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17-4Ph is a precipitation hardening martensitic stainless-steel. A wide range of mechanical properties is available via simple aging within a 900-1150°F (482-621°C) temperature range. Vacuum arc re-melting provides low gas content, superior cleanliness and optimum transverse properties.
Typical applications include aircraft and missile structural components, gears, valves, fasteners, jet engine and nuclear reactor parts.
| Weight % | C | Mn | Si | Cr | Ni | P | S | Cu | Nb | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| minimum | — | — | — | 15.50 | 3.00 | — | — | 3.00 | 0.15 | Remainder |
| maximum | 0.07 | 1.00 | 1.00 | 17.50 | 5.00 | 0.04 | 0.03 | 5.00 | 0.45 |
| 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 |
6.0 micro in/in- °F | 10.8 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 | 10.6BTU/ft- hr – °F | 18.3W/m – °K | |
| 500°C | 13.1 BTU/ft- hr – °F | 23 W/m – °K | ||
| Electrical properties | Electrical resistivity | 800 nΩ ∙ m | ||
| Magnetic parambility | 95 | |||
| Condition | Tensile | Hardness | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Ultimate | Yield | Elongation | Reduction
in area, % |
HRB | |||||
| KSI | MPa | KSI | MPa | %
Average |
Lo | Tr | Min | Max | |
| H900 | 190 | 1310 | 170 | 1170 | 5-10 | — | — | 40 | 48 |
| H1100 | 140 | 965 | 115 | 790 | 5-14 | — | — | 29 | 40 |
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