General Information
Chemical Composition
Physical Properties
Mechanical Properties
General Information
Type 17-4 PH stainless steel is the most widely used of all of the precipitation-hardening stainless steels. Its valuable combination of properties gives designers opportunities to add reliability to their products while simplifying fabrication and often reducing costs. Type 17-4 PH is a martensitic precipitation-hardening stainless steel that provides an outstanding combination of high strength, good corrosion resistance, and good mechanical properties at temperatures up to 316°C (600°F). Its unique combination of properties make this alloy an effective solution to many design and production problems.
HEAT TREATMENT
Grade 17-4 stainless steel is soaked at 1038°C (1900°F) for 30 min and cooled below 16°C (60°F) for complete martensite transformation in the condition A. The condition material is treated at 482°C (900°F) for 1 h followed by cooling. Solution treated material is soaked for 4 h at specific temperature in H925, H1025, H1075, H1100, and H1150 conditions followed by cooling in air.
Solution treated material is soaked at 760°C (1400°F) for 2 h in the H1150M condition followed by cooling. It is again heated at 620°C (1150°F) for 4 hours followed by cooling.
Common Applications of 17-4 PH
- Gate valves
- Chemical processing equipment
- Firearms production
- Pump shafts, gears, plungers
- Valve stems, balls, bushings, seats
- Fasteners
Standard Inventory Specifications
- UNS S17400
- AMS 5643
- ASTM A564
- ASTM A693 Grade 630
- NACE MR0175/MR0103 (H-1150D Condition)
Chemical Composition
Chemical Properties of 17- 4 PH stainless
Element
Percent by Weight
Cr
Chromium
15 – 17.5%
Ni
Nickel
3.0 – 5.0%
Si
Silicon
1.0% max
P
Phosphorus
0.04% max
S
Sulfur
0.03% max
C
Carbon
0.07% max
N
Nitrogen
0.15-0.45%
Mn
Manganese
1.0%
Cu
Copper
3.0 – 5.0%
Fe
Iron
Balance
Physical Properties
Physical properties of 17-4 ph stainless
Physical property | Value |
Density | 0.28 lb/in3 |
Melting Range | 2560 – 2625 °F |
Specific Heat Capacity at 70°F | 0.11 Btu/lb/°F |
Thermal Conductivity at 212°F | 10.6 Btu/hr-ft-°F |
Poisson’s Ratio | |
Elastic Modulus at 72°F | 28.5 x 106psi |
Mechanical Properties
Mechanical properties of 17 – 4 ph
Heat Treatment | Yield Strength 0.2% Offset | Ultimate Tensile Strength | Elongation | ||||
(MPa) | ksi | (MPa) | ksi | % | |||
Hardening 496 °C (925 °F) 4 h, air cooling | Min. | 1070 | 155 | 1170 | 170 | 8 | |
type. | 1207 | 175 | 1310 | 190 | 140 | ||
Hardening 593 °C (1100°F) 4 h, air cooling | Min. | 790 | 115 | 965 | 140 | 10 | |
type. | 931 | 135 | 1034 | 150 | 17 |
- 17-4 PH Pipes
- 17-4 PH Fittings
- 17-4 PH Bars
- 17-4 PH Sheets & Plates
- 17-4 PH Coils & Strips
- 17-4 PH Wires

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