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15-5Ph is a precipitation hardening martensitic stainless-steel considered of being a compositional modification of 17-4 with minimal delta ferrite. 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. It is favored over 17-4 when transverse properties are of concern.
| Weight % | C | Mn | Si | Cr | Ni | P | S | Cu | Nb | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| minimum | — | — | — | 14.00 | 3.50 | — | — | 2.50 | 0.15 | Remainder |
| maximum | 0.07 | 1.00 | 1.00 | 15.50 | 5.50 | 0.04 | 0.03 | 4.50 | 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) |
0.10 BTU/lb – °F | 420 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 |
6.3 micro in/in- °F | 11.4 micro m/m- °K | ||
| Thermal conductivity
|
100°C | 10.3 BTU/ft- hr – °F | 17.8 W/m – °K | |
| 500°C | 13.1 BTU/ft- hr – °F | 23 W/m – °K | ||
| Electrical properties | Electrical resistivity | 770 nΩ ∙ m | ||
| Magnetic parambility | 95 | |||
| Condition | Tensile | Hardness | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Ultimate | Yield | Elongation | Reduction
in area, % |
HRC | |||||
| 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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