SAE-AISI 8630 Steel vs. SAE-AISI 5155 Steel
Both SAE-AISI 8630 steel and SAE-AISI 5155 steel are iron alloys. Their average alloy composition is basically identical.
For each property being compared, the top bar is SAE-AISI 8630 steel and the bottom bar is SAE-AISI 5155 steel.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 160 to 200 | |
190 |
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
190 |
Elongation at Break, % | 12 to 24 | |
21 |
Fatigue Strength, MPa | 260 to 350 | |
260 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 73 | |
73 |
Shear Strength, MPa | 340 to 410 | |
390 |
Tensile Strength: Ultimate (UTS), MPa | 540 to 680 | |
620 |
Tensile Strength: Yield (Proof), MPa | 360 to 560 | |
380 |
Thermal Properties
Latent Heat of Fusion, J/g | 250 | |
250 |
Maximum Temperature: Mechanical, °C | 410 | |
420 |
Melting Completion (Liquidus), °C | 1460 | |
1450 |
Melting Onset (Solidus), °C | 1420 | |
1410 |
Specific Heat Capacity, J/kg-K | 470 | |
470 |
Thermal Conductivity, W/m-K | 39 | |
49 |
Thermal Expansion, µm/m-K | 11 | |
12 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
7.2 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
8.3 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 2.6 | |
2.1 |
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 | |
49 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 78 to 110 | |
110 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 340 to 840 | |
380 |
Stiffness to Weight: Axial, points | 13 | |
13 |
Stiffness to Weight: Bending, points | 24 | |
24 |
Strength to Weight: Axial, points | 19 to 24 | |
22 |
Strength to Weight: Bending, points | 19 to 22 | |
21 |
Thermal Diffusivity, mm2/s | 10 | |
13 |
Thermal Shock Resistance, points | 18 to 23 | |
20 |
Alloy Composition
Carbon (C), % | 0.28 to 0.33 | |
0.51 to 0.59 |
Chromium (Cr), % | 0.4 to 0.6 | |
0.7 to 0.9 |
Iron (Fe), % | 96.8 to 97.9 | |
97.2 to 97.9 |
Manganese (Mn), % | 0.7 to 0.9 | |
0.7 to 0.9 |
Molybdenum (Mo), % | 0.15 to 0.25 | |
0 |
Nickel (Ni), % | 0.4 to 0.7 | |
0 |
Phosphorus (P), % | 0 to 0.035 | |
0 to 0.035 |
Silicon (Si), % | 0.15 to 0.35 | |
0.15 to 0.35 |
Sulfur (S), % | 0 to 0.040 | |
0 to 0.040 |