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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.
Main fields of application of 1.4542
Surgical and dental instrument, screwdriver.
17- 4 retains a high strength of precipitation hardening stainless steels a majority of applications are within the aerospace sector and OAG applications
- Valves and engine components
- Turbine blades
- Gears
- Shafts
- Aircraft structures
Chemical composition of 1.4542
| Cr | 15,0 - 17,0 |
| Ni | 3,0-5,0 |
| Cu | 3,0-5,0 |
| C | max 0,070 |
Characteristics of 1.4542
| annealed | specification values |
| tensile strength Rm | 1000-1100 MPa |
| elongation A | 5 - 8 |
| Aged at 480 ⁰C | specification values |
| tensile strength Rm | 1150 – 1350 MPa |
| elongation A | 7 - 15 |
Heat treatment
Alloy 17-4PH is provided in the solution-annealed condition (Condition A). Mechanical properties may be improved by subsequent age hardening treatments. These aging treatments are commonly described as conditions H900, H1025, H1075, H1150, H1150M and H1150D.
Mechanical Properties
| Condition | UTS | 0.2% Yield | Elongation | Reduction of area | Hardness Brinel |
| H900 | 190.000 | 170.000 | 10 | 40 | 388 |
| H1025 | 155.000 | 145.000 | 12 | 45 | 331 |
| H1075 | 145.000 | 125.000 | 13 | 45 | 311 |
| H1150 | 135.000 | 105.000 | 16 | 50 | 277 |
| H1150m | 115.000 | 75.000 | 18 | 55 | 255 |
| H1150-D | 125.000 | 105.000 | 16 | 50 | 255 |
