The 17-4PH steel (UNS S17400) is a chromium-copper precipitation hardening stainless steel that is used for applications requiring high strength and a moderate level of corrosion resistance. It is one of the most widely used precipitation hardening grades, as it has high strength hardness up to about 300°C while demonstrating good corrosion resistance in all heat treated conditions. The 17-4PH steel has adequate resistance to atmospheric corrosion or in diluted acid salts where its corrosion resistance is equivalent to 304 steel or 430. The 17-4PH steel can be heat treated to a variety of temperatures to develop a wide range of properties. Its mechanical properties can be optimized with heat treatment where very high yield strength up to 1240Mpa can be achieved. The 17-4PH should not be used at temperatures above 300°C or at very low temperatures. It is one of the most widely used precipitation hardening grades, as it has high strength hardness up to about 300°C while demonstrating good corrosion resistance in all heat treated conditions. The 17-4PH steel is available at CHUN & VOLLERIN in the following formats: Bars, Plates.