AWS E630 (W37410) Weld Metal
AWS E630 is a weld metal formulated for joining stainless steels. Cited properties are appropriate for the post-weld heat treated (PWHT) condition. E630 is the AWS designation for this material. W37410 is the UNS number. Additionally, the ISO numeric designation is ES630.
It has the highest tensile strength among stainless steel welding fillers. In addition, it has the lowest ductility and a very low embodied energy.
The graph bars on the material properties cards below compare AWS E630 to: stainless steel welding fillers (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
190 GPa 28 x 106 psi
Elongation at Break
8.0 %
Poisson's Ratio
0.28
Shear Modulus
76 GPa 11 x 106 psi
Tensile Strength: Ultimate (UTS)
1040 MPa 150 x 103 psi
Thermal Properties
Latent Heat of Fusion
280 J/g
Melting Completion (Liquidus)
1430 °C 2600 °F
Melting Onset (Solidus)
1380 °C 2520 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
17 W/m-K 9.7 BTU/h-ft-°F
Thermal Expansion
14 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.3 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.6 % IACS
Otherwise Unclassified Properties
Base Metal Price
14 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
2.8 kg CO2/kg material
Embodied Energy
40 MJ/kg 17 x 103 BTU/lb
Embodied Water
140 L/kg 16 gal/lb
Common Calculations
PREN (Pitting Resistance)
18
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
37 points
Strength to Weight: Bending
29 points
Thermal Diffusivity
4.5 mm2/s
Thermal Shock Resistance
28 points
Alloy Composition
| Fe | 71.6 to 75.9 | |
| Cr | 16 to 16.8 | |
| Ni | 4.5 to 5.0 | |
| Cu | 3.3 to 4.0 | |
| Mn | 0.25 to 0.75 | |
| Si | 0 to 0.75 | |
| Mo | 0 to 0.75 | |
| Nb | 0.15 to 0.3 | |
| C | 0 to 0.050 | |
| P | 0 to 0.040 | |
| S | 0 to 0.030 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
AWS A5.4: Specification for Stainless Steel Electrodes for Shielded Metal Arc Welding
Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005
Welding Metallurgy of Stainless Steels, Erich Folkhard et al., 2012