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SAE-AISI A4 Steel vs. SAE-AISI A7 Steel

Both SAE-AISI A4 steel and SAE-AISI A7 steel are iron alloys. They have 89% of their average alloy composition in common. There are 22 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 SAE-AISI A4 steel and the bottom bar is SAE-AISI A7 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 73
72
Tensile Strength: Ultimate (UTS), MPa 710 to 2050
800 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1410
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 40
37
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
10
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.8
13
Embodied Energy, MJ/kg 24
200
Embodied Water, L/kg 59
100

Common Calculations

PREN (Pitting Resistance) 5.3
11
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25 to 73
29 to 77
Strength to Weight: Bending, points 23 to 46
25 to 48
Thermal Diffusivity, mm2/s 11
10
Thermal Shock Resistance, points 23 to 67
27 to 72

Alloy Composition

Carbon (C), % 1.0 to 1.1
2.0 to 2.9
Chromium (Cr), % 0.9 to 2.2
5.0 to 5.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 92 to 95.5
81.4 to 87.7
Manganese (Mn), % 1.8 to 2.2
0 to 0.8
Molybdenum (Mo), % 0.9 to 1.4
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 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
0.5 to 1.5
Vanadium (V), % 0
3.9 to 5.2

Comparable Variants