.50% Nickel (Ni) 3.00% – 5.00% Copper (Cu) 3.00% – 5.00% Columbium + Tantalum (Nb + Ta) 0.15% – 0.45% Heat Treatment and Aging Conditions

Understanding ASTM A564: The Standard for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes