S17700 Stainless Steel vs. ASTM A387 Grade 91 Class 2
Both S17700 stainless steel and ASTM A387 grade 91 class 2 are iron alloys. They have 83% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.
For each property being compared, the top bar is S17700 stainless steel and the bottom bar is ASTM A387 grade 91 class 2.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 180 to 430 | |
| 200 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 1.0 to 23 | |
| 20 |
| Fatigue Strength, MPa | 290 to 560 | |
| 330 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 76 | |
| 75 |
| Shear Strength, MPa | 740 to 940 | |
| 420 |
| Tensile Strength: Ultimate (UTS), MPa | 1180 to 1650 | |
| 670 |
| Tensile Strength: Yield (Proof), MPa | 430 to 1210 | |
| 470 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 270 |
| Maximum Temperature: Mechanical, °C | 890 | |
| 600 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1460 |
| Melting Onset (Solidus), °C | 1400 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 470 |
| Thermal Conductivity, W/m-K | 15 | |
| 26 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.3 | |
| 8.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.7 | |
| 10 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 13 | |
| 7.0 |
| Density, g/cm3 | 7.7 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 2.8 | |
| 2.6 |
| Embodied Energy, MJ/kg | 40 | |
| 37 |
| Embodied Water, L/kg | 150 | |
| 88 |
Common Calculations
| PREN (Pitting Resistance) | 17 | |
| 13 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 15 to 210 | |
| 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 460 to 3750 | |
| 580 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 42 to 59 | |
| 24 |
| Strength to Weight: Bending, points | 32 to 40 | |
| 22 |
| Thermal Diffusivity, mm2/s | 4.1 | |
| 6.9 |
| Thermal Shock Resistance, points | 39 to 54 | |
| 19 |
Alloy Composition
| Aluminum (Al), % | 0.75 to 1.5 | |
| 0 to 0.020 |
| Carbon (C), % | 0 to 0.090 | |
| 0.080 to 0.12 |
| Chromium (Cr), % | 16 to 18 | |
| 8.0 to 9.5 |
| Iron (Fe), % | 70.5 to 76.8 | |
| 87.3 to 90.3 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 0 | |
| 0.85 to 1.1 |
| Nickel (Ni), % | 6.5 to 7.8 | |
| 0 to 0.4 |
| Niobium (Nb), % | 0 | |
| 0.060 to 0.1 |
| Nitrogen (N), % | 0 | |
| 0.030 to 0.070 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.020 |
| Silicon (Si), % | 0 to 1.0 | |
| 0.2 to 0.5 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.010 |
| Titanium (Ti), % | 0 | |
| 0 to 0.010 |
| Vanadium (V), % | 0 | |
| 0.18 to 0.25 |
| Zirconium (Zr), % | 0 | |
| 0 to 0.010 |