ASTM Grade HI Steel vs. ACI-ASTM CH20 Steel
Both ASTM grade HI steel and ACI-ASTM CH20 steel are iron alloys. They have a moderately high 93% 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 CH20 steel.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 160 | |
190 |
Elastic (Young's, Tensile) Modulus, GPa | 200 | |
200 |
Elongation at Break, % | 11 | |
38 |
Fatigue Strength, MPa | 150 | |
290 |
Poisson's Ratio | 0.27 | |
0.27 |
Shear Modulus, GPa | 79 | |
78 |
Tensile Strength: Ultimate (UTS), MPa | 550 | |
610 |
Tensile Strength: Yield (Proof), MPa | 270 | |
350 |
Thermal Properties
Latent Heat of Fusion, J/g | 310 | |
310 |
Maximum Temperature: Corrosion, °C | 450 | |
440 |
Maximum Temperature: Mechanical, °C | 1100 | |
1100 |
Melting Completion (Liquidus), °C | 1400 | |
1410 |
Melting Onset (Solidus), °C | 1350 | |
1430 |
Specific Heat Capacity, J/kg-K | 490 | |
480 |
Thermal Conductivity, W/m-K | 15 | |
14 |
Thermal Expansion, µm/m-K | 17 | |
15 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 2.1 | |
2.0 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 2.4 | |
2.3 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 23 | |
20 |
Density, g/cm3 | 7.8 | |
7.8 |
Embodied Carbon, kg CO2/kg material | 4.1 | |
3.7 |
Embodied Energy, MJ/kg | 59 | |
53 |
Embodied Water, L/kg | 200 | |
180 |
Common Calculations
PREN (Pitting Resistance) | 29 | |
25 |
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 52 | |
200 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 180 | |
300 |
Stiffness to Weight: Axial, points | 14 | |
14 |
Stiffness to Weight: Bending, points | 25 | |
25 |
Strength to Weight: Axial, points | 20 | |
22 |
Strength to Weight: Bending, points | 19 | |
21 |
Thermal Diffusivity, mm2/s | 3.9 | |
3.7 |
Thermal Shock Resistance, points | 12 | |
15 |
Alloy Composition
Carbon (C), % | 0.2 to 0.5 | |
0 to 0.2 |
Chromium (Cr), % | 26 to 30 | |
22 to 26 |
Iron (Fe), % | 46.9 to 59.8 | |
54.7 to 66 |
Manganese (Mn), % | 0 to 2.0 | |
0 to 1.5 |
Molybdenum (Mo), % | 0 to 0.5 | |
0 to 0.5 |
Nickel (Ni), % | 14 to 18 | |
12 to 15 |
Phosphorus (P), % | 0 to 0.040 | |
0 to 0.040 |
Silicon (Si), % | 0 to 2.0 | |
0 to 2.0 |
Sulfur (S), % | 0 to 0.040 | |
0 to 0.040 |