Stainless Steel grade 13-8Mo (UNS S13800)

Topics Covered

Chemical Composition
Mechanical Properties
Other Designations


Stainless steel grade 13-8 Mo has a high toughness and excellent resistance to stress corrosion cracking. It has been designed to handle applications where high strength, corrosion resistance, toughness, and stress resistance are essential. This is a martensitic alloy.

The following sections will discuss in detail about stainless steel grade 13-8 Mo.

Chemical Composition

The chemical composition of stainless steel grade 13-8 Mo is outlined in the following table.

Element Content (%)
Chromium, Cr 12.25-13.25
Nickel, Ni 7.5-8.5
Molybdenum, Mo 2.0-2.5
Aluminum, Al 0.90-1.35
Manganese, Mn 0.10 max
Silicon, Si 0.10 max
Carbon, C 0.05 max
Nitrogen, N 0.01 max
Phosphorous, P 0.010 max
Sulfur, S 0.008 max
Iron, Fe Balance

Mechanical Properties

The mechanical properties of stainless steel sheet grade 13-8 Mo (H950-Temper) are tabulated below.

Properties Metric Imperial
Tensile strength 1516 MPa 220 ksi
Yield strength 1413 MPa 205 ksi
Elongation at break 10% 10%
Hardness, Rockwell C 45 45

Other Designations

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Other designations that are equivalent to stainless steel grade 13-8 Mo include the following.

  • ASTM A 564
  • AMS 5864
  • ASTM A 564
  • ASME SA693
  • ASTM A 705
  • ASME SA705
  • DIN 1.4534
  • AMS 5629 Type 1


Stainless steel grade 13-8 Mo is used in the following products:

  • Pins
  • Valves
  • Shafts
  • Screws and bolts
  • Missile components
  • Fittings and fasteners
  • Injection molding equipment
  • Nuclear and petrochemical industry equipment
  • Aircraft components such as engine, landing gear and structural sections

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