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ASTM A387 Grade 21 Steel vs. SAE-AISI M1 Steel

Both ASTM A387 grade 21 steel and SAE-AISI M1 steel are iron alloys. They have 88% 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 ASTM A387 grade 21 steel and the bottom bar is SAE-AISI M1 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
77
Tensile Strength: Ultimate (UTS), MPa 500 to 590
730 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1470
1560
Melting Onset (Solidus), °C 1430
1510
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 41
29
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
18
Density, g/cm3 7.9
8.1
Embodied Carbon, kg CO2/kg material 1.8
7.0
Embodied Energy, MJ/kg 23
99
Embodied Water, L/kg 62
98

Common Calculations

PREN (Pitting Resistance) 6.4
35
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 21
25 to 73
Strength to Weight: Bending, points 18 to 20
22 to 45
Thermal Diffusivity, mm2/s 11
8.0
Thermal Shock Resistance, points 14 to 17
23 to 66

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.78 to 0.88
Chromium (Cr), % 2.8 to 3.3
3.5 to 4.0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 94.4 to 96
81 to 84.8
Manganese (Mn), % 0.3 to 0.6
0.15 to 0.4
Molybdenum (Mo), % 0.9 to 1.1
8.2 to 9.2
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0 to 0.5
0.2 to 0.5
Sulfur (S), % 0 to 0.025
0 to 0.030
Tungsten (W), % 0
1.4 to 2.1
Vanadium (V), % 0
1.0 to 1.4

Comparable Variants