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SAE-AISI H42 Steel vs. SAE-AISI A7 Steel

Both SAE-AISI H42 steel and SAE-AISI A7 steel are iron alloys. They have a moderately high 91% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI H42 steel and the bottom bar is SAE-AISI A7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 77
72
Tensile Strength: Ultimate (UTS), MPa 700 to 1980
800 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1620
1470
Melting Onset (Solidus), °C 1570
1430
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 24
37
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 24
10
Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.8
13
Embodied Energy, MJ/kg 130
200
Embodied Water, L/kg 98
100

Common Calculations

PREN (Pitting Resistance) 31
11
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 23 to 65
29 to 77
Strength to Weight: Bending, points 21 to 42
25 to 48
Thermal Diffusivity, mm2/s 6.5
10
Thermal Shock Resistance, points 20 to 57
27 to 72

Alloy Composition

Carbon (C), % 0.55 to 0.7
2.0 to 2.9
Chromium (Cr), % 3.8 to 4.5
5.0 to 5.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 79.3 to 83.8
81.4 to 87.7
Manganese (Mn), % 0.15 to 0.4
0 to 0.8
Molybdenum (Mo), % 4.5 to 5.5
0.9 to 1.4
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.5 to 6.8
0.5 to 1.5
Vanadium (V), % 1.8 to 2.2
3.9 to 5.2

Comparable Variants