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ASTM Grade HH Steel vs. ACI-ASTM CF20 Steel

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

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

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

Latent Heat of Fusion, J/g 310
300
Maximum Temperature: Corrosion, °C 440
420
Maximum Temperature: Mechanical, °C 1100
970
Melting Completion (Liquidus), °C 1400
1420
Melting Onset (Solidus), °C 1360
1410
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
16
Thermal Expansion, µm/m-K 17
17

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 20
16
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.7
3.1
Embodied Energy, MJ/kg 53
44
Embodied Water, L/kg 180
150

Common Calculations

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

Alloy Composition

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