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ASTM A372 Grade M Steel vs. S40930 Stainless Steel

Both ASTM A372 grade M steel and S40930 stainless steel are iron alloys. They have 90% 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 ASTM A372 grade M steel and the bottom bar is S40930 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240 to 280
160
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 18 to 21
23
Fatigue Strength, MPa 450 to 520
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Shear Strength, MPa 510 to 570
270
Tensile Strength: Ultimate (UTS), MPa 810 to 910
430
Tensile Strength: Yield (Proof), MPa 660 to 770
190

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 450
710
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 46
25
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.0
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
8.5
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.0
2.3
Embodied Energy, MJ/kg 27
32
Embodied Water, L/kg 61
94

Common Calculations

PREN (Pitting Resistance) 3.4
11
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
80
Resilience: Unit (Modulus of Resilience), kJ/m3 1140 to 1580
94
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 29 to 32
16
Strength to Weight: Bending, points 24 to 27
16
Thermal Diffusivity, mm2/s 12
6.7
Thermal Shock Resistance, points 24 to 27
16

Alloy Composition

Carbon (C), % 0 to 0.23
0 to 0.030
Chromium (Cr), % 1.5 to 2.0
10.5 to 11.7
Iron (Fe), % 92.5 to 95.1
84.7 to 89.4
Manganese (Mn), % 0.2 to 0.4
0 to 1.0
Molybdenum (Mo), % 0.4 to 0.6
0
Nickel (Ni), % 2.8 to 3.9
0 to 0.5
Niobium (Nb), % 0
0.080 to 0.75
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 0.3
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.020
Titanium (Ti), % 0
0.050 to 0.2
Vanadium (V), % 0 to 0.080
0