EN 1.7720 Steel vs. AISI 321H Stainless Steel
Both EN 1.7720 steel and AISI 321H stainless steel are iron alloys. They have 71% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is EN 1.7720 steel and the bottom bar is AISI 321H stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 180 | |
| 190 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 19 | |
| 40 |
| Fatigue Strength, MPa | 230 | |
| 200 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 590 | |
| 580 |
| Tensile Strength: Yield (Proof), MPa | 340 | |
| 230 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 940 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1430 |
| Melting Onset (Solidus), °C | 1430 | |
| 1380 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 40 | |
| 15 |
| Thermal Expansion, µm/m-K | 13 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 2.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 2.7 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.8 | |
| 16 |
| Density, g/cm3 | 7.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 2.2 | |
| 3.2 |
| Embodied Energy, MJ/kg | 30 | |
| 46 |
| Embodied Water, L/kg | 51 | |
| 140 |
Common Calculations
| PREN (Pitting Resistance) | 2.1 | |
| 18 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 97 | |
| 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 300 | |
| 140 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 21 | |
| 21 |
| Strength to Weight: Bending, points | 20 | |
| 20 |
| Thermal Diffusivity, mm2/s | 11 | |
| 4.0 |
| Thermal Shock Resistance, points | 17 | |
| 12 |
Alloy Composition
| Carbon (C), % | 0.1 to 0.15 | |
| 0.040 to 0.1 |
| Chromium (Cr), % | 0.3 to 0.5 | |
| 17 to 19 |
| Copper (Cu), % | 0 to 0.3 | |
| 0 |
| Iron (Fe), % | 96.6 to 98.6 | |
| 65.4 to 74 |
| Manganese (Mn), % | 0.4 to 0.7 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 0.4 to 0.6 | |
| 0 |
| Nickel (Ni), % | 0 to 0.4 | |
| 9.0 to 12 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 0.45 | |
| 0 to 0.75 |
| Sulfur (S), % | 0 to 0.020 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 | |
| 0 to 0.7 |
| Vanadium (V), % | 0.22 to 0.3 | |
| 0 |