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ASTM A387 Grade 21L Class 1 vs. ACI-ASTM CB7Cu-1 Steel

Both ASTM A387 grade 21L class 1 and ACI-ASTM CB7Cu-1 steel are iron alloys. They have 79% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 21L class 1 and the bottom bar is ACI-ASTM CB7Cu-1 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
300 to 420
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
5.7 to 11
Fatigue Strength, MPa 160
420 to 590
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
76
Tensile Strength: Ultimate (UTS), MPa 500
960 to 1350
Tensile Strength: Yield (Proof), MPa 230
760 to 1180

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Melting Completion (Liquidus), °C 1470
1430
Melting Onset (Solidus), °C 1430
1500
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
13
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
2.6
Embodied Energy, MJ/kg 23
38
Embodied Water, L/kg 62
130

Common Calculations

PREN (Pitting Resistance) 6.4
17
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 140
1500 to 3590
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
34 to 48
Strength to Weight: Bending, points 18
28 to 35
Thermal Diffusivity, mm2/s 11
4.6
Thermal Shock Resistance, points 14
32 to 45

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.070
Chromium (Cr), % 2.8 to 3.3
15.5 to 17.7
Copper (Cu), % 0
2.5 to 3.2
Iron (Fe), % 94.4 to 96.1
72.3 to 78.4
Manganese (Mn), % 0.3 to 0.6
0 to 0.7
Molybdenum (Mo), % 0.9 to 1.1
0
Nickel (Ni), % 0
3.6 to 4.6
Niobium (Nb), % 0
0 to 0.35
Nitrogen (N), % 0
0 to 0.050
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.030