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ASTM A387 Grade 21L Class 1 vs. EN 1.7231 Steel

Both ASTM A387 grade 21L class 1 and EN 1.7231 steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 30 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 21L class 1 and the bottom bar is EN 1.7231 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
240 to 280
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
11 to 12
Fatigue Strength, MPa 160
360 to 500
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Tensile Strength: Ultimate (UTS), MPa 500
790 to 930
Tensile Strength: Yield (Proof), MPa 230
570 to 800

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 480
420
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
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
2.5
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
1.5
Embodied Energy, MJ/kg 23
20
Embodied Water, L/kg 62
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84
87 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 140
870 to 1700
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18
28 to 33
Strength to Weight: Bending, points 18
24 to 27
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 14
23 to 27

Alloy Composition

Carbon (C), % 0 to 0.1
0.38 to 0.45
Chromium (Cr), % 2.8 to 3.3
0.8 to 1.2
Iron (Fe), % 94.4 to 96.1
96.4 to 98.1
Manganese (Mn), % 0.3 to 0.6
0.6 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
0.15 to 0.3
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 0.6
Sulfur (S), % 0 to 0.025
0 to 0.030