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SAE-AISI 1108 Steel vs. ASTM A372 Grade K Steel

Both SAE-AISI 1108 steel and ASTM A372 grade K steel are iron alloys. They have a very high 95% of their average alloy composition in common. There are 31 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 1108 steel and the bottom bar is ASTM A372 grade K steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 110 to 140
230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 23 to 34
23
Fatigue Strength, MPa 170 to 260
440
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 250 to 280
490
Tensile Strength: Ultimate (UTS), MPa 380 to 440
780
Tensile Strength: Yield (Proof), MPa 220 to 360
620

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
440
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 52
48
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.0
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
4.4
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 1.4
1.8
Embodied Energy, MJ/kg 18
24
Embodied Water, L/kg 46
57

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 95 to 110
160
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 340
1010
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 13 to 16
27
Strength to Weight: Bending, points 15 to 16
24
Thermal Diffusivity, mm2/s 14
13
Thermal Shock Resistance, points 12 to 14
23

Alloy Composition

Carbon (C), % 0.080 to 0.13
0 to 0.18
Chromium (Cr), % 0
1.0 to 1.8
Iron (Fe), % 98.9 to 99.24
93.4 to 96.6
Manganese (Mn), % 0.6 to 0.8
0.1 to 0.4
Molybdenum (Mo), % 0
0.2 to 0.6
Nickel (Ni), % 0
2.0 to 3.3
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0.080 to 0.13
0 to 0.010