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ASTM A387 Grade 21 Steel vs. SAE-AISI H12 Steel

Both ASTM A387 grade 21 steel and SAE-AISI H12 steel are iron alloys. They have a moderately high 95% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (8, 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 H12 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
75
Tensile Strength: Ultimate (UTS), MPa 500 to 590
690 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1470
1480
Melting Onset (Solidus), °C 1430
1440
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 41
36
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
8.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
9.5

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
9.0
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 1.8
2.9
Embodied Energy, MJ/kg 23
41
Embodied Water, L/kg 62
76

Common Calculations

PREN (Pitting Resistance) 6.4
12
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 21
24 to 65
Strength to Weight: Bending, points 18 to 20
22 to 42
Thermal Diffusivity, mm2/s 11
9.8
Thermal Shock Resistance, points 14 to 17
22 to 60

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.3 to 0.4
Chromium (Cr), % 2.8 to 3.3
4.8 to 5.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 94.4 to 96
87.8 to 91.7
Manganese (Mn), % 0.3 to 0.6
0.2 to 0.5
Molybdenum (Mo), % 0.9 to 1.1
1.3 to 1.8
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0 to 0.5
0.8 to 1.2
Sulfur (S), % 0 to 0.025
0 to 0.030
Tungsten (W), % 0
1.0 to 1.7
Vanadium (V), % 0
0 to 0.5

Comparable Variants