ACI-ASTM CG8M Steel vs. EN 1.4581 Stainless Steel
Both ACI-ASTM CG8M steel and EN 1.4581 stainless steel are iron alloys. They have a very high 98% of their average alloy composition in common.
For each property being compared, the top bar is ACI-ASTM CG8M steel and the bottom bar is EN 1.4581 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 180 | |
| 150 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 45 | |
| 28 |
| Fatigue Strength, MPa | 280 | |
| 150 |
| Impact Strength: V-Notched Charpy, J | 110 | |
| 45 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 79 | |
| 78 |
| Tensile Strength: Ultimate (UTS), MPa | 550 | |
| 510 |
| Tensile Strength: Yield (Proof), MPa | 300 | |
| 210 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 300 |
| Maximum Temperature: Corrosion, °C | 420 | |
| 490 |
| Maximum Temperature: Mechanical, °C | 1020 | |
| 990 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1440 |
| Melting Onset (Solidus), °C | 1400 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 16 | |
| 15 |
| Thermal Expansion, µm/m-K | 16 | |
| 16 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.3 | |
| 2.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 20 | |
| 21 |
| Density, g/cm3 | 7.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 4.1 | |
| 4.2 |
| Embodied Energy, MJ/kg | 56 | |
| 59 |
| Embodied Water, L/kg | 160 | |
| 160 |
Common Calculations
| PREN (Pitting Resistance) | 31 | |
| 26 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 210 | |
| 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 220 | |
| 110 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 19 | |
| 18 |
| Strength to Weight: Bending, points | 19 | |
| 18 |
| Thermal Diffusivity, mm2/s | 4.3 | |
| 3.9 |
| Thermal Shock Resistance, points | 12 | |
| 12 |
Alloy Composition
| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.070 |
| Chromium (Cr), % | 18 to 21 | |
| 18 to 20 |
| Iron (Fe), % | 58.8 to 70 | |
| 61.4 to 71 |
| Manganese (Mn), % | 0 to 1.5 | |
| 0 to 1.5 |
| Molybdenum (Mo), % | 3.0 to 4.0 | |
| 2.0 to 2.5 |
| Nickel (Ni), % | 9.0 to 13 | |
| 9.0 to 12 |
| Niobium (Nb), % | 0 | |
| 0 to 1.0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.5 | |
| 0 to 1.5 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.030 |