SHANGHAI UNITE STEEL
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| Element | Percent By Weight | |
|---|---|---|
| C | Carbon | 0.07 maximum |
| Cr | Chromium | 14 - 15.5 |
| Cu | Copper | 2.5 - 4.5 |
| Fe | Iron | Balance |
| Si | Silicon | 1.00 maximum |
| S | Sulfur | 0.03 maximum |
| Ni | Nickel | 3.5 - 5.5 |
| Mn | Manganese | 1.0 maximum |
| P | Phosphorus | 0.04 maximum |
| Nb Ta |
Niobium plus Tantalum |
0.15 - 0.45 |
15-5 stainless steel is a martensitic, precipitation-hardening material with chromium, nickel and copper. It is often a first choice in the aerospace industry for fasteners and structural components. Its unique structure provides increased toughness and better corrosion resistance than its predecessor, 17-4 PH. Both inclusion control and a minimized amount of delta ferrite as compared to 17-4 stainless steel contribute to the greater toughness of 15-5. The alloy is further strengthened by a low temperature heat treatment which precipitates a copper containing phase in the alloy. 15-5 PH is able to meet the stringent mechanical properties required in the aerospace and nuclear industries.
| Condition | A | H900 | H 1075 | H1150 |
| Density g/cm (3) | 7.75 | 7.81 | 7.83 | 7.86 |
| Density lb/in (3) | 0.280 | 0.282 | 0.283 | 0.284 |
| Thermal Conductivity 70-212° | 10.6 | 10.3 | ||
| Thermal Conductivity 70-932° | 13.1 | 13.1 | ||
| Electrical Resistivity | 98 | 77 | 80 | 86 |
| Condition | Ultimate Tensile Strenght | Yield Strength | Elongation | Reduction of Area | Hardness Brinell | Hardness Rockwell |
| H900 | 190,000 | 170,000 | 6 | 15 | 388 | C40 |
| H1025 | 155,000 | 125,000 | 8 | 27 | 331 | C35 |
| H1075 | 145,000 | 125,000 | 9 | 28 | 311 | C32 |
| H1150 | 135,000 | 105,000 | 11 | 30 | 277 | C28 |
| H1150-M | 115,000 | 75,000 | 14 | 35 | 255 |