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Except for the presence of trace amounts of copper, aluminium, phosphorus, or titanium, PH alloys are similar to other stainless steel and nickel-based alloys. After forming a part from a PH alloy, it is subjected to an age-hardening process, during which these elements precipitate as hard intermetallic compounds, significantly increasing the hardness and strength of the part.
Stainless steels are sometimes referred to as high-alloy steels. These steels exhibit superior corrosion resistance in comparison to other steels due to their higher chromium content. Stainless steels are classified into three groups according to their crystalline structure. These are the martensitic, austenitic, and ferritic groups.
PH 17-4 Stainless steel is a martensitic precipitation-hardening steel that combines exceptional strength, corrosion resistance, good mechanical properties at temperatures up to 600 °F (316 °C), toughness in both the base metal and welds, and quick, low-temperature heat treatments that minimise warpage and scaling.
Precipitation-hardened steels are a fourth class of stainless steels comprised of martensitic and ferritic steels. Stainless steel grade 13-8 is a precipitation hardenable stainless steel. This steel exhibits excellent resistance to stress and general corrosion cracking, as well as high transverse toughness and strength, all of which are achieved through a single low temperature heat treatment. The following datasheet discusses stainless steel grade 13-8 in detail.
| Composition | wt% |
|---|---|
| Carbon(C) | 0.07max |
| Manganese(Mn) | 1.00max |
| Phosphorus(P) | 0.040max |
| Sulfur(S) | 0.030max. |
| Silicon(Si) |
| UTS,ksi.(MPa) | 160(1103) | 200(1379) | 190(1310) | 170(1172)( | 165(1138) | 150(1034) | 137(945) |
|---|---|---|---|---|---|---|---|
| 0.2%YS,ksi.(MPa) | 115(793) | 185(1275) | 175(1207 | 165(1138) | 160(1103) | 130(896) | 111(765) |
| Elongation %in 2"(50.8mm) | 5 | 9 | 9 | 10 | 11 | 12 | 17) |
| RockwellHardnessC | 35 | 45 | 43 | 38 | 37 | 33 | 31 |
| UTS,ksi.(MPa) | 185max.(1276) | 190min.(1310) | 170min.(1172) | 155min.(1069)( | 145min.(1000) | 140min.(965) | 135min.(931) |
|---|---|---|---|---|---|---|---|
| 0.2%YS,ksi.(MPa) | 160max.(1103) | 170min.1172) | 155min.(1069) | 145min.(1000) | 125min.(862) | 115min.(790) | 105min.(724) |
| Elongation %in 2"(50.8mm) | 3min. | 5min. | 5min. | 5min. | 5min. | 5min. | 8min. |
| RockwellHardnessC | 38max. | 40–48 | 38–46 | 35–43 | 31–40 | 31–40 | 28–38 |