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ASTM A387 Grade 21L Class 1 vs. EN 1.7233 Steel

Both ASTM A387 grade 21L class 1 and EN 1.7233 steel are iron alloys. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is ASTM A387 grade 21L class 1 and the bottom bar is EN 1.7233 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
210 to 290
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
18 to 23
Fatigue Strength, MPa 160
270 to 530
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Shear Strength, MPa 310
450 to 590
Tensile Strength: Ultimate (UTS), MPa 500
700 to 960
Tensile Strength: Yield (Proof), MPa 230
380 to 780

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 480
430
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
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
3.0
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
1.6
Embodied Energy, MJ/kg 23
21
Embodied Water, L/kg 62
53

Common Calculations

PREN (Pitting Resistance) 6.4
3.3
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84
110 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 140
380 to 1630
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18
25 to 34
Strength to Weight: Bending, points 18
22 to 28
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 14
21 to 28

Alloy Composition

Carbon (C), % 0 to 0.1
0.39 to 0.45
Chromium (Cr), % 2.8 to 3.3
1.2 to 1.5
Iron (Fe), % 94.4 to 96.1
96.2 to 97.5
Manganese (Mn), % 0.3 to 0.6
0.4 to 0.7
Molybdenum (Mo), % 0.9 to 1.1
0.5 to 0.7
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 0.4
Sulfur (S), % 0 to 0.025
0 to 0.035