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SAE-AISI H12 Steel vs. ASTM A387 Grade 9 Steel

Both SAE-AISI H12 steel and ASTM A387 grade 9 steel are iron alloys. They have a very high 96% 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 SAE-AISI H12 steel and the bottom bar is ASTM A387 grade 9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 75
75
Tensile Strength: Ultimate (UTS), MPa 690 to 1850
500 to 600

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Melting Completion (Liquidus), °C 1480
1460
Melting Onset (Solidus), °C 1440
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 36
26
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.3
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 9.5
10

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
6.5
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.9
2.1
Embodied Energy, MJ/kg 41
28
Embodied Water, L/kg 76
87

Common Calculations

PREN (Pitting Resistance) 12
12
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 65
18 to 21
Strength to Weight: Bending, points 22 to 42
18 to 20
Thermal Diffusivity, mm2/s 9.8
6.9
Thermal Shock Resistance, points 22 to 60
14 to 17

Alloy Composition

Carbon (C), % 0.3 to 0.4
0 to 0.15
Chromium (Cr), % 4.8 to 5.5
8.0 to 10
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87.8 to 91.7
87.1 to 90.8
Manganese (Mn), % 0.2 to 0.5
0.3 to 0.6
Molybdenum (Mo), % 1.3 to 1.8
0.9 to 1.1
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.8 to 1.2
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.025
Tungsten (W), % 1.0 to 1.7
0
Vanadium (V), % 0 to 0.5
0 to 0.040

Comparable Variants