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ACI-ASTM CF8C Steel vs. ASTM Grade HI Steel

Both ACI-ASTM CF8C steel and ASTM grade HI steel are iron alloys. They have 85% of their average alloy composition in common.

For each property being compared, the top bar is ACI-ASTM CF8C steel and the bottom bar is ASTM grade HI steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
11
Fatigue Strength, MPa 220
150
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 530
550
Tensile Strength: Yield (Proof), MPa 260
270

Thermal Properties

Latent Heat of Fusion, J/g 300
310
Maximum Temperature: Corrosion, °C 490
450
Maximum Temperature: Mechanical, °C 980
1100
Melting Completion (Liquidus), °C 1420
1400
Melting Onset (Solidus), °C 1430
1350
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 17
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 19
23
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.7
4.1
Embodied Energy, MJ/kg 53
59
Embodied Water, L/kg 150
200

Common Calculations

PREN (Pitting Resistance) 20
29
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
52
Resilience: Unit (Modulus of Resilience), kJ/m3 170
180
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
20
Strength to Weight: Bending, points 19
19
Thermal Diffusivity, mm2/s 4.3
3.9
Thermal Shock Resistance, points 11
12

Alloy Composition

Carbon (C), % 0 to 0.080
0.2 to 0.5
Chromium (Cr), % 18 to 21
26 to 30
Iron (Fe), % 61.8 to 73
46.9 to 59.8
Manganese (Mn), % 0 to 1.5
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0 to 0.5
Nickel (Ni), % 9.0 to 12
14 to 18
Niobium (Nb), % 0 to 1.0
0
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