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ASTM A387 Grade 21 Steel vs. AWS E2594

Both ASTM A387 grade 21 steel and AWS E2594 are iron alloys. They have 64% 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 AWS E2594.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 21
17
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 74
81
Tensile Strength: Ultimate (UTS), MPa 500 to 590
850

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1430
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
16
Thermal Expansion, µm/m-K 13
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
22
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
4.3
Embodied Energy, MJ/kg 23
60
Embodied Water, L/kg 62
190

Common Calculations

PREN (Pitting Resistance) 6.4
43
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18 to 21
30
Strength to Weight: Bending, points 18 to 20
25
Thermal Diffusivity, mm2/s 11
4.3
Thermal Shock Resistance, points 14 to 17
21

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.040
Chromium (Cr), % 2.8 to 3.3
24 to 27
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 94.4 to 96
53.8 to 63.8
Manganese (Mn), % 0.3 to 0.6
0.5 to 2.0
Molybdenum (Mo), % 0.9 to 1.1
3.5 to 4.5
Nickel (Ni), % 0
8.0 to 10.5
Nitrogen (N), % 0
0.2 to 0.3
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.030