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ASTM A387 Grade 12 Steel vs. SAE-AISI M42 Steel

Both ASTM A387 grade 12 steel and SAE-AISI M42 steel are iron alloys. They have 81% 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 12 steel and the bottom bar is SAE-AISI M42 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 73
78
Tensile Strength: Ultimate (UTS), MPa 470 to 520
810 to 2310

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Melting Completion (Liquidus), °C 1470
1540
Melting Onset (Solidus), °C 1420
1490
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 44
20
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
30
Density, g/cm3 7.8
8.2
Embodied Carbon, kg CO2/kg material 1.6
7.4
Embodied Energy, MJ/kg 21
100
Embodied Water, L/kg 51
140

Common Calculations

PREN (Pitting Resistance) 2.7
38
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 16 to 18
28 to 79
Strength to Weight: Bending, points 17 to 18
24 to 48
Thermal Diffusivity, mm2/s 12
5.4
Thermal Shock Resistance, points 14 to 15
25 to 71

Alloy Composition

Carbon (C), % 0.050 to 0.17
1.1 to 1.2
Chromium (Cr), % 0.8 to 1.2
3.5 to 4.3
Cobalt (Co), % 0
7.8 to 8.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 97 to 98.2
76.3 to 81
Manganese (Mn), % 0.4 to 0.65
0.15 to 0.4
Molybdenum (Mo), % 0.45 to 0.6
9.0 to 10
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0.15 to 0.4
0.15 to 0.65
Sulfur (S), % 0 to 0.025
0 to 0.030
Tungsten (W), % 0
1.2 to 1.9
Vanadium (V), % 0
1.0 to 1.4

Comparable Variants