EN 1.4640 Stainless Steel vs. EN 1.4988 Stainless Steel
Both EN 1.4640 stainless steel and EN 1.4988 stainless steel are iron alloys. They have 90% of their average alloy composition in common.
For each property being compared, the top bar is EN 1.4640 stainless steel and the bottom bar is EN 1.4988 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 190 to 200 | |
| 190 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 51 | |
| 34 |
| Fatigue Strength, MPa | 230 to 250 | |
| 230 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 77 | |
| 77 |
| Shear Strength, MPa | 440 to 460 | |
| 430 |
| Tensile Strength: Ultimate (UTS), MPa | 620 to 650 | |
| 640 |
| Tensile Strength: Yield (Proof), MPa | 240 to 260 | |
| 290 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 290 |
| Maximum Temperature: Corrosion, °C | 420 | |
| 520 |
| Maximum Temperature: Mechanical, °C | 930 | |
| 920 |
| Melting Completion (Liquidus), °C | 1420 | |
| 1450 |
| Melting Onset (Solidus), °C | 1380 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 470 |
| Thermal Conductivity, W/m-K | 15 | |
| 15 |
| Thermal Expansion, µm/m-K | 16 | |
| 16 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.4 | |
| 2.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.7 | |
| 2.5 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 14 | |
| 23 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 2.8 | |
| 6.0 |
| Embodied Energy, MJ/kg | 40 | |
| 89 |
| Embodied Water, L/kg | 150 | |
| 150 |
Common Calculations
| PREN (Pitting Resistance) | 20 | |
| 22 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 250 to 260 | |
| 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 150 to 170 | |
| 210 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 22 to 23 | |
| 23 |
| Strength to Weight: Bending, points | 21 | |
| 21 |
| Thermal Diffusivity, mm2/s | 4.0 | |
| 4.0 |
| Thermal Shock Resistance, points | 14 to 15 | |
| 14 |
Alloy Composition
| Carbon (C), % | 0.030 to 0.080 | |
| 0.040 to 0.1 |
| Chromium (Cr), % | 18 to 19 | |
| 15.5 to 17.5 |
| Copper (Cu), % | 1.3 to 2.0 | |
| 0 |
| Iron (Fe), % | 67.4 to 73.6 | |
| 62.1 to 69.5 |
| Manganese (Mn), % | 1.5 to 4.0 | |
| 0 to 1.5 |
| Molybdenum (Mo), % | 0 | |
| 1.1 to 1.5 |
| Nickel (Ni), % | 5.5 to 6.9 | |
| 12.5 to 14.5 |
| Niobium (Nb), % | 0 | |
| 0.4 to 1.2 |
| Nitrogen (N), % | 0.030 to 0.11 | |
| 0.060 to 0.14 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 0.5 | |
| 0.3 to 0.6 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.015 |
| Vanadium (V), % | 0 | |
| 0.6 to 0.85 |