Quarter-hard AISI 202 vs. Quarter-hard AISI 204
Both quarter-hard AISI 202 and quarter-hard AISI 204 are iron alloys. Both are furnished in the quarter-hard temper. They have a moderately high 94% of their average alloy composition in common.
For each property being compared, the top bar is quarter-hard AISI 202 and the bottom bar is quarter-hard AISI 204.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 300 | |
| 330 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 14 | |
| 23 |
| Fatigue Strength, MPa | 330 | |
| 720 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 77 | |
| 77 |
| Shear Strength, MPa | 590 | |
| 700 |
| Tensile Strength: Ultimate (UTS), MPa | 980 | |
| 1100 |
| Tensile Strength: Yield (Proof), MPa | 580 | |
| 1080 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 280 |
| Maximum Temperature: Corrosion, °C | 410 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 910 | |
| 850 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1410 |
| Melting Onset (Solidus), °C | 1360 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 15 | |
| 15 |
| Thermal Expansion, µm/m-K | 17 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.4 | |
| 2.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.9 | |
| 2.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 13 | |
| 10 |
| Density, g/cm3 | 7.7 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 2.8 | |
| 2.4 |
| Embodied Energy, MJ/kg | 40 | |
| 35 |
| Embodied Water, L/kg | 150 | |
| 130 |
Common Calculations
| PREN (Pitting Resistance) | 20 | |
| 20 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
| 250 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 840 | |
| 2940 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 35 | |
| 40 |
| Strength to Weight: Bending, points | 29 | |
| 31 |
| Thermal Diffusivity, mm2/s | 4.0 | |
| 4.1 |
| Thermal Shock Resistance, points | 21 | |
| 24 |
Alloy Composition
| Carbon (C), % | 0 to 0.15 | |
| 0 to 0.030 |
| Chromium (Cr), % | 17 to 19 | |
| 15 to 17 |
| Iron (Fe), % | 63.5 to 71.5 | |
| 69.6 to 76.4 |
| Manganese (Mn), % | 7.5 to 10 | |
| 7.0 to 9.0 |
| Nickel (Ni), % | 4.0 to 6.0 | |
| 1.5 to 3.0 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0.15 to 0.3 |
| Phosphorus (P), % | 0 to 0.060 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |