Stainless 17-4 PH® (UNS S17400)
Description
17-4 PH® is a martensitic precipitation hardening stainless steel offering high strength and hardness along with moderate corrosion resistance up to 600˚F. It has good fabrication characteristics and can be age hardened using a single heat treatment in the 900-1150˚F temperature range. This grade has been used for a variety of oil field and chemical process equipment, as well as fittings and fasteners.
Chemical Composition
Chemical Composition (wt%) limits as specified in ASTM A693 (Type 630)*
| Element | 17-4 PH |
| Carbon | 0.07 |
| Chromium | 15.0-17.5 |
| Nickel | 3.0-5.0 |
| Copper | 3.0-5.0 |
| Manganese | 1.00 |
| Silicon | 1.00 |
| Phosphorus | 0.040 |
| Sulfur | 0.030 |
| Columbium + Tantalum | 0.15-0.45 |
*Maximum, unless range is indicated
Physical Properties
Physical properties for 17-4 PH stainless steel
| Density, lb/in3 | 0.280 |
| Modulus of Elasticity, psi | 28.5 x 106 |
| Coefficient of Thermal Expansion, 68-212˚F, /˚F | 6.0 x 10-6 |
| Thermal Conductivity, Btu/ft hr ˚F | 10.6 |
| Specific Heat, Btu/lb ˚F | 0.11 |
| Electrical Resistivity, Microhm-in | 38.6 |
Mechanical Properties
Mechanical property requirements for solution treated product (Condition A) as specified in ASTM A693.
| Property | 17-4 PH |
| Yield Strength, min. (ksi) | - |
| Tensile Strength, min. (ksi) | - |
| Elongation, min. (%) | - |
| Hardness, max. (HBW) | 38 |
Standards
Typical standards for 17-4 PH stainless steel
| ASTM A693 (listed as Grade 630) |
| AMS 5604 |