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ASTM A387 Grade 21 Steel vs. EN 1.7390 Steel

Both ASTM A387 grade 21 steel and EN 1.7390 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, 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 1.7390 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
16
Fatigue Strength, MPa 160 to 250
310
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
74
Shear Strength, MPa 310 to 370
440
Tensile Strength: Ultimate (UTS), MPa 500 to 590
710
Tensile Strength: Yield (Proof), MPa 230 to 350
480

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Maximum Temperature: Mechanical, °C 480
510
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
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
8.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
9.3

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
4.3
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
1.7
Embodied Energy, MJ/kg 23
23
Embodied Water, L/kg 62
69

Common Calculations

PREN (Pitting Resistance) 6.4
6.8
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
100
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
600
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18 to 21
25
Strength to Weight: Bending, points 18 to 20
23
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 14 to 17
20

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.18
Chromium (Cr), % 2.8 to 3.3
4.0 to 6.0
Iron (Fe), % 94.4 to 96
91.9 to 95.3
Manganese (Mn), % 0.3 to 0.6
0.3 to 0.8
Molybdenum (Mo), % 0.9 to 1.1
0.45 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 0.015