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ASTM A387 Grade 21L Class 1 vs. SAE-AISI 1040 Steel

Both ASTM A387 grade 21L class 1 and SAE-AISI 1040 steel are iron alloys. They have a very high 96% 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 ASTM A387 grade 21L class 1 and the bottom bar is SAE-AISI 1040 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
160 to 180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
13 to 20
Fatigue Strength, MPa 160
220 to 340
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Shear Strength, MPa 310
350 to 390
Tensile Strength: Ultimate (UTS), MPa 500
570 to 640
Tensile Strength: Yield (Proof), MPa 230
320 to 530

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 480
400
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 41
51
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.0

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
1.8
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
1.4
Embodied Energy, MJ/kg 23
18
Embodied Water, L/kg 62
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84
79 to 96
Resilience: Unit (Modulus of Resilience), kJ/m3 140
270 to 760
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18
20 to 23
Strength to Weight: Bending, points 18
19 to 21
Thermal Diffusivity, mm2/s 11
14
Thermal Shock Resistance, points 14
18 to 20

Alloy Composition

Carbon (C), % 0 to 0.1
0.37 to 0.44
Chromium (Cr), % 2.8 to 3.3
0
Iron (Fe), % 94.4 to 96.1
98.6 to 99.03
Manganese (Mn), % 0.3 to 0.6
0.6 to 0.9
Molybdenum (Mo), % 0.9 to 1.1
0
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0
Sulfur (S), % 0 to 0.025
0 to 0.050