AISI 431 Stainless Steel vs. S17700 Stainless Steel
Both AISI 431 stainless steel and S17700 stainless steel are iron alloys. They have a moderately high 93% of their average alloy composition in common.
For each property being compared, the top bar is AISI 431 stainless steel and the bottom bar is S17700 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 250 | |
| 180 to 430 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 15 to 17 | |
| 1.0 to 23 |
| Fatigue Strength, MPa | 430 to 610 | |
| 290 to 560 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Rockwell C Hardness | 26 | |
| 41 to 46 |
| Shear Modulus, GPa | 77 | |
| 76 |
| Shear Strength, MPa | 550 to 840 | |
| 740 to 940 |
| Tensile Strength: Ultimate (UTS), MPa | 890 to 1380 | |
| 1180 to 1650 |
| Tensile Strength: Yield (Proof), MPa | 710 to 1040 | |
| 430 to 1210 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 290 |
| Maximum Temperature: Corrosion, °C | 400 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 850 | |
| 890 |
| Melting Completion (Liquidus), °C | 1510 | |
| 1440 |
| Melting Onset (Solidus), °C | 1450 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 26 | |
| 15 |
| Thermal Expansion, µm/m-K | 12 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.6 | |
| 2.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 3.0 | |
| 2.7 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.0 | |
| 13 |
| Density, g/cm3 | 7.7 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 2.2 | |
| 2.8 |
| Embodied Energy, MJ/kg | 31 | |
| 40 |
| Embodied Water, L/kg | 120 | |
| 150 |
Common Calculations
| PREN (Pitting Resistance) | 16 | |
| 17 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 180 | |
| 15 to 210 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1270 to 2770 | |
| 460 to 3750 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 32 to 50 | |
| 42 to 59 |
| Strength to Weight: Bending, points | 27 to 36 | |
| 32 to 40 |
| Thermal Diffusivity, mm2/s | 7.0 | |
| 4.1 |
| Thermal Shock Resistance, points | 28 to 43 | |
| 39 to 54 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0.75 to 1.5 |
| Carbon (C), % | 0 to 0.2 | |
| 0 to 0.090 |
| Chromium (Cr), % | 15 to 17 | |
| 16 to 18 |
| Iron (Fe), % | 78.2 to 83.8 | |
| 70.5 to 76.8 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 to 1.0 |
| Nickel (Ni), % | 1.3 to 2.5 | |
| 6.5 to 7.8 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |