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ASTM A387 Grade 21 Steel vs. EN 1.7378 Steel

Both ASTM A387 grade 21 steel and EN 1.7378 steel are iron alloys. Their average alloy composition is basically identical. There are 32 material properties with values for both materials. Properties with values for just one material (1, 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 1.7378 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
17
Fatigue Strength, MPa 160 to 250
330
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
74
Shear Strength, MPa 310 to 370
430
Tensile Strength: Ultimate (UTS), MPa 500 to 590
700
Tensile Strength: Yield (Proof), MPa 230 to 350
490

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Maximum Temperature: Mechanical, °C 480
460
Melting Completion (Liquidus), °C 1470
1470
Melting Onset (Solidus), °C 1430
1430
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
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
4.0
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
2.3
Embodied Energy, MJ/kg 23
33
Embodied Water, L/kg 62
61

Common Calculations

PREN (Pitting Resistance) 6.4
5.8
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
110
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
630
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 21
25
Strength to Weight: Bending, points 18 to 20
22
Thermal Diffusivity, mm2/s 11
10
Thermal Shock Resistance, points 14 to 17
20

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Boron (B), % 0
0.0015 to 0.0070
Carbon (C), % 0.050 to 0.15
0.050 to 0.1
Chromium (Cr), % 2.8 to 3.3
2.2 to 2.6
Iron (Fe), % 94.4 to 96
94.6 to 96.1
Manganese (Mn), % 0.3 to 0.6
0.3 to 0.7
Molybdenum (Mo), % 0.9 to 1.1
0.9 to 1.1
Nitrogen (N), % 0
0 to 0.010
Phosphorus (P), % 0 to 0.025
0 to 0.020
Silicon (Si), % 0 to 0.5
0.15 to 0.45
Sulfur (S), % 0 to 0.025
0 to 0.010
Titanium (Ti), % 0
0.050 to 0.1
Vanadium (V), % 0
0.2 to 0.3