ASTM A387 Grade 21 Steel vs. Nickel Beryllium 360
ASTM A387 grade 21 steel belongs to the iron alloys classification, while nickel beryllium 360 belongs to the nickel alloys. There are 24 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is ASTM A387 grade 21 steel and the bottom bar is nickel beryllium 360.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 21 | |
| 1.0 to 30 |
| Fatigue Strength, MPa | 160 to 250 | |
| 260 to 710 |
| Poisson's Ratio | 0.29 | |
| 0.3 |
| Shear Modulus, GPa | 74 | |
| 77 |
| Shear Strength, MPa | 310 to 370 | |
| 510 to 1100 |
| Tensile Strength: Ultimate (UTS), MPa | 500 to 590 | |
| 780 to 1860 |
| Tensile Strength: Yield (Proof), MPa | 230 to 350 | |
| 380 to 1590 |
Thermal Properties
| Melting Completion (Liquidus), °C | 1470 | |
| 1330 |
| Melting Onset (Solidus), °C | 1430 | |
| 1200 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 460 |
| Thermal Conductivity, W/m-K | 41 | |
| 48 |
| Thermal Expansion, µm/m-K | 13 | |
| 14 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.6 | |
| 5.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 | |
| 5.4 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.9 | |
| 8.3 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 to 110 | |
| 12 to 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 to 320 | |
| 360 to 3440 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 18 to 21 | |
| 26 to 62 |
| Strength to Weight: Bending, points | 18 to 20 | |
| 23 to 41 |
| Thermal Diffusivity, mm2/s | 11 | |
| 13 |
| Thermal Shock Resistance, points | 14 to 17 | |
| 19 to 46 |