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AWS E409Nb vs. AISI 440A Stainless Steel

Both AWS E409Nb and AISI 440A stainless steel are iron alloys. They have a moderately high 95% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is AWS E409Nb and the bottom bar is AISI 440A stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 23
5.0 to 20
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
77
Tensile Strength: Ultimate (UTS), MPa 500
730 to 1790
Tensile Strength: Yield (Proof), MPa 380
420 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Melting Completion (Liquidus), °C 1460
1480
Melting Onset (Solidus), °C 1410
1370
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
23
Thermal Expansion, µm/m-K 14
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 13
9.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.9
2.2
Embodied Energy, MJ/kg 42
31
Embodied Water, L/kg 100
120

Common Calculations

PREN (Pitting Resistance) 14
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
87 to 120
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
26 to 65
Strength to Weight: Bending, points 18
23 to 43
Thermal Diffusivity, mm2/s 6.8
6.2
Thermal Shock Resistance, points 14
26 to 65

Alloy Composition

Carbon (C), % 0 to 0.12
0.6 to 0.75
Chromium (Cr), % 11 to 14
16 to 18
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 80.2 to 88.5
78.4 to 83.4
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.75
0 to 0.75
Nickel (Ni), % 0 to 0.6
0
Niobium (Nb), % 0.5 to 1.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015