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AWS E309Nb vs. ASTM A372 Grade K Steel

Both AWS E309Nb and ASTM A372 grade K steel are iron alloys. They have 65% 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 E309Nb and the bottom bar is ASTM A372 grade K steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 34
23
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
73
Tensile Strength: Ultimate (UTS), MPa 620
780

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
48
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 25
4.4
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 4.4
1.8
Embodied Energy, MJ/kg 64
24
Embodied Water, L/kg 180
57

Common Calculations

PREN (Pitting Resistance) 25
2.7
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 22
27
Strength to Weight: Bending, points 21
24
Thermal Diffusivity, mm2/s 4.0
13
Thermal Shock Resistance, points 16
23

Alloy Composition

Carbon (C), % 0 to 0.12
0 to 0.18
Chromium (Cr), % 22 to 25
1.0 to 1.8
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 54.8 to 64.8
93.4 to 96.6
Manganese (Mn), % 0.5 to 2.5
0.1 to 0.4
Molybdenum (Mo), % 0 to 0.75
0.2 to 0.6
Nickel (Ni), % 12 to 14
2.0 to 3.3
Niobium (Nb), % 0.7 to 1.0
0
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.010