UNS S15500 | EN 1.4545 | BSS7055 Rev A | AMS 5862 | STD 2154 | BMS 7-240 | ASTM A 564
Introduction
The 15-5 PH alloy was designed to have greater toughness than 17-4 PH. The 15-5 PH alloy is martensitic in structure in the annealed condition and is further strengthened by a relatively low temperature heat treatment which precipitates a copper containing phase in the alloy. 15-5 PH is also referred to as XM-12 in some specifications.
Stainless steel 15 – 5 PH, also known as XM-12 or UNS S15500, is a modification of 17-4 PH developed in the 1960s. It has a more refined microstructure obtained through the remelting process. This refined structure improves toughness of the material. UNS S15500 also has low temperature hardening, good fabrication properties and excellent corrosion resistance, which makes it suitable for many industries. It can be machined in the solution-annealed state or in final heat treat condition. The strength and ductility of UNS S15500 can be enhanced through heating the material at different temperatures.
UNS S15500 is a martensitic precipitation hardening type stainless steel. Martensitic stainless steels were designed to be corrosion resistant and hardened through heat treatment.
Chemistry
| Ni | Cr | Mn | Cu | Si | Cb+Ta | C | P | S | Fe | |
|---|---|---|---|---|---|---|---|---|---|---|
| MIN | 3.5 | 14.0 | – | 2.5 | – | 0.15 | – | – | – | – |
| MAX | 5.5 | 15.5 | 1.0 | 4.5 | 1.0 | 0.45 | 0.07 | 0.04 | 0.03 | Balance |
Chemical Composition
The chemical composition of Grade 15-5 PH stainless steel is outlined in the following table.
| Element | Content (%) |
|---|---|
| Iron, Fe | 75 |
| Chromium, Cr | 14.48 |
| Nickel, Ni | 4.5 |
| Copper, Cu | 3.5 |
| Manganese, Mn | ≤1 |
| Silicon, Si | ≤1 |
| Nb + Ta | 0.3 |
| Carbon, C | ≤0.07 |
| Phosphorous, P | ≤0.04 |
| Sulfur, S | ≤0.03 |
Inventory
- 15-5 PH Plate, 15-5 PH Rectangular Bar, 15-5 PH Round Bar
Common Trade Names
- 15-5 Stainless, 15-5 PH
Features
- Precipitation Hardening
- High Strength
- Moderate corrosion resistance to 600°F
Applications
- Aerospace applications
- Chemical and petrochemical applications
- Pulp and paper
- Food processing
- Marine gas turbine compressor sections
- Hallow shafts
- Paper mill equipment
- Engine parts
- Aircraft components
- Gears
- Fittings and fasteners
- Nuclear reactor components
Physical Properties
- Density: 0.280 lb/inch3
- Poisson’s Ratio: 0.272
- Electrical Resistivity: 589 Ohm-circ mil/ft
| Temperature, °F | 70 | 200 | 800 |
| Coefficient of Thermal Expansion, in/in°F x 10-6 | – | – | 6.3 |
| Thermal Conductivity Btu • ft/ft2 • hr • °F |
– | 10.6 | – |
| Modulus of Elasticity, psi X 106 |
28.5 | – | – |
70°F to indicated temperature.
Mechanical Properties
Minimum Specified Properties, ASTM A 564
| Condition | H 900 | H 1075 | H 1150 | A |
| 0.2 Offset Yield Strength, ksi | 170 | 125 | 105 | – |
| Ultimate Tensile Strength, ksi | 190 | 145 | 135 | – |
| Elongation % in 2″ minimum | 10 | 13 | 16 | – |
| Reduction of Area, % | 35 | 45 | 50 | – |
| Hardness, Brinell | 388 | 331 | 277 | 363 (MAX) |
Specifications
BSS7055 Rev A
STD 2154
UNS S15500
W. Nr./EN 1.4545AMS 5659, AMS 5862, AMS 5862J Type 2
ASME SA 564, ASME SA 693, ASME SA 705
ASTM A 564, ASTM A 693, ASTM A 698, ASTM A 705
ASTM-A564 (XM-12), BAC 5439 Rev H Class A Type1, BMS 7-240 (Boeing)
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