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SAE-AISI M3 Class 1 Steel vs. ASTM A387 Grade 21L Class 1

Both SAE-AISI M3 class 1 steel and ASTM A387 grade 21L class 1 are iron alloys. They have 85% 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 1 steel and the bottom bar is ASTM A387 grade 21L class 1.

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 2150
500

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1610
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 10
1.8
Embodied Energy, MJ/kg 150
23
Embodied Water, L/kg 100
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 72
18
Strength to Weight: Bending, points 22 to 44
18
Thermal Diffusivity, mm2/s 7.2
11
Thermal Shock Resistance, points 24 to 67
14

Alloy Composition

Carbon (C), % 1.0 to 1.1
0 to 0.1
Chromium (Cr), % 3.8 to 4.5
2.8 to 3.3
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.9 to 82.9
94.4 to 96.1
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), % 2.3 to 2.8
0