S31277 Stainless Steel vs. SAE-AISI S2 Steel

Both S31277 stainless steel and SAE-AISI S2 steel are iron alloys. They have 42% of their average alloy composition in common. There are 19 material properties with values for both materials. Properties with values for just one material (13, 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 S2 steel.

UNS S31277 (27-7Mo) Stainless Steel SAE-AISI S2 (T41902) Shock-Resisting Steel

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		210
Elastic (Young's, Tensile) Modulus, GPa		190

Poisson's Ratio		0.28
Poisson's Ratio		0.29

Shear Modulus, GPa		80
Shear Modulus, GPa		72

Tensile Strength: Ultimate (UTS), MPa		860
Tensile Strength: Ultimate (UTS), MPa		670 to 1940

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		1450

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

Specific Heat Capacity, J/kg-K		460
Specific Heat Capacity, J/kg-K		470

Thermal Expansion, µm/m-K		16
Thermal Expansion, µm/m-K		11

Otherwise Unclassified Properties

Base Metal Price, % relative		36
Base Metal Price, % relative		2.6

Density, g/cm³		8.1
Density, g/cm³		7.8

Embodied Carbon, kg CO₂/kg material		6.7
Embodied Carbon, kg CO₂/kg material		2.1

Embodied Energy, MJ/kg		90
Embodied Energy, MJ/kg		30

Embodied Water, L/kg		220
Embodied Water, L/kg		49

Common Calculations

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

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

Strength to Weight: Axial, points		29
Strength to Weight: Axial, points		24 to 69

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

Thermal Shock Resistance, points		19
Thermal Shock Resistance, points		23 to 68

Alloy Composition

Carbon (C), %		0 to 0.020
Carbon (C), %		0.4 to 0.55

Chromium (Cr), %		20.5 to 23
Chromium (Cr), %		0

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

Iron (Fe), %		35.5 to 46.2
Iron (Fe), %		96 to 98.1

Manganese (Mn), %		0 to 3.0
Manganese (Mn), %		0.3 to 0.5

Molybdenum (Mo), %		6.5 to 8.0
Molybdenum (Mo), %		0.3 to 0.6

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), %		0.9 to 1.2

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

Vanadium (V), %		0
Vanadium (V), %		0 to 0.5