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UNS S13800 (PH 13-8 Mo, XM-13) Stainless Steel

S13800 stainless steel is a precipitation-hardening stainless steel formulated for primary forming into wrought products. XM-13 is the ASTM designation for this material. S13800 is the UNS number. And PH 13-8 Mo is the common industry name.

The properties of S13800 stainless steel include seven common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare S13800 stainless steel to: wrought precipitation-hardening stainless steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Brinell Hardness

290 to 480

Elastic (Young's, Tensile) Modulus

200 GPa 28 x 106 psi

Elongation at Break

11 to 18 %

Fatigue Strength

410 to 870 MPa 59 to 130 x 103 psi

Poisson's Ratio


Reduction in Area

39 to 62 %

Rockwell C Hardness

30 to 51

Shear Modulus

77 GPa 11 x 106 psi

Shear Strength

610 to 1030 MPa 88 to 150 x 103 psi

Tensile Strength: Ultimate (UTS)

980 to 1730 MPa 140 to 250 x 103 psi

Tensile Strength: Yield (Proof)

660 to 1580 MPa 95 to 230 x 103 psi

Thermal Properties

Latent Heat of Fusion

280 J/g

Maximum Temperature: Corrosion

390 °C 740 °F

Maximum Temperature: Mechanical

810 °C 1490 °F

Melting Completion (Liquidus)

1450 °C 2650 °F

Melting Onset (Solidus)

1410 °C 2570 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

16 W/m-K 9.3 BTU/h-ft-°F

Thermal Expansion

11 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.3 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.6 % IACS

Otherwise Unclassified Properties

Base Metal Price

15 % relative


7.9 g/cm3 490 lb/ft3

Embodied Carbon

3.4 kg CO2/kg material

Embodied Energy

46 MJ/kg 20 x 103 BTU/lb

Embodied Water

140 L/kg 16 gal/lb

Common Calculations

PREN (Pitting Resistance)


Resilience: Ultimate (Unit Rupture Work)

150 to 190 MJ/m3

Resilience: Unit (Modulus of Resilience)

1090 to 5490 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

35 to 61 points

Strength to Weight: Bending

28 to 41 points

Thermal Diffusivity

4.3 mm2/s

Thermal Shock Resistance

33 to 58 points

Alloy Composition

Among wrought stainless steels, the composition of S13800 stainless steel is notable for including aluminum (Al). Aluminum is used to improve oxidation resistance. It can also enhance the effects of heat treatment.

Iron (Fe)Fe 73.6 to 77.3
Chromium (Cr)Cr 12.3 to 13.2
Nickel (Ni)Ni 7.5 to 8.5
Molybdenum (Mo)Mo 2.0 to 3.0
Aluminum (Al)Al 0.9 to 1.4
Manganese (Mn)Mn 0 to 0.2
Silicon (Si)Si 0 to 0.1
Carbon (C)C 0 to 0.050
Phosphorus (P)P 0 to 0.010
Nitrogen (N)N 0 to 0.010
Sulfur (S)S 0 to 0.0080

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM A564: Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes

ASTM A959: Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels

Corrosion of Stainless Steels, A. John Sedriks, 1996

ASM Specialty Handbook: Stainless Steels, J. R. Davis (editor), 1994

Advances in Stainless Steels, Baldev Raj et al. (editors), 2010