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