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ACI-ASTM CH20 Steel vs. ASTM Grade HE Steel

Both ACI-ASTM CH20 steel and ASTM grade HE steel are iron alloys. They have a very high 95% of their average alloy composition in common.

For each property being compared, the top bar is ACI-ASTM CH20 steel and the bottom bar is ASTM grade HE steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 38
10
Fatigue Strength, MPa 290
160
Poisson's Ratio 0.27
0.27
Shear Modulus, GPa 78
79
Tensile Strength: Ultimate (UTS), MPa 610
670
Tensile Strength: Yield (Proof), MPa 350
310

Thermal Properties

Latent Heat of Fusion, J/g 310
310
Maximum Temperature: Corrosion, °C 440
450
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1410
1400
Melting Onset (Solidus), °C 1430
1360
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 14
14
Thermal Expansion, µm/m-K 15
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 20
19
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.7
3.5
Embodied Energy, MJ/kg 53
50
Embodied Water, L/kg 180
190

Common Calculations

PREN (Pitting Resistance) 25
29
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
56
Resilience: Unit (Modulus of Resilience), kJ/m3 300
240
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 22
24
Strength to Weight: Bending, points 21
22
Thermal Diffusivity, mm2/s 3.7
3.6
Thermal Shock Resistance, points 15
14

Alloy Composition

Carbon (C), % 0 to 0.2
0.2 to 0.5
Chromium (Cr), % 22 to 26
26 to 30
Iron (Fe), % 54.7 to 66
53.9 to 65.8
Manganese (Mn), % 0 to 1.5
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0 to 0.5
Nickel (Ni), % 12 to 15
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