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SAE-AISI S4 Steel vs. ASTM A387 Grade 9 Steel

Both SAE-AISI S4 steel and ASTM A387 grade 9 steel are iron alloys. They have a moderately high 90% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI S4 steel and the bottom bar is ASTM A387 grade 9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
75
Tensile Strength: Ultimate (UTS), MPa 670 to 2140
500 to 600

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Melting Completion (Liquidus), °C 1430
1460
Melting Onset (Solidus), °C 1390
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 44
26
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
10

Otherwise Unclassified Properties

Base Metal Price, % relative 2.2
6.5
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.0
2.1
Embodied Energy, MJ/kg 29
28
Embodied Water, L/kg 48
87

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24 to 77
18 to 21
Strength to Weight: Bending, points 22 to 48
18 to 20
Thermal Diffusivity, mm2/s 12
6.9
Thermal Shock Resistance, points 20 to 65
14 to 17

Alloy Composition

Carbon (C), % 0.5 to 0.65
0 to 0.15
Chromium (Cr), % 0.1 to 0.5
8.0 to 10
Iron (Fe), % 95.2 to 96.9
87.1 to 90.8
Manganese (Mn), % 0.6 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 1.8 to 2.3
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.025
Vanadium (V), % 0.15 to 0.35
0 to 0.040

Comparable Variants