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SAE-AISI 1140 Steel vs. ASTM A266 Carbon Steel

Both SAE-AISI 1140 steel and ASTM A266 carbon steel are iron alloys.

For each property being compared, the top bar is SAE-AISI 1140 steel and the bottom bar is ASTM A266 carbon steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 180
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 14 to 18
21 to 26
Fatigue Strength, MPa 230 to 370
170 to 200
Poisson's Ratio 0.29
0.29
Reduction in Area, % 39 to 46
34 to 43
Shear Modulus, GPa 72
73
Shear Strength, MPa 370 to 420
320 to 380
Tensile Strength: Ultimate (UTS), MPa 600 to 700
500 to 600
Tensile Strength: Yield (Proof), MPa 340 to 570
230 to 290

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
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 51
51 to 52
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
8.1 to 8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.4
Embodied Energy, MJ/kg 18
18 to 19
Embodied Water, L/kg 46
46 to 47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89 to 93
110
Resilience: Unit (Modulus of Resilience), kJ/m3 310 to 870
140 to 230
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21 to 25
18 to 21
Strength to Weight: Bending, points 20 to 22
18 to 20
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 18 to 21
16 to 19