3/4-hard AISI 301 vs. Half-hard AISI 301
Both 3/4-hard AISI 301 and half-hard AISI 301 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 3/4-hard AISI 301 and the bottom bar is half-hard AISI 301.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 410 | |
| 350 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 13 | |
| 20 |
| Fatigue Strength, MPa | 600 | |
| 550 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 77 | |
| 77 |
| Shear Strength, MPa | 820 | |
| 730 |
| Tensile Strength: Ultimate (UTS), MPa | 1350 | |
| 1170 |
| Tensile Strength: Yield (Proof), MPa | 1060 | |
| 860 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 280 |
| Maximum Temperature: Corrosion, °C | 410 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 840 | |
| 840 |
| Melting Completion (Liquidus), °C | 1420 | |
| 1420 |
| Melting Onset (Solidus), °C | 1400 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 16 | |
| 16 |
| Thermal Expansion, µm/m-K | 17 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.4 | |
| 2.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.7 | |
| 2.7 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 13 | |
| 13 |
| Calomel Potential, mV | -70 | |
| -70 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 2.7 | |
| 2.7 |
| Embodied Energy, MJ/kg | 39 | |
| 39 |
| Embodied Water, L/kg | 130 | |
| 130 |
Common Calculations
| PREN (Pitting Resistance) | 18 | |
| 18 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 170 | |
| 220 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2860 | |
| 1880 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 48 | |
| 42 |
| Strength to Weight: Bending, points | 35 | |
| 32 |
| Thermal Diffusivity, mm2/s | 4.2 | |
| 4.2 |
| Thermal Shock Resistance, points | 29 | |
| 25 |
Alloy Composition
| Carbon (C), % | 0 to 0.15 | |
| 0 to 0.15 |
| Chromium (Cr), % | 16 to 18 | |
| 16 to 18 |
| Iron (Fe), % | 70.7 to 78 | |
| 70.7 to 78 |
| Manganese (Mn), % | 0 to 2.0 | |
| 0 to 2.0 |
| Nickel (Ni), % | 6.0 to 8.0 | |
| 6.0 to 8.0 |
| Nitrogen (N), % | 0 to 0.1 | |
| 0 to 0.1 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |