PH13-8Mo AMS 5629

13-8 is a precipitation-hardening martensitic stainless steel that has excellent strength, high hardness, superior toughness, and good corrosion resistance.  It is double vacuum melted in a VIM-VAR process.  13-8 PH steel provides a wide range of properties through a single precipitation hardening heat treatment. Its corrosion resistance is similar to 304 stainless, with greatest resistance in the fully hardened conditions.

Common stock sizes: .500” to 8” diameters.

Common Specifications:

  • AMS 5629
  • Pratt & Whitney LCS F-17
  • General Electric S-400 / S-SPEC-35
  • ASTM A564; CAPABLE OF H1000
  • ASTM F899 XM-13
  • HMS 6-1105 (EXCEPT SONIC)
  • DMS 2100 GRADE B
  • UNS S13800

Industry Trade Names:

  • PH13-8Mo
  • UNS S13800
  • XM-13

Common Applications:

  • Aerospace components
  • Components in the petrochemical and nuclear industries
  • Injection molding equipment

Macrostructure Limits:

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

Hardness of bars shall not exceed 363 HB.

Precipitation hardening parameters:

Condition Temperature
H950 950 °F ± 10 °F (510 °C ± 6°C)
H1000 1000 °F ± 10 °F (538 °C ± 6°C)
H1025 1025 °F ± 10 °F (552 °C ± 6°C)
H1050 1050 °F ± 10 °F (566 °C ± 6°C)
H1100 1100 °F ± 10 °F (593 °C ± 6°C)
H1150 1150 °F ± 10 °F (621 °C ± 6°C)
Rockwell-Industries-Intl-13-8-PH-Steel-AMS-5629-image

Composition

Element Min. Max.
Carbon -- 0.05
Manganese -- .10
Silicon -- 0.10
Phosphorus -- 0.010
Sulfur -- 0.008
Chromium 12.25 13.25
Nickel 7.50 8.50
Molybdenum 2.00 2.50
Aluminum 0.90 1.35
Nitrogen -- 0.010

Bars shall be solution heat treated by heating to 1700 °F ± 25 °F, holding at heat for a time commensurate with section thickness, heating equipment, and procedure used, and cooling to below 60 °F.

Average grain size for diameters up to 3” = ASTM No. 5 or finer
Average grain size for diameters over 3” = ASTM No. 4 or finer

Minimum tensile properties:

Minimum tensile properties after precipitation heat treatment, 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 %
H950 Longitudinal
Transverse
220
220
205
205
10
10
45
35
H1000 Longitudinal
Transverse
205
205
190
190
10
10
50
40
H1025 Longitudinal
Transverse
185
185
175
175
11
11
50
45
H1050 Longitudinal
Transverse
175
175
165
165
12
12
50
45
H1100 Longitudinal
Transverse
150
150
135
135
14
14
50
50
H1150 Longitudinal
Transverse
135
135
90
90
14
14
50
50