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ASTM A372 Grade M Steel vs. S31266 Stainless Steel

Both ASTM A372 grade M steel and S31266 stainless steel are iron alloys. They have 46% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ASTM A372 grade M steel and the bottom bar is S31266 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 18 to 21
40
Fatigue Strength, MPa 450 to 520
400
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
81
Shear Strength, MPa 510 to 570
590
Tensile Strength: Ultimate (UTS), MPa 810 to 910
860
Tensile Strength: Yield (Proof), MPa 660 to 770
470

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 450
1100
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
460
Thermal Conductivity, W/m-K 46
12
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.0
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
37
Density, g/cm3 7.9
8.2
Embodied Carbon, kg CO2/kg material 2.0
6.5
Embodied Energy, MJ/kg 27
89
Embodied Water, L/kg 61
220

Common Calculations

PREN (Pitting Resistance) 3.4
54
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
290
Resilience: Unit (Modulus of Resilience), kJ/m3 1140 to 1580
540
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29 to 32
29
Strength to Weight: Bending, points 24 to 27
24
Thermal Diffusivity, mm2/s 12
3.1
Thermal Shock Resistance, points 24 to 27
18

Alloy Composition

Carbon (C), % 0 to 0.23
0 to 0.030
Chromium (Cr), % 1.5 to 2.0
23 to 25
Copper (Cu), % 0
1.0 to 2.5
Iron (Fe), % 92.5 to 95.1
34.1 to 46
Manganese (Mn), % 0.2 to 0.4
2.0 to 4.0
Molybdenum (Mo), % 0.4 to 0.6
5.2 to 6.2
Nickel (Ni), % 2.8 to 3.9
21 to 24
Nitrogen (N), % 0
0.35 to 0.6
Phosphorus (P), % 0 to 0.015
0 to 0.035
Silicon (Si), % 0 to 0.3
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.020
Tungsten (W), % 0
1.5 to 2.5
Vanadium (V), % 0 to 0.080
0