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SAE-AISI 1040 Steel vs. SAE-AISI 1137 Steel

Both SAE-AISI 1040 steel and SAE-AISI 1137 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is SAE-AISI 1040 steel and the bottom bar is SAE-AISI 1137 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 180
200 to 210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 13 to 20
11 to 17
Fatigue Strength, MPa 220 to 340
250 to 400
Poisson's Ratio 0.29
0.29
Reduction in Area, % 40 to 45
34 to 39
Shear Modulus, GPa 73
73
Shear Strength, MPa 350 to 390
430 to 460
Tensile Strength: Ultimate (UTS), MPa 570 to 640
700 to 760
Tensile Strength: Yield (Proof), MPa 320 to 530
370 to 650

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
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
10
Electrical Conductivity: Equal Weight (Specific), % IACS 8.0
12

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
1.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.4
Embodied Energy, MJ/kg 18
19
Embodied Water, L/kg 46
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 96
81 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 270 to 760
360 to 1130
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20 to 23
25 to 27
Strength to Weight: Bending, points 19 to 21
22 to 24
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 18 to 20
21 to 23

Alloy Composition

Carbon (C), % 0.37 to 0.44
0.32 to 0.39
Iron (Fe), % 98.6 to 99.03
97.8 to 98.3
Manganese (Mn), % 0.6 to 0.9
1.4 to 1.7
Phosphorus (P), % 0 to 0.040
0 to 0.040
Sulfur (S), % 0 to 0.050
0.080 to 0.13

Comparable Variants