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SAE-AISI H12 Steel vs. SAE-AISI A9 Steel

Both SAE-AISI H12 steel and SAE-AISI A9 steel are iron alloys. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI H12 steel and the bottom bar is SAE-AISI A9 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 75
74
Tensile Strength: Ultimate (UTS), MPa 690 to 1850
770 to 2030

Thermal Properties

Latent Heat of Fusion, J/g 270
280
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
35
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.3
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 9.5
9.2

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
7.0
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.9
4.7
Embodied Energy, MJ/kg 41
70
Embodied Water, L/kg 76
82

Common Calculations

PREN (Pitting Resistance) 12
10
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 65
28 to 73
Strength to Weight: Bending, points 22 to 42
24 to 46
Thermal Diffusivity, mm2/s 9.8
9.6
Thermal Shock Resistance, points 22 to 60
25 to 66

Alloy Composition

Carbon (C), % 0.3 to 0.4
0.45 to 0.55
Chromium (Cr), % 4.8 to 5.5
4.8 to 5.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 87.8 to 91.7
87 to 90.5
Manganese (Mn), % 0.2 to 0.5
0 to 0.5
Molybdenum (Mo), % 1.3 to 1.8
1.3 to 1.8
Nickel (Ni), % 0 to 0.3
1.3 to 1.8
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.8 to 1.2
1.0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.0 to 1.7
0
Vanadium (V), % 0 to 0.5
0.8 to 1.4

Comparable Variants