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ASTM A387 Grade 21L Class 1 vs. AWS E630

Both ASTM A387 grade 21L class 1 and AWS E630 are iron alloys. They have 78% 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 21L class 1 and the bottom bar is AWS E630.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
8.0
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
76
Tensile Strength: Ultimate (UTS), MPa 500
1040

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Melting Completion (Liquidus), °C 1470
1430
Melting Onset (Solidus), °C 1430
1380
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 41
17
Thermal Expansion, µm/m-K 13
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
14
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
2.8
Embodied Energy, MJ/kg 23
40
Embodied Water, L/kg 62
140

Common Calculations

PREN (Pitting Resistance) 6.4
18
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
37
Strength to Weight: Bending, points 18
29
Thermal Diffusivity, mm2/s 11
4.5
Thermal Shock Resistance, points 14
28

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.050
Chromium (Cr), % 2.8 to 3.3
16 to 16.8
Copper (Cu), % 0
3.3 to 4.0
Iron (Fe), % 94.4 to 96.1
71.6 to 75.9
Manganese (Mn), % 0.3 to 0.6
0.25 to 0.75
Molybdenum (Mo), % 0.9 to 1.1
0 to 0.75
Nickel (Ni), % 0
4.5 to 5.0
Niobium (Nb), % 0
0.15 to 0.3
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 0.75
Sulfur (S), % 0 to 0.025
0 to 0.030