S31277 Stainless Steel vs. SAE-AISI M2 Steel

Both S31277 stainless steel and SAE-AISI M2 steel are iron alloys. They have 51% of their average alloy composition in common. There are 20 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is S31277 stainless steel and the bottom bar is SAE-AISI M2 steel.

UNS S31277 (27-7Mo) Stainless Steel SAE-AISI M2 (T11302) Molybdenum High-Speed Steel

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		210
Elastic (Young's, Tensile) Modulus, GPa		200

Poisson's Ratio		0.28
Poisson's Ratio		0.29

Shear Modulus, GPa		80
Shear Modulus, GPa		77

Tensile Strength: Ultimate (UTS), MPa		860
Tensile Strength: Ultimate (UTS), MPa		760 to 2150

Thermal Properties

Latent Heat of Fusion, J/g		310
Latent Heat of Fusion, J/g		260

Melting Completion (Liquidus), °C		1460
Melting Completion (Liquidus), °C		1610

Melting Onset (Solidus), °C		1410
Melting Onset (Solidus), °C		1570

Specific Heat Capacity, J/kg-K		460
Specific Heat Capacity, J/kg-K		440

Thermal Expansion, µm/m-K		16
Thermal Expansion, µm/m-K		10

Otherwise Unclassified Properties

Base Metal Price, % relative		36
Base Metal Price, % relative		24

Density, g/cm³		8.1
Density, g/cm³		8.4

Embodied Carbon, kg CO₂/kg material		6.7
Embodied Carbon, kg CO₂/kg material		8.8

Embodied Energy, MJ/kg		90
Embodied Energy, MJ/kg		130

Embodied Water, L/kg		220
Embodied Water, L/kg		98

Common Calculations

PREN (Pitting Resistance)		51
PREN (Pitting Resistance)		31

Stiffness to Weight: Axial, points		14
Stiffness to Weight: Axial, points		13

Stiffness to Weight: Bending, points		24
Stiffness to Weight: Bending, points		23

Strength to Weight: Axial, points		29
Strength to Weight: Axial, points		25 to 71

Strength to Weight: Bending, points		25
Strength to Weight: Bending, points		22 to 44

Thermal Shock Resistance, points		19
Thermal Shock Resistance, points		27 to 76

Alloy Composition

Carbon (C), %		0 to 0.020
Carbon (C), %		0.78 to 1.1

Chromium (Cr), %		20.5 to 23
Chromium (Cr), %		3.8 to 4.5

Copper (Cu), %		0.5 to 1.5
Copper (Cu), %		0 to 0.25

Iron (Fe), %		35.5 to 46.2
Iron (Fe), %		78.5 to 83.4

Manganese (Mn), %		0 to 3.0
Manganese (Mn), %		0.15 to 0.4

Molybdenum (Mo), %		6.5 to 8.0
Molybdenum (Mo), %		4.5 to 5.5

Nickel (Ni), %		26 to 28
Nickel (Ni), %		0 to 0.3

Nitrogen (N), %		0.3 to 0.4
Nitrogen (N), %		0

Phosphorus (P), %		0 to 0.030
Phosphorus (P), %		0 to 0.030

Silicon (Si), %		0 to 0.5
Silicon (Si), %		0.2 to 0.45

Sulfur (S), %		0 to 0.010
Sulfur (S), %		0 to 0.030

Tungsten (W), %		0
Tungsten (W), %		5.5 to 6.8

Vanadium (V), %		0
Vanadium (V), %		1.8 to 2.2