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ASTM A387 Grade 21 Steel vs. EN 1.7201 Steel

Both ASTM A387 grade 21 steel and EN 1.7201 steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (7, 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 1.7201 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
130 to 160
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Tensile Strength: Ultimate (UTS), MPa 500 to 590
430 to 1300

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
45
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
8.3

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

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 21
15 to 46
Strength to Weight: Bending, points 18 to 20
16 to 34
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 14 to 17
13 to 38

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.1 to 0.15
Chromium (Cr), % 2.8 to 3.3
0.9 to 1.2
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 94.4 to 96
96.9 to 98.3
Manganese (Mn), % 0.3 to 0.6
0.6 to 0.9
Molybdenum (Mo), % 0.9 to 1.1
0.15 to 0.25
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 0.3
Sulfur (S), % 0 to 0.025
0 to 0.025