17-4PH ANNEALED STAINLESS STEEL

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.

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