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 |