15-5PH AMS 5659

15-5 PH stainless steel is a martensitic precipitation-hardening stainless steel which maintains a high strength to approximately 600 °F.  Compared to 17-4 PH, it offers better transverse toughness and ductility: better mechanical properties in larger cross-sections, and better forgeability.

Stock sizes: .500” to 8” diameters.

Common Specifications:

  • AMS 5659 TYPE 1
  • Pratt & Whitney LCS F-17
  • General Electric S-400 / S-SPEC-35
  • ASTM-A484
  • ASTM-A564; CAP. OF H900
  • ASME-SA564; CAP. OF H900

Common Applications:

  • Aerospace structural components
  • Shafts and gears
  • Fasteners
  • Valves

Industry Trade Names:

  • XM-12
  • 15-Cr-5Ni
  • UNS S15500

Macrostructure Limits:

Class Condition Severity
1 Freckles A
2 White Spots A
3 Radial Segregation A
4 Ring Pattern B

As solution treated the tensile strength shall not exceed 175 ksi and hardness shall not exceed 363 HB.

Rockwell-Industries-15-5PH-Stainless-Steel-AMS-5659-image

Composition

Element Min. Max.
Carbon 0.07
Manganese 1.00
Silicon 1.00
Phosphorus 0.030
Sulfur 0.015
Chromium 14.00 15.50
Nickel 3.50 5.50
Molybdenum 0.50
Copper 2.50 4.50
Columbium (Niobium) 5xC 0.45

Bars shall be solution heat treated in accordance with AMS-H-6875 by heating to 1900 °F ± 25 °F, holding at heat for a time commensurate with section thickness, heating equipment, and procedure used, and cooling as required to below 90 °F.

AMS 5659 Type 1 = VAR melting process
AMS 5659 Type 2 = ESR melting process

The precipitation heat treat requirements are as follows:

Condition Temperature Time
H900 900 °F ± 10 °F (482 °C ± 6°C) 1 hour + 15/-0 minutes
H925 925 °F ± 10 °F (496 °C ± 6°C) 4 hours + 30/-0 minutes
H1025 1025 °F ± 10 °F (552 °C ± 6°C) 4 hours + 30/-0 minutes
H1075 1075 °F ± 10 °F (579 °C ± 6°C) 4 hours + 30/-0 minutes
H1100 1100 °F ± 10 °F (593 °C ± 6°C) 4 hours + 30/-0 minutes
H1150 1150 °F ± 10 °F (621 °C ± 6°C) 4 hours + 30/-0 minutes

Minimum tensile properties in precipitation heat treated conditions:

Minimum tensile strength properties, inch/pound units

Condition Specimen Orientation Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 2 inches or 4D % Reduction of Area %
H900 Longitudinal
Transverse
190
190
170
170
10
6
35
20
H925 Longitudinal
Transverse
170
170
155
155
10
7
38
25
H1025 Longitudinal
Transverse
155
155
145
145
12
8
45
32
H1075 Longitudinal
Transverse
145
145
125
125
13
9
45
33
H1100 Longitudinal
Transverse
140
140
115
115
14
10
45
34
H1150 Longitudinal
Transverse
135
135
105
105
16
11
50
35