17-4 PH stainless steel( 630 ) is a chromium-copper precipitation hardening stainless steel material 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).
General Properties
Stainless steel 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.
Chemistry Data:
Carbon | 0.07 max |
Chromium | 15 - 17.5 |
Copper | 3 - 5 |
Iron | Balance |
Manganese | 1 max |
Nickel | 3 - 5 |
Niobium | 0.15 - 0.45 |
Niobium+Tantalum | 0.15 - 0.45 |
Phosphorus | 0.04 max |
Silicon | 1 max |
Sulphur | 0.03 max |
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