SAE-AISI 8740 Steel vs. S44625 Stainless Steel
Both SAE-AISI 8740 steel and S44625 stainless steel are iron alloys. They have 73% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 8740 steel and the bottom bar is S44625 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
200 |
Elongation at Break, % | 11 to 23 | |
22 |
Fatigue Strength, MPa | 270 to 350 | |
240 |
Poisson's Ratio | 0.29 | |
0.27 |
Shear Modulus, GPa | 73 | |
80 |
Shear Strength, MPa | 370 to 400 | |
370 |
Tensile Strength: Ultimate (UTS), MPa | 580 to 670 | |
590 |
Tensile Strength: Yield (Proof), MPa | 380 to 570 | |
360 |
Thermal Properties
Latent Heat of Fusion, J/g | 250 | |
290 |
Maximum Temperature: Mechanical, °C | 410 | |
1100 |
Melting Completion (Liquidus), °C | 1460 | |
1440 |
Melting Onset (Solidus), °C | 1420 | |
1400 |
Specific Heat Capacity, J/kg-K | 470 | |
480 |
Thermal Conductivity, W/m-K | 39 | |
17 |
Thermal Expansion, µm/m-K | 13 | |
11 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
2.2 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
2.6 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 2.6 | |
14 |
Density, g/cm3 | 7.8 | |
7.7 |
Embodied Carbon, kg CO2/kg material | 1.5 | |
2.8 |
Embodied Energy, MJ/kg | 20 | |
39 |
Embodied Water, L/kg | 50 | |
160 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 71 to 120 | |
110 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 390 to 850 | |
310 |
Stiffness to Weight: Axial, points | 13 | |
15 |
Stiffness to Weight: Bending, points | 24 | |
25 |
Strength to Weight: Axial, points | 20 to 24 | |
21 |
Strength to Weight: Bending, points | 20 to 22 | |
20 |
Thermal Diffusivity, mm2/s | 10 | |
4.6 |
Thermal Shock Resistance, points | 17 to 20 | |
19 |
Alloy Composition
Carbon (C), % | 0.38 to 0.43 | |
0 to 0.010 |
Chromium (Cr), % | 0.4 to 0.6 | |
25 to 27.5 |
Copper (Cu), % | 0 | |
0 to 0.2 |
Iron (Fe), % | 96.5 to 97.7 | |
69.4 to 74.3 |
Manganese (Mn), % | 0.75 to 1.0 | |
0 to 0.4 |
Molybdenum (Mo), % | 0.2 to 0.3 | |
0.75 to 1.5 |
Nickel (Ni), % | 0.4 to 0.7 | |
0 to 0.5 |
Nitrogen (N), % | 0 | |
0 to 0.015 |
Phosphorus (P), % | 0 to 0.035 | |
0 to 0.020 |
Silicon (Si), % | 0.15 to 0.35 | |
0 to 0.4 |
Sulfur (S), % | 0 to 0.040 | |
0 to 0.020 |