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S31655 Stainless Steel vs. ASTM A372 Grade M Steel

Both S31655 stainless steel and ASTM A372 grade M steel are iron alloys. They have 74% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is S31655 stainless steel and the bottom bar is ASTM A372 grade M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
240 to 280
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 39
18 to 21
Fatigue Strength, MPa 300
450 to 520
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
73
Shear Strength, MPa 490
510 to 570
Tensile Strength: Ultimate (UTS), MPa 710
810 to 910
Tensile Strength: Yield (Proof), MPa 350
660 to 770

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 1010
450
Melting Completion (Liquidus), °C 1430
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
46
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 17
5.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.3
2.0
Embodied Energy, MJ/kg 46
27
Embodied Water, L/kg 160
61

Common Calculations

PREN (Pitting Resistance) 27
3.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
160
Resilience: Unit (Modulus of Resilience), kJ/m3 310
1140 to 1580
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25
29 to 32
Strength to Weight: Bending, points 23
24 to 27
Thermal Diffusivity, mm2/s 4.0
12
Thermal Shock Resistance, points 16
24 to 27

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.23
Chromium (Cr), % 19.5 to 21.5
1.5 to 2.0
Copper (Cu), % 0 to 1.0
0
Iron (Fe), % 63.2 to 71.9
92.5 to 95.1
Manganese (Mn), % 0 to 2.0
0.2 to 0.4
Molybdenum (Mo), % 0.5 to 1.5
0.4 to 0.6
Nickel (Ni), % 8.0 to 9.5
2.8 to 3.9
Nitrogen (N), % 0.14 to 0.25
0
Phosphorus (P), % 0 to 0.045
0 to 0.015
Silicon (Si), % 0 to 1.0
0 to 0.3
Sulfur (S), % 0 to 0.015
0 to 0.010
Vanadium (V), % 0
0 to 0.080