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ASTM A387 Grade 21L Class 1 vs. EN 1.7711 Steel

Both ASTM A387 grade 21L class 1 and EN 1.7711 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 1.7711 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
210 to 280
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
16 to 22
Fatigue Strength, MPa 160
290 to 520
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Shear Strength, MPa 310
440 to 570
Tensile Strength: Ultimate (UTS), MPa 500
690 to 930
Tensile Strength: Yield (Proof), MPa 230
400 to 800

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
33
Thermal Expansion, µm/m-K 13
11

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
2.3
Embodied Energy, MJ/kg 23
32
Embodied Water, L/kg 62
54

Common Calculations

PREN (Pitting Resistance) 6.4
2.9
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84
130 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 140
430 to 1690
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18
24 to 33
Strength to Weight: Bending, points 18
22 to 27
Thermal Diffusivity, mm2/s 11
8.9
Thermal Shock Resistance, points 14
24 to 32

Alloy Composition

Aluminum (Al), % 0
0 to 0.015
Carbon (C), % 0 to 0.1
0.36 to 0.44
Chromium (Cr), % 2.8 to 3.3
0.9 to 1.2
Iron (Fe), % 94.4 to 96.1
96 to 97.5
Manganese (Mn), % 0.3 to 0.6
0.45 to 0.85
Molybdenum (Mo), % 0.9 to 1.1
0.5 to 0.65
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 0.030
Vanadium (V), % 0
0.25 to 0.35