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AWS E630 vs. S31655 Stainless Steel

Both AWS E630 and S31655 stainless steel are iron alloys. They have a moderately high 90% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is AWS E630 and the bottom bar is S31655 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 8.0
39
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
78
Tensile Strength: Ultimate (UTS), MPa 1040
710

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 1430
1430
Melting Onset (Solidus), °C 1380
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 17
15
Thermal Expansion, µm/m-K 14
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 14
17
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.8
3.3
Embodied Energy, MJ/kg 40
46
Embodied Water, L/kg 140
160

Common Calculations

PREN (Pitting Resistance) 18
27
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 37
25
Strength to Weight: Bending, points 29
23
Thermal Diffusivity, mm2/s 4.5
4.0
Thermal Shock Resistance, points 28
16

Alloy Composition

Carbon (C), % 0 to 0.050
0 to 0.030
Chromium (Cr), % 16 to 16.8
19.5 to 21.5
Copper (Cu), % 3.3 to 4.0
0 to 1.0
Iron (Fe), % 71.6 to 75.9
63.2 to 71.9
Manganese (Mn), % 0.25 to 0.75
0 to 2.0
Molybdenum (Mo), % 0 to 0.75
0.5 to 1.5
Nickel (Ni), % 4.5 to 5.0
8.0 to 9.5
Niobium (Nb), % 0.15 to 0.3
0
Nitrogen (N), % 0
0.14 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015