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ASTM A387 Grade 2 Steel vs. ACI-ASTM CH20 Steel

Both ASTM A387 grade 2 steel and ACI-ASTM CH20 steel are iron alloys. They have 62% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 2 steel and the bottom bar is ACI-ASTM CH20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140 to 170
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 25
38
Fatigue Strength, MPa 190 to 250
290
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 73
78
Tensile Strength: Ultimate (UTS), MPa 470 to 550
610
Tensile Strength: Yield (Proof), MPa 260 to 350
350

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 420
1100
Melting Completion (Liquidus), °C 1470
1410
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 45
14
Thermal Expansion, µm/m-K 13
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
20
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.6
3.7
Embodied Energy, MJ/kg 20
53
Embodied Water, L/kg 50
180

Common Calculations

PREN (Pitting Resistance) 2.4
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 98 to 120
200
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 320
300
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 16 to 20
22
Strength to Weight: Bending, points 17 to 19
21
Thermal Diffusivity, mm2/s 12
3.7
Thermal Shock Resistance, points 14 to 16
15

Alloy Composition

Carbon (C), % 0.050 to 0.21
0 to 0.2
Chromium (Cr), % 0.5 to 0.8
22 to 26
Iron (Fe), % 97.1 to 98.3
54.7 to 66
Manganese (Mn), % 0.55 to 0.8
0 to 1.5
Molybdenum (Mo), % 0.45 to 0.6
0 to 0.5
Nickel (Ni), % 0
12 to 15
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0.15 to 0.4
0 to 2.0
Sulfur (S), % 0 to 0.025
0 to 0.040