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SAE-AISI 4142 Steel vs. ASTM A299 Steel

Both SAE-AISI 4142 steel and ASTM A299 steel are iron alloys.

For each property being compared, the top bar is SAE-AISI 4142 steel and the bottom bar is ASTM A299 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
180 to 190
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
21 to 22
Fatigue Strength, MPa 250
230 to 250
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 370
370 to 390
Tensile Strength: Ultimate (UTS), MPa 590
590 to 620
Tensile Strength: Yield (Proof), MPa 370
330 to 360

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
400
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 44
51
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
1.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.4
Embodied Energy, MJ/kg 20
19
Embodied Water, L/kg 51
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
110
Resilience: Unit (Modulus of Resilience), kJ/m3 360
290 to 350
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21
21 to 22
Strength to Weight: Bending, points 20
20 to 21
Thermal Diffusivity, mm2/s 12
14
Thermal Shock Resistance, points 19
17 to 18