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ASTM A387 Grade 21 Steel vs. EN 1.3551 Steel

Both ASTM A387 grade 21 steel and EN 1.3551 steel are iron alloys. They have a moderately high 95% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 21 steel and the bottom bar is EN 1.3551 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
220
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
75
Tensile Strength: Ultimate (UTS), MPa 500 to 590
720

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Maximum Temperature: Mechanical, °C 480
530
Melting Completion (Liquidus), °C 1470
1490
Melting Onset (Solidus), °C 1430
1450
Specific Heat Capacity, J/kg-K 470
460
Thermal Conductivity, W/m-K 41
36
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
8.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
9.9

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
9.0
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 1.8
4.9
Embodied Energy, MJ/kg 23
71
Embodied Water, L/kg 62
82

Common Calculations

PREN (Pitting Resistance) 6.4
18
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 21
26
Strength to Weight: Bending, points 18 to 20
23
Thermal Diffusivity, mm2/s 11
9.8
Thermal Shock Resistance, points 14 to 17
21

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.77 to 0.85
Chromium (Cr), % 2.8 to 3.3
3.9 to 4.3
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 94.4 to 96
88.8 to 91.1
Manganese (Mn), % 0.3 to 0.6
0.15 to 0.35
Molybdenum (Mo), % 0.9 to 1.1
4.0 to 4.5
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 0.015
Tungsten (W), % 0
0 to 0.25
Vanadium (V), % 0
0.9 to 1.1