AISI 303 Stainless Steel vs. ASTM A387 Grade 9 Steel
Both AISI 303 stainless steel and ASTM A387 grade 9 steel are iron alloys. They have 81% 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 AISI 303 stainless steel and the bottom bar is ASTM A387 grade 9 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 170 to 210 | |
| 150 to 180 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 40 to 51 | |
| 20 to 21 |
| Fatigue Strength, MPa | 230 to 360 | |
| 160 to 240 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 77 | |
| 75 |
| Shear Strength, MPa | 430 to 470 | |
| 310 to 380 |
| Tensile Strength: Ultimate (UTS), MPa | 600 to 690 | |
| 500 to 600 |
| Tensile Strength: Yield (Proof), MPa | 230 to 420 | |
| 230 to 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 270 |
| Maximum Temperature: Mechanical, °C | 930 | |
| 600 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1460 |
| Melting Onset (Solidus), °C | 1400 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 470 |
| Thermal Conductivity, W/m-K | 16 | |
| 26 |
| Thermal Expansion, µm/m-K | 17 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.4 | |
| 9.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.8 | |
| 10 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 15 | |
| 6.5 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 3.0 | |
| 2.1 |
| Embodied Energy, MJ/kg | 42 | |
| 28 |
| Embodied Water, L/kg | 140 | |
| 87 |
Common Calculations
| PREN (Pitting Resistance) | 18 | |
| 12 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 240 | |
| 83 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 to 440 | |
| 140 to 310 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 21 to 25 | |
| 18 to 21 |
| Strength to Weight: Bending, points | 20 to 22 | |
| 18 to 20 |
| Thermal Diffusivity, mm2/s | 4.4 | |
| 6.9 |
| Thermal Shock Resistance, points | 13 to 15 | |
| 14 to 17 |
Alloy Composition
| Carbon (C), % | 0 to 0.15 | |
| 0 to 0.15 |
| Chromium (Cr), % | 17 to 19 | |
| 8.0 to 10 |
| Iron (Fe), % | 67.3 to 74.9 | |
| 87.1 to 90.8 |
| Manganese (Mn), % | 0 to 2.0 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 0 | |
| 0.9 to 1.1 |
| Nickel (Ni), % | 8.0 to 10 | |
| 0 |
| Phosphorus (P), % | 0 to 0.2 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0.15 to 0.35 | |
| 0 to 0.025 |
| Vanadium (V), % | 0 | |
| 0 to 0.040 |