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SAE-AISI M4 (T11304) Molybdenum High-Speed Steel

SAE-AISI M4 steel is a tool steel. M4 is the designation in both the SAE and AISI systems for this material. T11304 is the UNS number.

The properties of SAE-AISI M4 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 M4 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 28 x 106 psi

Poisson's Ratio

0.29

Shear Modulus

76 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

770 to 2150 MPa 110 to 310 x 103 psi

Thermal Properties

Latent Heat of Fusion

260 J/g

Melting Completion (Liquidus)

1610 °C 2930 °F

Melting Onset (Solidus)

1560 °C 2840 °F

Specific Heat Capacity

440 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

25 W/m-K 15 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

25 % relative

Density

8.3 g/cm3 520 lb/ft3

Embodied Carbon

14 kg CO2/kg material

Embodied Energy

210 MJ/kg 91 x 103 BTU/lb

Embodied Water

110 L/kg 13 gal/lb

Common Calculations

PREN (Pitting Resistance)

30

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

26 to 72 points

Strength to Weight: Bending

23 to 45 points

Thermal Diffusivity

6.9 mm2/s

Thermal Shock Resistance

24 to 68 points

Alloy Composition

Iron (Fe) 75.9 to 81.4
Tungsten (W) 5.3 to 6.5
Molybdenum (Mo) 4.3 to 5.5
Chromium (Cr) 3.8 to 4.8
Vanadium (V) 3.8 to 4.5
Carbon (C) 1.3 to 1.4
Silicon (Si) 0.2 to 0.45
Manganese (Mn) 0.15 to 0.4
Nickel (Ni) 0 to 0.3
Copper (Cu) 0 to 0.25
Phosphorus (P) 0 to 0.030
Sulfur (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

Sintering of Advanced Materials: Fundamentals and Processes, Zhigang Zak Fang (editor), 2010

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