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SAE-AISI 8740 Steel vs. SAE-AISI 1137 Steel

Both SAE-AISI 8740 steel and SAE-AISI 1137 steel are iron alloys. They have a very high 98% 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 8740 steel and the bottom bar is SAE-AISI 1137 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 200
200 to 210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 23
11 to 17
Fatigue Strength, MPa 270 to 350
250 to 400
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 370 to 400
430 to 460
Tensile Strength: Ultimate (UTS), MPa 580 to 670
700 to 760
Tensile Strength: Yield (Proof), MPa 380 to 570
370 to 650

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
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 39
51
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
10
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
12

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
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 50
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
81 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 390 to 850
360 to 1130
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20 to 24
25 to 27
Strength to Weight: Bending, points 20 to 22
22 to 24
Thermal Diffusivity, mm2/s 10
14
Thermal Shock Resistance, points 17 to 20
21 to 23

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.32 to 0.39
Chromium (Cr), % 0.4 to 0.6
0
Iron (Fe), % 96.5 to 97.7
97.8 to 98.3
Manganese (Mn), % 0.75 to 1.0
1.4 to 1.7
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 0.4 to 0.7
0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.040
0.080 to 0.13

Comparable Variants