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SAE-AISI M42 Steel vs. ASTM A387 Grade 21L Class 1

Both SAE-AISI M42 steel and ASTM A387 grade 21L class 1 are iron alloys. They have 83% 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 M42 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 78
74
Tensile Strength: Ultimate (UTS), MPa 810 to 2310
500

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Melting Completion (Liquidus), °C 1540
1470
Melting Onset (Solidus), °C 1490
1430
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 20
41
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 30
4.1
Density, g/cm3 8.2
7.9
Embodied Carbon, kg CO2/kg material 7.4
1.8
Embodied Energy, MJ/kg 100
23
Embodied Water, L/kg 140
62

Common Calculations

PREN (Pitting Resistance) 38
6.4
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 28 to 79
18
Strength to Weight: Bending, points 24 to 48
18
Thermal Diffusivity, mm2/s 5.4
11
Thermal Shock Resistance, points 25 to 71
14

Alloy Composition

Carbon (C), % 1.1 to 1.2
0 to 0.1
Chromium (Cr), % 3.5 to 4.3
2.8 to 3.3
Cobalt (Co), % 7.8 to 8.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.3 to 81
94.4 to 96.1
Manganese (Mn), % 0.15 to 0.4
0.3 to 0.6
Molybdenum (Mo), % 9.0 to 10
0.9 to 1.1
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.15 to 0.65
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025
Tungsten (W), % 1.2 to 1.9
0
Vanadium (V), % 1.0 to 1.4
0