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ASTM A372 Grade M Steel vs. S32550 Stainless Steel

Both ASTM A372 grade M steel and S32550 stainless steel are iron alloys. They have 68% of their average alloy composition in common. There are 32 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 S32550 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240 to 280
260
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 18 to 21
21
Fatigue Strength, MPa 450 to 520
400
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 73
80
Shear Strength, MPa 510 to 570
540
Tensile Strength: Ultimate (UTS), MPa 810 to 910
860
Tensile Strength: Yield (Proof), MPa 660 to 770
620

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 450
1100
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 46
16
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
20
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.0
3.8
Embodied Energy, MJ/kg 27
53
Embodied Water, L/kg 61
180

Common Calculations

PREN (Pitting Resistance) 3.4
40
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
160
Resilience: Unit (Modulus of Resilience), kJ/m3 1140 to 1580
940
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 29 to 32
31
Strength to Weight: Bending, points 24 to 27
26
Thermal Diffusivity, mm2/s 12
4.4
Thermal Shock Resistance, points 24 to 27
23

Alloy Composition

Carbon (C), % 0 to 0.23
0 to 0.040
Chromium (Cr), % 1.5 to 2.0
24 to 27
Copper (Cu), % 0
1.5 to 2.5
Iron (Fe), % 92.5 to 95.1
57.2 to 67
Manganese (Mn), % 0.2 to 0.4
0 to 1.5
Molybdenum (Mo), % 0.4 to 0.6
2.9 to 3.9
Nickel (Ni), % 2.8 to 3.9
4.5 to 6.5
Nitrogen (N), % 0
0.1 to 0.25
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 0.030
Vanadium (V), % 0 to 0.080
0