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ASTM A387 Grade 21 Steel vs. SAE-AISI A3 Steel

Both ASTM A387 grade 21 steel and SAE-AISI A3 steel are iron alloys. They have a very high 95% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (8, 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 SAE-AISI A3 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Tensile Strength: Ultimate (UTS), MPa 500 to 590
700 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1430
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 41
37
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
8.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
9.7

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
6.0
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
4.4
Embodied Energy, MJ/kg 23
67
Embodied Water, L/kg 62
78

Common Calculations

PREN (Pitting Resistance) 6.4
8.9
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18 to 21
25 to 77
Strength to Weight: Bending, points 18 to 20
23 to 48
Thermal Diffusivity, mm2/s 11
10
Thermal Shock Resistance, points 14 to 17
23 to 70

Alloy Composition

Carbon (C), % 0.050 to 0.15
1.2 to 1.3
Chromium (Cr), % 2.8 to 3.3
4.8 to 5.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 94.4 to 96
88.7 to 92
Manganese (Mn), % 0.3 to 0.6
0.4 to 0.6
Molybdenum (Mo), % 0.9 to 1.1
0.9 to 1.4
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.025
0 to 0.030
Vanadium (V), % 0
0.8 to 1.4

Comparable Variants