ASTM A202 Grade A vs. ASTM A202 Grade B
Both ASTM A202 grade A and ASTM A202 grade B 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.
For each property being compared, the top bar is ASTM A202 grade A and the bottom bar is ASTM A202 grade B.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 180 | |
| 200 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 18 | |
| 17 |
| Fatigue Strength, MPa | 240 | |
| 240 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Shear Strength, MPa | 360 | |
| 410 |
| Tensile Strength: Ultimate (UTS), MPa | 590 | |
| 670 |
| Tensile Strength: Yield (Proof), MPa | 350 | |
| 360 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 260 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 410 |
| 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 | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 7.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 8.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.1 | |
| 2.1 |
| 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 | 49 | |
| 49 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 93 | |
| 96 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 330 | |
| 350 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 21 | |
| 24 |
| Strength to Weight: Bending, points | 20 | |
| 22 |
| Thermal Diffusivity, mm2/s | 14 | |
| 14 |
| Thermal Shock Resistance, points | 17 | |
| 20 |
Alloy Composition
| Carbon (C), % | 0 to 0.17 | |
| 0 to 0.25 |
| Chromium (Cr), % | 0.31 to 0.64 | |
| 0.31 to 0.64 |
| Iron (Fe), % | 96.6 to 98.2 | |
| 96.6 to 98.2 |
| Manganese (Mn), % | 1.0 to 1.5 | |
| 1.0 to 1.5 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.035 |
| Silicon (Si), % | 0.54 to 1.0 | |
| 0.54 to 1.0 |
| Sulfur (S), % | 0 to 0.035 | |
| 0 to 0.035 |