ASTM A387 Grade 21 Steel vs. ZA-27
ASTM A387 grade 21 steel belongs to the iron alloys classification, while ZA-27 belongs to the zinc alloys. There are 31 material properties with values for both materials. Properties with values for just one material (6, 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 ZA-27.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 150 to 180 | |
| 100 to 120 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 78 |
| Elongation at Break, % | 21 | |
| 2.0 to 4.5 |
| Fatigue Strength, MPa | 160 to 250 | |
| 110 to 170 |
| Poisson's Ratio | 0.29 | |
| 0.27 |
| Shear Modulus, GPa | 74 | |
| 31 |
| Shear Strength, MPa | 310 to 370 | |
| 230 to 330 |
| Tensile Strength: Ultimate (UTS), MPa | 500 to 590 | |
| 400 to 430 |
| Tensile Strength: Yield (Proof), MPa | 230 to 350 | |
| 260 to 370 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 130 |
| Maximum Temperature: Mechanical, °C | 480 | |
| 120 |
| Melting Completion (Liquidus), °C | 1470 | |
| 480 |
| Melting Onset (Solidus), °C | 1430 | |
| 380 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 530 |
| Thermal Conductivity, W/m-K | 41 | |
| 130 |
| Thermal Expansion, µm/m-K | 13 | |
| 26 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.6 | |
| 30 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 | |
| 53 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 4.1 | |
| 11 |
| Density, g/cm3 | 7.9 | |
| 5.0 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 4.2 |
| Embodied Energy, MJ/kg | 23 | |
| 80 |
| Embodied Water, L/kg | 62 | |
| 570 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 to 110 | |
| 8.1 to 18 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 to 320 | |
| 420 to 890 |
| Stiffness to Weight: Axial, points | 13 | |
| 8.6 |
| Stiffness to Weight: Bending, points | 24 | |
| 28 |
| Strength to Weight: Axial, points | 18 to 21 | |
| 22 to 24 |
| Strength to Weight: Bending, points | 18 to 20 | |
| 24 to 25 |
| Thermal Diffusivity, mm2/s | 11 | |
| 47 |
| Thermal Shock Resistance, points | 14 to 17 | |
| 14 to 15 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 25 to 28 |
| Cadmium (Cd), % | 0 | |
| 0 to 0.0060 |
| Carbon (C), % | 0.050 to 0.15 | |
| 0 |
| Chromium (Cr), % | 2.8 to 3.3 | |
| 0 |
| Copper (Cu), % | 0 | |
| 2.0 to 2.5 |
| Iron (Fe), % | 94.4 to 96 | |
| 0 to 0.1 |
| Lead (Pb), % | 0 | |
| 0 to 0.0060 |
| Magnesium (Mg), % | 0 | |
| 0.010 to 0.020 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0 |
| Molybdenum (Mo), % | 0.9 to 1.1 | |
| 0 |
| Nickel (Ni), % | 0 | |
| 0 to 0.020 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 |
| Silicon (Si), % | 0 to 0.5 | |
| 0 to 0.080 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 |
| Tin (Sn), % | 0 | |
| 0 to 0.0030 |
| Zinc (Zn), % | 0 | |
| 69.3 to 73 |