ASTM A369 Grade FP21 vs. S17700 Stainless Steel
Both ASTM A369 grade FP21 and S17700 stainless steel are iron alloys. They have 77% 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 ASTM A369 grade FP21 and the bottom bar is S17700 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 140 | |
| 180 to 430 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 20 | |
| 1.0 to 23 |
| Fatigue Strength, MPa | 160 | |
| 290 to 560 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 74 | |
| 76 |
| Shear Strength, MPa | 300 | |
| 740 to 940 |
| Tensile Strength: Ultimate (UTS), MPa | 470 | |
| 1180 to 1650 |
| Tensile Strength: Yield (Proof), MPa | 240 | |
| 430 to 1210 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 470 | |
| 890 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1440 |
| Melting Onset (Solidus), °C | 1430 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 41 | |
| 15 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.7 | |
| 2.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 | |
| 2.7 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 4.0 | |
| 13 |
| Density, g/cm3 | 7.8 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 2.8 |
| Embodied Energy, MJ/kg | 23 | |
| 40 |
| Embodied Water, L/kg | 61 | |
| 150 |
Common Calculations
| PREN (Pitting Resistance) | 6.2 | |
| 17 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 80 | |
| 15 to 210 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 150 | |
| 460 to 3750 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 17 | |
| 42 to 59 |
| Strength to Weight: Bending, points | 17 | |
| 32 to 40 |
| Thermal Diffusivity, mm2/s | 11 | |
| 4.1 |
| Thermal Shock Resistance, points | 14 | |
| 39 to 54 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0.75 to 1.5 |
| Carbon (C), % | 0.050 to 0.15 | |
| 0 to 0.090 |
| Chromium (Cr), % | 2.7 to 3.4 | |
| 16 to 18 |
| Iron (Fe), % | 94.3 to 96.2 | |
| 70.5 to 76.8 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0.8 to 1.1 | |
| 0 |
| Nickel (Ni), % | 0 | |
| 6.5 to 7.8 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.5 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 to 0.030 |