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SAE-AISI M1 (T11301) Molybdenum High-Speed Steel

SAE-AISI M1 steel is a tool steel. M1 is the designation in both the SAE and AISI systems for this material. T11301 is the UNS number.

The properties of SAE-AISI M1 steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare SAE-AISI M1 steel to: tool 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

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Poisson's Ratio


Shear Modulus

77 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

730 to 2140 MPa 110 to 310 x 103 psi

Thermal Properties

Latent Heat of Fusion

270 J/g

Melting Completion (Liquidus)

1560 °C 2830 °F

Melting Onset (Solidus)

1510 °C 2750 °F

Specific Heat Capacity

450 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

29 W/m-K 17 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

18 % relative


8.1 g/cm3 510 lb/ft3

Embodied Carbon

7.0 kg CO2/kg material

Embodied Energy

99 MJ/kg 43 x 103 BTU/lb

Embodied Water

98 L/kg 12 gal/lb

Common Calculations

PREN (Pitting Resistance)


Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

25 to 73 points

Strength to Weight: Bending

22 to 45 points

Thermal Diffusivity

8.0 mm2/s

Thermal Shock Resistance

23 to 66 points

Alloy Composition

Iron (Fe)Fe 81 to 84.8
Molybdenum (Mo)Mo 8.2 to 9.2
Chromium (Cr)Cr 3.5 to 4.0
Tungsten (W)W 1.4 to 2.1
Vanadium (V)V 1.0 to 1.4
Carbon (C)C 0.78 to 0.88
Silicon (Si)Si 0.2 to 0.5
Manganese (Mn)Mn 0.15 to 0.4
Nickel (Ni)Ni 0 to 0.3
Copper (Cu)Cu 0 to 0.25
Phosphorus (P)P 0 to 0.030
Sulfur (S)S 0 to 0.030

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

Followup Questions

Similar Alloys

Further Reading

SAE J437: Selection and Heat Treatment of Tool and Die Steels

ASTM A600: Standard Specification for Tool Steel High Speed

Tool Steels, 5th ed., George Roberts et al., 1998

Tool Steels: Properties and Performance, Rafael A. Mesquita (editor), 2016

ASM Specialty Handbook: Carbon and Alloy Steels, J. R. Davis (editor), 1996

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015