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ACI-ASTM CF20 Steel vs. ASTM A387 Grade 21 Steel

Both ACI-ASTM CF20 steel and ASTM A387 grade 21 steel are iron alloys. They have 73% 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 ACI-ASTM CF20 steel and the bottom bar is ASTM A387 grade 21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 50
21
Fatigue Strength, MPa 240
160 to 250
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
74
Tensile Strength: Ultimate (UTS), MPa 530
500 to 590
Tensile Strength: Yield (Proof), MPa 250
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 300
260
Maximum Temperature: Mechanical, °C 970
480
Melting Completion (Liquidus), °C 1420
1470
Melting Onset (Solidus), °C 1410
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
41
Thermal Expansion, µm/m-K 17
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 16
4.1
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.1
1.8
Embodied Energy, MJ/kg 44
23
Embodied Water, L/kg 150
62

Common Calculations

PREN (Pitting Resistance) 20
6.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
84 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 160
140 to 320
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
18 to 21
Strength to Weight: Bending, points 19
18 to 20
Thermal Diffusivity, mm2/s 4.3
11
Thermal Shock Resistance, points 11
14 to 17

Alloy Composition

Carbon (C), % 0 to 0.2
0.050 to 0.15
Chromium (Cr), % 18 to 21
2.8 to 3.3
Iron (Fe), % 64.2 to 74
94.4 to 96
Manganese (Mn), % 0 to 1.5
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 8.0 to 11
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.025