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ASTM A387 Grade 21 Steel vs. AWS E320LR

Both ASTM A387 grade 21 steel and AWS E320LR are iron alloys. They have 42% of their average alloy composition in common. There are 21 material properties with values for both materials. Properties with values for just one material (11, 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 E320LR.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
34
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
77
Tensile Strength: Ultimate (UTS), MPa 500 to 590
580

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Melting Completion (Liquidus), °C 1470
1410
Melting Onset (Solidus), °C 1430
1360
Specific Heat Capacity, J/kg-K 470
460
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
36
Density, g/cm3 7.9
8.2
Embodied Carbon, kg CO2/kg material 1.8
6.2
Embodied Energy, MJ/kg 23
87
Embodied Water, L/kg 62
220

Common Calculations

PREN (Pitting Resistance) 6.4
28
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 21
20
Strength to Weight: Bending, points 18 to 20
19
Thermal Shock Resistance, points 14 to 17
15

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.030
Chromium (Cr), % 2.8 to 3.3
19 to 21
Copper (Cu), % 0
3.0 to 4.0
Iron (Fe), % 94.4 to 96
32.7 to 42.5
Manganese (Mn), % 0.3 to 0.6
1.5 to 2.5
Molybdenum (Mo), % 0.9 to 1.1
2.0 to 3.0
Nickel (Ni), % 0
32 to 36
Niobium (Nb), % 0
0 to 0.4
Phosphorus (P), % 0 to 0.025
0 to 0.020
Silicon (Si), % 0 to 0.5
0 to 0.3
Sulfur (S), % 0 to 0.025
0 to 0.015