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 Alloy 17-4 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 572°F while demonstrating good corrosion resistance in all heat treated conditions. Alloy 17-4 has adequate resistance to atmospheric corrosion or in diluted acid salts where its corrosion resistance is equivalent to Alloy 304 or 430. Alloy 17-4 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 17-4 should not be used at temperatures above 572°F or at very low temperatures. Technical data 17-4 Stainless Steel This martensitic precipitation hardening stainless steel has a combination of high hardness and strength after suitable heat treatment. It also has similar corrosion and heat resistance to Grade 304. The two terms "Type 630" and "17-4PH" refer to the same grade. Composition: Carbon: 0.07 max Manganese: 1.00 max Phosphorus: 0.040 max Sulfur: 0.030 max Silicon: 1.00 max Chromium: 15.00 - 17.50 Nickel: 3.00 - 5.00 Copper: 3.00 - 5.00 Iron: Balance Physical Properties: Melting Point: 2560 - 2625°F (1404 – 1440°C) Density: 0.282 lbs/in3 / 7.8 g/cm3 Modulus of Elasticity in Tension: 28.5 X 106 psi / 197 GPa Mechanical Properties: Condition: Solution Treated (A) Tensile Strength Minimum (psi): 160,000 Yield Strength Minimum 0.2% offset (psi): 145,000 % Elongation in 2” Typical: 5% Hardness: Rockwell B85 Condition: Hardened + Aged (TH1050) Tensile Strength Typical (psi): 200,000 Yield Strength Typical 2% offset (psi): 185,000 % Elongation in 2": 8% Hardness: Rockwell C35 Condition: Aged (H1075) Tensile Strength Typical (psi): 175,000 Yield Strength Typical 2% offset (psi): 165,000 % Elongation in 2": 8% Hardness: Rockwell C37 Condition: Aged (H900) Tensile Strength Typical (psi): 210,000 Yield Strength Typical 2% offset (psi): 200,000 % Elongation in 2": 7% Hardness: Rockwell C45