Alloy 17-4PH, Similar to 630 Alloy, is a chromium-copper precipitation hardening stainless steel that is used for applications requiring high strength and a moderate level of corrosion resistance.
17-4PH annealed stainless steel is one of the most widely used precipitation hardening grades, as it has high strength hardness up to about 572°F while demonstrating good corrosion resistance in all heat treated conditions. 630/ 17-4PH annealed stainless steel has adequate resistance to atmospheric corrosion or in diluted acid salts where its corrosion resistance is equivalent to Alloy 304 or 430. 630/ 17-4PH annealed stainless steel plates 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 180 ksi can be achieved. Alloy 17-4PH should not be used at temperatures above 572°F or at very low temperatures.
Specifications: UNS S17400
ASTM/ASME: UNS S17400
EURONORM: X5CrNiCuNb16.4
AFNOR: Z6CNU17-04
DIN: 1.4542
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