Welding Wire
ER347 Stainless Steel Welding Wire
ER347 stainless steel welding wire is a niobium-stabilized filler metal for joining suitable austenitic stainless steels. It is commonly selected for Type 347 stainless steel and certain Type 321 applications where resistance to intergranular corrosion is an important consideration. Contact GD WELD for available sizes, technical specifications and export quotations.
ER347 Welding Wire: Key Characteristics
- Niobium stabilized: Niobium helps stabilize carbon and reduce chromium carbide precipitation under suitable thermal conditions.
- Intergranular corrosion resistance: Designed for applications where sensitization-related corrosion is a concern.
- Stabilized stainless steel welding: Commonly used with Type 347 stainless steel and selected compatible grades.
- Industrial supply: Product form, diameter and packaging are subject to current availability.
Applications of ER347 Stainless Steel Filler Metal
ER347 welding wire is used in stainless steel fabrication where the base material and service conditions call for a niobium-stabilized filler metal.
Typical application areas include:
- Chemical and petrochemical processing equipment
- Stainless steel process piping and pressure vessels
- Industrial equipment exposed to elevated temperatures
- Fabrication and maintenance of stabilized austenitic stainless steel components
The appropriate filler metal depends on the base-metal grade, operating environment, corrosion requirements and approved welding procedure. Confirm suitability for critical service with the relevant engineering specification.
Compatible Base Materials
ER347 is primarily intended for welding Type 347 stainless steel. It may also be considered for selected Type 321 stainless steel joints, subject to the application and welding procedure.
For dissimilar-metal joints or demanding service conditions, verify the required filler metal with the applicable design code and welding procedure specification (WPS).
Chemical Composition (wt.%)
Element | AWS A5.9 ER347 Classification Limit |
|---|---|
Carbon (C) | 0.08 max |
Chromium (Cr) | 19.0–21.5 |
Nickel (Ni) | 9.0–11.0 |
Manganese (Mn) | 1.0–2.5 |
Silicon (Si) | 0.30–0.65 |
Phosphorus (P) | 0.03 max |
Sulfur (S) | 0.03 max |
Molybdenum (Mo) | 0.75 max |
Copper (Cu) | 0.75 max |
Niobium + Tantalum (Nb + Ta) | 10 × C min; 1.0 max |
Note: These values are classification limits, not guaranteed batch results. Confirm them against the applicable AWS A5.9 edition and GD WELD's current technical data sheet. Refer to the mill test certificate for actual batch composition.
ER347 vs. ER347L vs. ER347Si
Grade | Main Distinction |
|---|---|
ER347 | Standard niobium-stabilized classification |
ER347L | Lower-carbon variant, with carbon limited to 0.03% maximum |
ER347Si | Higher-silicon variant that improves usability in gas metal arc welding |
These grades have different composition requirements and may perform differently under specific welding and service conditions. Select according to the project specification rather than treating them as interchangeable.
Product Supply and Ordering
To help us confirm the right ER347 product, please provide:
- Required diameter and product form
- Order quantity
- Applicable standard or project specification
- Packaging requirements
- Destination country
Contact GD WELD for current availability, technical documentation and an export quotation.
Frequently Used Technical Reference
ER347 is classified under AWS A5.9/A5.9M, which covers bare stainless steel welding electrodes, wires and rods. Confirm the applicable standard edition and product certification requirements before ordering.
