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SAE-AISI A3 Steel vs. ASTM A387 Grade 21L Class 1

Both SAE-AISI A3 steel and ASTM A387 grade 21L class 1 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 SAE-AISI A3 steel and the bottom bar is ASTM A387 grade 21L class 1.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

Carbon (C), % 1.2 to 1.3
0 to 0.1
Chromium (Cr), % 4.8 to 5.5
2.8 to 3.3
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 88.7 to 92
94.4 to 96.1
Manganese (Mn), % 0.4 to 0.6
0.3 to 0.6
Molybdenum (Mo), % 0.9 to 1.4
0.9 to 1.1
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025
Vanadium (V), % 0.8 to 1.4
0