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17-7Ph is a precipitation hardening martensitic stainless steel that provides high strength and hardness, excellent fatigue properties, good corrosion resistance, good formability, and minimum distortion upon heat treatment.
The alloy provides valuable property combinations, particularly suited for aerospace applications. This special alloy also provides benefits for other applications requiring high strength and good corrosion resistance, as well as excellent properties for flat springs at temperatures up to 600°F (316°C).
| Weight % | C | Mn | Si | Cr | Ni | P | S | Al | Fe |
|---|---|---|---|---|---|---|---|---|---|
| minimum | — | — | — | 16.00 | 6.50 | — | — | 0.75 | Remainder |
| maximum | 0.09 | 1.00 | 1.00 | 18.00 | 7.75 | 0.04 | 0.03 | 1.50 |
| Characteristics | English | Metric | ||
|---|---|---|---|---|
| Nominal density
(68°F/20°C) |
0.28 lbs/in3 | 7.80 g/cm3 | ||
| Melting range | 2560°F-2625°F | 1400°C-1440°C | ||
| Specific heat
(212 °F/100°C) |
0.11 BTU/lb – °F | 460 J/KG- °K | ||
| Coefficient of thermal expansion | 32°F – 212°F
0°C – 100°C |
6.1 micro in/in- °F | 11.0 micro m/m- °K | |
| 32°F – 600°F
0°C – 315°C |
6.4 micro in/in- °F | 11.6 micro m/m- °K | ||
| Thermal conductivity
|
100°C | 9.5 BTU/ft- hr – °F | 16.4 W/m – °K | |
| 500°C | 12.6 BTU/ft- hr – °F | 21.8 W/m – °K | ||
| Electrical properties | Electrical resistivity | 830 nΩ ∙ m | ||
| Magnetic parambility | — | |||
| Condition | Tensile | Hardness | Fracture toughness | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Ultimate | Yield | Elongation | Reduction in area, % | HRB | |||||
| KSI | MPa | KSI | MPa | Lo | Lo | Min | |||
| RH950 | 185 | 1275 | 150 | 1030 | 6 | 10 | 41 | 69 | 76 |
| TH1050 | 170 | 1170 | 140 | 965 | 6 | 25 | 38 | — | — |
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