ASTM A387 Grade 21 Steel vs. Type 4 Magnetic Alloy
ASTM A387 grade 21 steel belongs to the iron alloys classification, while Type 4 magnetic alloy belongs to the nickel alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, 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 Type 4 magnetic alloy.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 21 | |
| 2.0 to 40 |
| Fatigue Strength, MPa | 160 to 250 | |
| 220 to 400 |
| Poisson's Ratio | 0.29 | |
| 0.31 |
| Shear Modulus, GPa | 74 | |
| 73 |
| Shear Strength, MPa | 310 to 370 | |
| 420 to 630 |
| Tensile Strength: Ultimate (UTS), MPa | 500 to 590 | |
| 620 to 1100 |
| Tensile Strength: Yield (Proof), MPa | 230 to 350 | |
| 270 to 1040 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 480 | |
| 900 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1420 |
| Melting Onset (Solidus), °C | 1430 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 440 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.6 | |
| 2.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 | |
| 3.0 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 4.1 | |
| 60 |
| Density, g/cm3 | 7.9 | |
| 8.8 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 10 |
| Embodied Energy, MJ/kg | 23 | |
| 140 |
| Embodied Water, L/kg | 62 | |
| 210 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 to 110 | |
| 22 to 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 to 320 | |
| 190 to 2840 |
| Stiffness to Weight: Axial, points | 13 | |
| 12 |
| Stiffness to Weight: Bending, points | 24 | |
| 22 |
| Strength to Weight: Axial, points | 18 to 21 | |
| 19 to 35 |
| Strength to Weight: Bending, points | 18 to 20 | |
| 18 to 27 |
| Thermal Shock Resistance, points | 14 to 17 | |
| 21 to 37 |
Alloy Composition
| Carbon (C), % | 0.050 to 0.15 | |
| 0 to 0.050 |
| Chromium (Cr), % | 2.8 to 3.3 | |
| 0 to 0.3 |
| Cobalt (Co), % | 0 | |
| 0 to 0.5 |
| Copper (Cu), % | 0 | |
| 0 to 0.3 |
| Iron (Fe), % | 94.4 to 96 | |
| 9.5 to 17.5 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0 to 0.8 |
| Molybdenum (Mo), % | 0.9 to 1.1 | |
| 3.5 to 6.0 |
| Nickel (Ni), % | 0 | |
| 79 to 82 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.010 |
| Silicon (Si), % | 0 to 0.5 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 to 0.020 |