ASTM A227 Class I vs. ASTM A227 Class II
Both ASTM A227 class I and ASTM A227 class II are variants of the same material. They share alloy composition and many physical properties, but develop different mechanical properties as a result of different processing. There are 30 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 ASTM A227 class I and the bottom bar is ASTM A227 class II.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 500 | |
| 640 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 12 | |
| 12 |
| Fatigue Strength, MPa | 900 | |
| 1160 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 72 | |
| 72 |
| Shear Strength, MPa | 1030 | |
| 1330 |
| Tensile Strength: Ultimate (UTS), MPa | 1720 | |
| 2220 |
| Tensile Strength: Yield (Proof), MPa | 1430 | |
| 1850 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 400 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1450 |
| Melting Onset (Solidus), °C | 1410 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 52 | |
| 52 |
| Thermal Expansion, µm/m-K | 12 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 7.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 8.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.8 | |
| 1.8 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 1.4 |
| Embodied Energy, MJ/kg | 19 | |
| 19 |
| Embodied Water, L/kg | 46 | |
| 46 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 200 | |
| 260 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 61 | |
| 79 |
| Strength to Weight: Bending, points | 41 | |
| 48 |
| Thermal Diffusivity, mm2/s | 14 | |
| 14 |
| Thermal Shock Resistance, points | 55 | |
| 71 |
Alloy Composition
| Carbon (C), % | 0.45 to 0.85 | |
| 0.45 to 0.85 |
| Iron (Fe), % | 97.4 to 99.1 | |
| 97.4 to 99.1 |
| Manganese (Mn), % | 0.3 to 1.3 | |
| 0.3 to 1.3 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.050 | |
| 0 to 0.050 |