General Information
Chemical Composition
Physical Properties
Mechanical Properties
General Information
Stainless Steel 15-5 is a precipitation hardening martensitic stainless steel designed to have a greater toughness than 17-4 ph stainless steel. It is used in applications requiring better corrosion resistance and transverse properties compared to other similar martensitic grades. Strength and toughness desired can be altered by temperate range in the heat treatment process.
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.
Common Trade Names
- 15-5 PH
- AK Steel 15-5 PH®
- ATI 15-5™
- ATI 15-5-MIL™
Common Applications of 15-5 PH
- Aerospace applications
- Fasteners
- Oil & Gas applications
- Power generation
- Valves, gears and pumps
- Food processing
Backed by Industry Standards
- UNS S15500
- AMS 5659
- ASTM A564
Chemical Composition
15-5 PH Chemical Composition
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
NbTa
Niobium plus Tantalum
0.15 – 0.45
Physical Properties
15-5 Physical Properties
Condition | A | H900 | H1075 | 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 |
Mechanical Properties
15-5 Mechanical Properties
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 | C32 |
H1075 | 145, 000 | 125, 000 | 9 | 28 | 311 | C32 |
H1150 | 135, 000 | 105, 000 | 11 | 30 | 277 | C28 |
H1150-M | 115, 000 | 5,000 | 14 | 35 | 255 |
- 15-5 PH Pipes
- 15-5 PH Fittings
- 15-5 PH Bars
- 15-5 PH Sheets & Plates
- 15-5 PH Coils & Strips
- 15-5 PH Wires

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