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Hardened SAE-AISI A9 vs. Hardened SAE-AISI H13

Both hardened SAE-AISI A9 and hardened SAE-AISI H13 are iron alloys. Both are furnished in the hardened (H) condition. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is hardened SAE-AISI A9 and the bottom bar is hardened SAE-AISI H13.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Rockwell C Hardness 63
56
Shear Modulus, GPa 74
74
Tensile Strength: Ultimate (UTS), MPa 2030
1820

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 35
29
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
8.3
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
9.7

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
6.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.7
4.3
Embodied Energy, MJ/kg 70
64
Embodied Water, L/kg 82
78

Common Calculations

PREN (Pitting Resistance) 10
9.9
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 73
65
Strength to Weight: Bending, points 46
43
Thermal Diffusivity, mm2/s 9.6
7.8
Thermal Shock Resistance, points 66
65

Alloy Composition

Carbon (C), % 0.45 to 0.55
0.32 to 0.45
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 to 90.5
88.8 to 92
Manganese (Mn), % 0 to 0.5
0.2 to 0.5
Molybdenum (Mo), % 1.3 to 1.8
1.1 to 1.8
Nickel (Ni), % 1.3 to 1.8
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 1.0 to 1.2
0.8 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0.8 to 1.4
0.8 to 1.2