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AWS E430Nb vs. ASTM A387 Grade 91 Class 2

Both AWS E430Nb and ASTM A387 grade 91 class 2 are iron alloys. They have a moderately high 91% 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 AWS E430Nb and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 23
20
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
75
Tensile Strength: Ultimate (UTS), MPa 500
670

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 24
26
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.6
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
10

Otherwise Unclassified Properties

Base Metal Price, % relative 15
7.0
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.1
2.6
Embodied Energy, MJ/kg 45
37
Embodied Water, L/kg 120
88

Common Calculations

PREN (Pitting Resistance) 18
13
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
24
Strength to Weight: Bending, points 18
22
Thermal Diffusivity, mm2/s 6.6
6.9
Thermal Shock Resistance, points 13
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.1
0.080 to 0.12
Chromium (Cr), % 15 to 18
8.0 to 9.5
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 76.2 to 84.5
87.3 to 90.3
Manganese (Mn), % 0 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 0 to 0.75
0.85 to 1.1
Nickel (Ni), % 0 to 0.6
0 to 0.4
Niobium (Nb), % 0.5 to 1.5
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 1.0
0.2 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010