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SAE-AISI 4145 Steel vs. ASTM A387 Grade 12 Steel

Both SAE-AISI 4145 steel and ASTM A387 grade 12 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 (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4145 steel and the bottom bar is ASTM A387 grade 12 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
140 to 160
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
25
Fatigue Strength, MPa 240
190 to 230
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 360
300 to 330
Tensile Strength: Ultimate (UTS), MPa 580
470 to 520
Tensile Strength: Yield (Proof), MPa 360
260 to 310

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
430
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 42
44
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
2.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.6
Embodied Energy, MJ/kg 20
21
Embodied Water, L/kg 51
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
98 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 350
180 to 250
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21
16 to 18
Strength to Weight: Bending, points 20
17 to 18
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 17
14 to 15

Alloy Composition

Carbon (C), % 0.43 to 0.48
0.050 to 0.17
Chromium (Cr), % 0.8 to 1.1
0.8 to 1.2
Iron (Fe), % 96.7 to 97.7
97 to 98.2
Manganese (Mn), % 0.75 to 1.0
0.4 to 0.65
Molybdenum (Mo), % 0.15 to 0.25
0.45 to 0.6
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0.15 to 0.4
Sulfur (S), % 0 to 0.040
0 to 0.025