ASTM Grade HP Steel vs. Nickel 908
Both ASTM grade HP steel and nickel 908 are metals with high concentrations of iron and nickel. This makes them relatively similar, despite formally belonging to different alloy families. They have 76% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is ASTM grade HP steel and the bottom bar is nickel 908.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 180 |
| Elongation at Break, % | 5.1 | |
| 11 |
| Fatigue Strength, MPa | 130 | |
| 450 |
| Poisson's Ratio | 0.28 | |
| 0.3 |
| Shear Modulus, GPa | 78 | |
| 70 |
| Tensile Strength: Ultimate (UTS), MPa | 490 | |
| 1340 |
| Tensile Strength: Yield (Proof), MPa | 260 | |
| 930 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 920 |
| Melting Completion (Liquidus), °C | 1370 | |
| 1430 |
| Melting Onset (Solidus), °C | 1330 | |
| 1380 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 460 |
| Thermal Conductivity, W/m-K | 12 | |
| 11 |
| Thermal Expansion, µm/m-K | 16 | |
| 8.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 34 | |
| 50 |
| Density, g/cm3 | 7.9 | |
| 8.3 |
| Embodied Carbon, kg CO2/kg material | 5.8 | |
| 9.3 |
| Embodied Energy, MJ/kg | 82 | |
| 140 |
| Embodied Water, L/kg | 220 | |
| 170 |
Common Calculations
| PREN (Pitting Resistance) | 27 | |
| 4.2 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 21 | |
| 140 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 170 | |
| 2340 |
| Stiffness to Weight: Axial, points | 14 | |
| 12 |
| Stiffness to Weight: Bending, points | 25 | |
| 23 |
| Strength to Weight: Axial, points | 17 | |
| 45 |
| Strength to Weight: Bending, points | 17 | |
| 33 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 2.9 |
| Thermal Shock Resistance, points | 11 | |
| 61 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0.75 to 1.3 |
| Boron (B), % | 0 | |
| 0 to 0.012 |
| Carbon (C), % | 0.35 to 0.75 | |
| 0 to 0.030 |
| Chromium (Cr), % | 24 to 28 | |
| 3.8 to 4.5 |
| Cobalt (Co), % | 0 | |
| 0 to 0.5 |
| Copper (Cu), % | 0 | |
| 0 to 0.5 |
| Iron (Fe), % | 29.2 to 42.7 | |
| 35.6 to 44.6 |
| Manganese (Mn), % | 0 to 2.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 to 0.5 | |
| 0 |
| Nickel (Ni), % | 33 to 37 | |
| 47 to 51 |
| Niobium (Nb), % | 0 | |
| 2.7 to 3.3 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 2.5 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.0050 |
| Titanium (Ti), % | 0 | |
| 1.2 to 1.8 |