Alloy 17-4 PH / 1.4542
17-4PH is a well-established precipitation hardening martensitic stainless steel capable of achieving very high strength and hardness after a relatively simple heat treatment. It offers excellent corrosion resistance combined with a structured range of mechanical property levels depending on the precise heat treatment applied.
The materials can be readily machined and fabricated in the softer tempers and can then be heat-treated to exceptional strength and dimensional stability. 17-4PH is widely used in the chemical, petrochemical, offshore, paper, and aerospace industries making best use of its outstanding corrosion resistance, wear resistance, strength and hardness.
Specifications
UNS S17400
AMS 5643, AMS 5604, ASTM A564
Main applications of 1.4542
Surgical and dental instruments, screwdrivers. 17-4 retains the high strength of precipitation-hardening stainless steels. The majority of applications are in aerospace and OAG applications.
- Valves and engine components
- Turbine blades
- Gears
- Shafts
- Aircraft structures
Chemical composition of 1.4542
| Cr | Ni | Cu | C |
|---|---|---|---|
| 15.0 - 17.0 | 3.0 - 5.0 | 3.0 - 5.0 | max 0.070 |
Properties of 1.4542
Annealed:
- Specification values Tensile strength Rm: 1000-1100 MPa
- Elongation A: 5 - 8
Ageing at 480°C:
- Specification values Tensile strength Rm: 1150 - 1350 MPa
- Elongation A: 7 - 15
Heat treatment
The 17-4PH alloy is supplied in a solution annealed condition (condition A). The mechanical properties can be improved by subsequent hardening treatments. These ageing treatments are commonly referred to as conditions H900, H1025, H1075, H1150, H1150M and H1150D.
Mechanical properties of 1.4542
| Condition | UTS | Yield strength | Elongation | Area reduction | Brinell hardness | Rockwell hardness |
|---|---|---|---|---|---|---|
| H900 | 190,000 | 170,000 | 6 | 15 | 388 | C40 |
| H1025 | 155,000 | 125,000 | 8 | 27 | 331 | C35 |
| H1075 | 145,000 | 125,000 | 9 | 28 | 311 | C32 |
| H1150 | 135,000 | 105,000 | 11 | 30 | 277 | C28 |
| H1150M | 115,000 | 75,000 | 14 | 35 | 255 | - |
Delivery programme
Hempel Special Metals is able to supply this grade in the following forms under many conditions:
- Sheets/plates/strips: 0.2 mm < 90 mm
- Bars: 6.35 mm Ø < 250 mm Ø
Weight Calculator
