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ASTM A387 Grade 12 Steel vs. SAE-AISI 5140 Steel

Both ASTM A387 grade 12 steel and SAE-AISI 5140 steel are iron alloys. Their average alloy composition is basically identical. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 12 steel and the bottom bar is SAE-AISI 5140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140 to 160
170 to 290
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 25
12 to 29
Fatigue Strength, MPa 190 to 230
220 to 570
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 300 to 330
360 to 600
Tensile Strength: Ultimate (UTS), MPa 470 to 520
560 to 970
Tensile Strength: Yield (Proof), MPa 260 to 310
290 to 840

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 430
420
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 44
45
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
2.1
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.6
1.4
Embodied Energy, MJ/kg 21
19
Embodied Water, L/kg 51
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 98 to 110
76 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 250
220 to 1880
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 16 to 18
20 to 34
Strength to Weight: Bending, points 17 to 18
19 to 28
Thermal Diffusivity, mm2/s 12
12
Thermal Shock Resistance, points 14 to 15
16 to 29

Alloy Composition

Carbon (C), % 0.050 to 0.17
0.38 to 0.43
Chromium (Cr), % 0.8 to 1.2
0.7 to 0.9
Iron (Fe), % 97 to 98.2
97.3 to 98.1
Manganese (Mn), % 0.4 to 0.65
0.7 to 0.9
Molybdenum (Mo), % 0.45 to 0.6
0
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0.15 to 0.4
0.15 to 0.35
Sulfur (S), % 0 to 0.025
0 to 0.040

Comparable Variants