What is 17-4 PH Stainless Steel?
17-4 PH is a precipitation hardening martensitic stainless steel. It is an American aerospace grade that contains 4% copper. It can be supplied in the annealed condition (condition A - although it should not be used in the annealed condition) or heat treated.
Heat treated conditions:
- Condition H900 (900°F)
- Condition H925 (925°F)
- Condition H1025 (1025°F)
- Condition H1075 (1075°F)
- Condition H1100 (1100°F)
- Condition H1150 (1150°F)
Stainless steel 17-4 PH has good machinability in the annealed condition - similar to that of stainless 304. Machining does become more difficult after hardening heat treatment.
Carbide or high speed steel tools should be used along with standard lubrication.
You may also see 17-4 PH referred to as:
- 1.4542
- UNS S17400
- Grade 630
- S17400
- AISI 630
- NACE MR 0175
- ASTM A484
- ASTM A564
- AMS2303
- AMS5643
- AMS5643H1150
- ASME SA564
- X5CrNiCuNb16-4
Main attributes
- High tensile strength
- High yield strength
- Excellent hardness
- Good corrosion resistance - on par with the more readily available stainless 304
- Outstanding wear resistance
- Good mechanical properties up to 316°C
- Good welding characteristics
Common Applications
- Fasteners & hardware
- Valves & pumps
- Turbine blades
- Undercarriage components
- Missile parts
- Springs
- Gears & driveshafts
- Bearings & bushings
- Wear parts & rings
- Chemical processing & storage equipment
Technical properties
17-4 PH Stainless Steel Physical Properties
| Physical Properties | Value |
| Density | 7.75 g/cm³ |
| Thermal Expansion | 10.8 x10^-6 /K |
| Modulus of Elasticity | 196 GPa |
| Thermal Conductivity | 18.4 W/m.K |
| Electrical Resistivity | 0.08 x10^-6 Ω .m |
Bar - Solution Annealed - Up to 100mm Dia / Thickness - Spec: EN 10088-3:2005
| Mechanical Properties | Value |
| Tensile Strength | 1200 MPa |
| Hardness Brinell | 360 Max HB |
Bar - at P800 - Up to 100mm Dia / Thickness - Spec: EN 10088-3:2005
| Mechanical Properties | Value |
| Proof Stress | 520 Min PA |
| Tensile Strength | 800 to 905 MPa |
| Elongation A | 18 Min % |
Bar - at P930 - Up to 100mm Dia / Thickness - Spec: EN 10088-3:2005
| Mechanical Properties | Value |
| Proof Stress | 720 Min PA |
| Tensile Strength | 930 to 1100 MPa |
| Elongation A | 16 Min % |
Bar - at P960 - Up to 100mm Dia / Thickness - Spec: EN 10088-3:2005
| Mechanical Properties | Value |
| Proof Stress | 790 Min PA |
| Tensile Strength | 960 to 1160 MPa |
| Elongation A | 12 Min % |
Bar - at P1070 - Up to 100mm Dia / Thickness - Spec: EN 10088-3:2005
| Mechanical Properties | Value |
| Proof Stress | 1000 Min PA |
| Tensile Strength | 1070 to 1270 MPa |
| Elongation A | 10 Min % |
Typical chemical composition (weight %)
| Weight (%) | Manganese | Iron | Carbon | Phosphorous | Silicon | Sulphur | Chromium | Nickel | Copper | Molybdenum | Niobium
(Columbium) |
| min. | 0.00 | Bal | 0.00 | 0.00 | 0.00 | 0.00 | 15 | 3.00 | 3.00 | 0.00 | 0.00 |
| max. | 1.50 | Bal | 0.07 | 0.04 | 0.70 | 0.03 | 17 | 5.00 | 5.00 | 0.60 | 0.45 |
Contact us
