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SAE-AISI 4142 Steel vs. ASTM A387 Grade 9 Steel

Both SAE-AISI 4142 steel and ASTM A387 grade 9 steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. 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 SAE-AISI 4142 steel and the bottom bar is ASTM A387 grade 9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
20 to 21
Fatigue Strength, MPa 250
160 to 240
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Shear Strength, MPa 370
310 to 380
Tensile Strength: Ultimate (UTS), MPa 590
500 to 600
Tensile Strength: Yield (Proof), MPa 370
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 420
600
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 44
26
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
10

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
6.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
2.1
Embodied Energy, MJ/kg 20
28
Embodied Water, L/kg 51
87

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
83 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 360
140 to 310
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21
18 to 21
Strength to Weight: Bending, points 20
18 to 20
Thermal Diffusivity, mm2/s 12
6.9
Thermal Shock Resistance, points 19
14 to 17

Alloy Composition

Carbon (C), % 0.4 to 0.45
0 to 0.15
Chromium (Cr), % 0.8 to 1.1
8.0 to 10
Iron (Fe), % 96.8 to 97.8
87.1 to 90.8
Manganese (Mn), % 0.75 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 0.15 to 0.25
0.9 to 1.1
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.025
Vanadium (V), % 0
0 to 0.040