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ASTM A387 Grade 21 Steel vs. ACI-ASTM CA6NM Steel

Both ASTM A387 grade 21 steel and ACI-ASTM CA6NM steel are iron alloys. They have 86% of their average alloy composition in common. There are 31 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 21 steel and the bottom bar is ACI-ASTM CA6NM steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
250
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
17
Fatigue Strength, MPa 160 to 250
380
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
76
Tensile Strength: Ultimate (UTS), MPa 500 to 590
850
Tensile Strength: Yield (Proof), MPa 230 to 350
620

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Maximum Temperature: Mechanical, °C 480
770
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1430
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
25
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
3.2

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
10
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
2.5
Embodied Energy, MJ/kg 23
34
Embodied Water, L/kg 62
110

Common Calculations

PREN (Pitting Resistance) 6.4
15
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
130
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
1000
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18 to 21
30
Strength to Weight: Bending, points 18 to 20
26
Thermal Diffusivity, mm2/s 11
6.7
Thermal Shock Resistance, points 14 to 17
31

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.060
Chromium (Cr), % 2.8 to 3.3
11.5 to 14
Iron (Fe), % 94.4 to 96
78.4 to 84.6
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
0.4 to 1.0
Nickel (Ni), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.030