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ACI-ASTM CF20 Steel vs. ASTM Grade HH Steel

Both ACI-ASTM CF20 steel and ASTM grade HH steel are iron alloys. They have 90% of their average alloy composition in common.

For each property being compared, the top bar is ACI-ASTM CF20 steel and the bottom bar is ASTM grade HH steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
170
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 50
11
Fatigue Strength, MPa 240
150
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 530
580
Tensile Strength: Yield (Proof), MPa 250
270

Thermal Properties

Latent Heat of Fusion, J/g 300
310
Maximum Temperature: Corrosion, °C 420
440
Maximum Temperature: Mechanical, °C 970
1100
Melting Completion (Liquidus), °C 1420
1400
Melting Onset (Solidus), °C 1410
1360
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
14
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 16
20
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.1
3.7
Embodied Energy, MJ/kg 44
53
Embodied Water, L/kg 150
180

Common Calculations

PREN (Pitting Resistance) 20
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
53
Resilience: Unit (Modulus of Resilience), kJ/m3 160
190
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
21
Strength to Weight: Bending, points 19
20
Thermal Diffusivity, mm2/s 4.3
3.8
Thermal Shock Resistance, points 11
12

Alloy Composition

Carbon (C), % 0 to 0.2
0.2 to 0.5
Chromium (Cr), % 18 to 21
24 to 28
Iron (Fe), % 64.2 to 74
52.9 to 64.8
Manganese (Mn), % 0 to 1.5
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 8.0 to 11
11 to 14
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