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SAE-AISI S1 Steel vs. SAE-AISI A8 Steel

Both SAE-AISI S1 steel and SAE-AISI A8 steel are iron alloys. They have a moderately high 95% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI S1 steel and the bottom bar is SAE-AISI A8 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
74
Tensile Strength: Ultimate (UTS), MPa 690 to 1840
700 to 1920

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1500
1480
Melting Onset (Solidus), °C 1450
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 41
37
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.7
8.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
9.5

Otherwise Unclassified Properties

Base Metal Price, % relative 8.0
8.5
Density, g/cm3 8.0
7.9
Embodied Carbon, kg CO2/kg material 2.6
2.3
Embodied Energy, MJ/kg 37
31
Embodied Water, L/kg 56
73

Common Calculations

PREN (Pitting Resistance) 5.9
12
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 64
25 to 68
Strength to Weight: Bending, points 22 to 42
22 to 44
Thermal Diffusivity, mm2/s 11
9.9
Thermal Shock Resistance, points 21 to 56
22 to 62

Alloy Composition

Carbon (C), % 0.4 to 0.55
0.5 to 0.6
Chromium (Cr), % 1.0 to 1.8
4.8 to 5.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 91.6 to 96.7
88.5 to 91.9
Manganese (Mn), % 0.1 to 0.4
0 to 0.5
Molybdenum (Mo), % 0 to 0.5
1.2 to 1.7
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.15 to 1.2
0.75 to 1.1
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.5 to 3.0
1.0 to 1.5
Vanadium (V), % 0.15 to 0.3
0

Comparable Variants