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Hardened SAE-AISI A9 vs. Hardened SAE-AISI H42

Both hardened SAE-AISI A9 and hardened SAE-AISI H42 are iron alloys. Both are furnished in the hardened (H) condition. They have 89% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is hardened SAE-AISI A9 and the bottom bar is hardened SAE-AISI H42.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.29
Rockwell C Hardness 63
61
Shear Modulus, GPa 74
77
Tensile Strength: Ultimate (UTS), MPa 2030
1980

Thermal Properties

Latent Heat of Fusion, J/g 280
260
Melting Completion (Liquidus), °C 1460
1620
Melting Onset (Solidus), °C 1410
1570
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 35
24
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
24
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 4.7
8.8
Embodied Energy, MJ/kg 70
130
Embodied Water, L/kg 82
98

Common Calculations

PREN (Pitting Resistance) 10
31
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 73
65
Strength to Weight: Bending, points 46
42
Thermal Diffusivity, mm2/s 9.6
6.5
Thermal Shock Resistance, points 66
57

Alloy Composition

Carbon (C), % 0.45 to 0.55
0.55 to 0.7
Chromium (Cr), % 4.8 to 5.5
3.8 to 4.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 87 to 90.5
79.3 to 83.8
Manganese (Mn), % 0 to 0.5
0.15 to 0.4
Molybdenum (Mo), % 1.3 to 1.8
4.5 to 5.5
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
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
5.5 to 6.8
Vanadium (V), % 0.8 to 1.4
1.8 to 2.2