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SAE-AISI M3 Class 2 Steel vs. ASTM A387 Grade 21 Steel

Both SAE-AISI M3 class 2 steel and ASTM A387 grade 21 steel are iron alloys. They have 84% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M3 class 2 steel and the bottom bar is ASTM A387 grade 21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 77
74
Tensile Strength: Ultimate (UTS), MPa 770 to 2210
500 to 590

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1620
1470
Melting Onset (Solidus), °C 1570
1430
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 26
41
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 25
4.1
Density, g/cm3 8.3
7.9
Embodied Carbon, kg CO2/kg material 12
1.8
Embodied Energy, MJ/kg 180
23
Embodied Water, L/kg 110
62

Common Calculations

PREN (Pitting Resistance) 33
6.4
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26 to 74
18 to 21
Strength to Weight: Bending, points 22 to 45
18 to 20
Thermal Diffusivity, mm2/s 7.2
11
Thermal Shock Resistance, points 24 to 69
14 to 17

Alloy Composition

Carbon (C), % 1.2 to 1.3
0.050 to 0.15
Chromium (Cr), % 3.8 to 4.5
2.8 to 3.3
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.8 to 82.3
94.4 to 96
Manganese (Mn), % 0.15 to 0.4
0.3 to 0.6
Molybdenum (Mo), % 4.8 to 6.5
0.9 to 1.1
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.2 to 0.45
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025
Tungsten (W), % 5.0 to 6.8
0
Vanadium (V), % 2.8 to 3.8
0

Comparable Variants