ASTM Grade HI Steel vs. ACI-ASTM CT15C Steel
Both ASTM grade HI steel and ACI-ASTM CT15C steel are iron alloys. They have 83% of their average alloy composition in common.
For each property being compared, the top bar is ASTM grade HI steel and the bottom bar is ACI-ASTM CT15C steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 160 | |
| 140 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 11 | |
| 23 |
| Fatigue Strength, MPa | 150 | |
| 130 |
| Poisson's Ratio | 0.27 | |
| 0.28 |
| Shear Modulus, GPa | 79 | |
| 76 |
| Tensile Strength: Ultimate (UTS), MPa | 550 | |
| 500 |
| Tensile Strength: Yield (Proof), MPa | 270 | |
| 190 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 310 |
| Maximum Temperature: Corrosion, °C | 450 | |
| 560 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 1080 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1410 |
| Melting Onset (Solidus), °C | 1350 | |
| 1360 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 470 |
| Thermal Conductivity, W/m-K | 15 | |
| 12 |
| Thermal Expansion, µm/m-K | 17 | |
| 16 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.1 | |
| 1.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.4 | |
| 1.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 23 | |
| 36 |
| Density, g/cm3 | 7.8 | |
| 8.0 |
| Embodied Carbon, kg CO2/kg material | 4.1 | |
| 6.1 |
| Embodied Energy, MJ/kg | 59 | |
| 88 |
| Embodied Water, L/kg | 200 | |
| 190 |
Common Calculations
| PREN (Pitting Resistance) | 29 | |
| 20 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 52 | |
| 90 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 180 | |
| 93 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 20 | |
| 17 |
| Strength to Weight: Bending, points | 19 | |
| 17 |
| Thermal Diffusivity, mm2/s | 3.9 | |
| 3.2 |
| Thermal Shock Resistance, points | 12 | |
| 12 |
Alloy Composition
| Carbon (C), % | 0.2 to 0.5 | |
| 0.050 to 0.15 |
| Chromium (Cr), % | 26 to 30 | |
| 19 to 21 |
| Iron (Fe), % | 46.9 to 59.8 | |
| 40.3 to 49.2 |
| Manganese (Mn), % | 0 to 2.0 | |
| 0.15 to 1.5 |
| Molybdenum (Mo), % | 0 to 0.5 | |
| 0 |
| Nickel (Ni), % | 14 to 18 | |
| 31 to 34 |
| Niobium (Nb), % | 0 | |
| 0.5 to 1.5 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 2.0 | |
| 0.15 to 1.5 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.030 |