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17-4 Precipitation Hardening also known as Type 630 is a chromium-copper
precipitation hardening stainless steel used for applications requiring
high strength and a moderate level of corrosion resistance. High
strength is maintained to approximately 600 degrees Fahrenheit (316
degrees Celsius).
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Alloy 17-4 PH is a precipitation hardening martensitic stainless steel with Cu and Nb/Cb additions. The grade combines high strength, hardness (up to 572°F / 300°C), and corrosion resistance.
Mechanical properties can be optimized with heat treatment. Very high yield strength up to 1100-1300 MPa (160-190 ksi) can be achieved.
The grade should not be used at temperatures above 572°F (300°C) or at very low temperatures. It has adequate resistance to atmospheric corrosion or in diluted acids or salts where its corrosion resistance is equivalent to Alloy 304 or 430.
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