17-4PH
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Description
Scope of supply of Aviation Group:
Non-standard forgings, round rods, steel plates, rings, seamless pipes
- 17-4PH material introduction
17-4PH alloy is precipitated, hardened, martensite stainless steel composed of copper, niobium/cinnabar.
Corresponding grade: 0Cr17Ni4Cu4Nb 05Cr17Ni4Cu4Nb S17400
- 17-4PH chemical composition
| alloy | % | C | Mn | And | P | S | Cr | In | Cu | Fe | Nb |
| 17-4ph | Minimum value | – | – | – | – | – | 15.5 | 3.0 | 3.0 | margin | 0.15 |
| Maximum value | 0.07 | 1.0 | 1.0 | 0.040 | 0.030 | 17.5 | 5.0 | 5.0 | 0.45 |
- 17-4PH physical properties
| density | 7.78g/cm3 |
| Melting point | 1400-1440℃ |
Mechanical properties of 17-4PH alloy at room temperature:
| alloy | Tensile strength Rm N/mm2 |
Yield strength RP0.2N/mm2 |
Elongation A5 % |
Brinell hardness HB |
| 480℃ aging | ≥1310 | ≥1180 | ≥10 | ≥40 |
| 550℃ aging | ≥1060 | ≥1000 | ≥12 | ≥35 |
| 580℃ aging | ≥1000 | ≥865 | ≥13 | ≥31 |
| Aging effect of 620℃ | ≥930 | ≥325 | ≥16 | ≥28 |
- 17-4PH corrosion resistance
- The corrosion resistance of 17-4PH alloy is better than any other standard hardenable stainless steel plate. In most cases, its corrosion resistance is no less than 304.
- If there is a risk of stress corrosion cracking, the higher aging temperature must be above 550°C (1022°F), preferably 590°C (1094°F).
- The tempering temperature in the chloride medium is 550°C-1022°F.
- The tempering temperature in H2S medium is 590°C-1094°F.
- It is susceptible to corrosion or crack corrosion in static seawater.
- Its corrosion resistance is the same as the 304L grade in petrochemical, food processing and paper industry.
- 17-4PH application fields
- Maritime platform, helicopter deck, other platforms
- Food Industry
- Pulp and paper industry
- Aerospace (turbine blades)
- Mechanical components
