ER347 Filler Wire
ER347 filler wire is a niobium-stabilized stainless steel consumable. It welds Type 347, 321 and other compatible grades and resists intergranular corrosion after the weld is exposed to high temperatures. Most orders come in alongside our bars and fasteners line, especially on process piping jobs.
ER347 Filler Wire Datasheet
ER347 filler wire ships in TIG rod and MIG wire form, built for stainless grades that need niobium stabilization against intergranular corrosion. Full chemical limits, mechanical data, and packaging details are in the datasheet below.
What is ER347 Filler Wire?
ER347 is a niobium-stabilized filler metal. Niobium binds with carbon before it can react with chromium, helping prevent chromium-depleted zones and reducing the risk of intergranular corrosion. That matters most after stress-relief heat treatment or long service at elevated temperature, just as it does with Type 347 base metal.
ER347 Filler Wire Specifications
ER347 filler wire falls under AWS A5.9 / ASME SFA-5.9. TIG rod ships as straight cut lengths. MIG wire comes on spools or coils. Diameters depend on what you’re welding and how. We often supply it with stainless steel flanges on the same piping order. Check sizes and packaging against the datasheet before you place the order, since stock varies by batch.
ER347 filler wire is a niobium-stabilized stainless steel welding material engineered for TIG and MIG processes. It provides exceptional heat and corrosion resistance across various structural applications.
AWS Classification
ER347
Applicable Standard
AWS A5.9 / ASME SFA-5.9
Material Type
Niobium-stabilized stainless steel filler metal
Welding Processes
TIG and MIG, depending on the product form
Available Diameters
Confirm from the product datasheet
Product Forms
TIG rods and MIG wire
Packaging
Confirm available options
Reach out to Metracore Alloys Private Limited for reliable ER347 Filler Wire Solutions
ER347 Filler Wire Chemical Composition and Technical Data
These figures serve as general estimates rather than fixed guarantees, as chemical and mechanical properties can vary slightly between manufacturing batches. The composition table follows AWS A5.9 limits. The mechanical figures are typical weld metal results, not a specified minimum under the standard.
ER347 Filler Wire Chemical Composition
| Element | Symbol | Composition (%) |
| Carbon | C | 0.08 max |
| Chromium | Cr | 19.00 to 21.50 |
| Nickel | Ni | 9.00 to 11.00 |
| Manganese | Mn | 1.00 to 2.50 |
| Silicon | Si | 0.90 max |
| Niobium (+ Tantalum) | Nb | 10xC min, 1.00 max |
| Phosphorus | P | 0.03 max |
| Sulfur | S | 0.03 max |
These are AWS A5.9 limits. Check the mill test report for the actual batch before signing off on a weld procedure.
ER347 Filler Wire Mechanical Properties
| Property | Value |
| Tensile Strength | 80,000 psi (550 MPa), typical as-welded |
| Yield Strength | 55,000 psi (380 MPa), typical as-welded |
| Elongation | 35%, typical over a 2-inch gauge length |
Typical as-welded numbers are reported by manufacturers rather than mandated by AWS A5.9. The standard covers composition, not mechanical minimums here. Ask for the test report if the project needs one on record.
ER347 TIG Rod and MIG Welding Wire
ER347 TIG rod comes in straight lengths, usually 36 inches, for manual TIG where the welder feeds it by hand. Some buyers look for ER347 filler rod instead, same product, different name. ER347 welding wire for MIG sits on a spool and feeds continuously, so it suits higher deposition and longer runs. Which one you need comes down to thickness, access, and how much welding there is to do. TIG holds the puddle better on thin-walled pipe. MIG moves faster once sections get thicker.
ER347 Filler Wire Applications
- Welding Type 347 and 321 piping in petrochemical and refinery plants
- Pressure vessel and heat exchanger fabrication, where post-weld heat treatment is part of the job
- Exhaust systems and furnace parts that sit at high temperatures for long periods
- Power generation parts that need a stabilized, corrosion-resistant weld
- Food and chemical handling equipment, where weld corrosion isn’t an option
- Repair welding on niobium-stabilized base metal
Manufacturing Process of ER347 Filler Wire
- Checking the chromium-nickel-niobium mix of the raw material
- Melting and refining in an electric arc or vacuum induction furnace
- Hot working into rod or wire rod, by rolling or extrusion
- Cold drawing down to final diameter and finish
- Straightening and cutting for TIG rod, or spooling for MIG wire
- Cleaning, inspection, and packing before it goes out
Why Choose Our ER347 Filler Wire?
Metracore Alloys supplies ER347 filler wire checked against manufacturer paperwork before it goes out the door. TIG rod and MIG wire, standard diameters, mill test certificates on request. Tell our team the base metal, welding process, and service temperature, and we’ll confirm it’s the right call before you order.
ER347 Filler Wire Manufacturer and Supplier
Metracore Alloys Private Limited supplies bars & fasteners, flanges, filler wires, and welding electrodes to the oil & gas, petrochemical, fabrication, and infrastructure sectors.
We supply ER347 filler wire as both TIG rod and MIG wire, in standard diameters, with documentation on every dispatch so you’re not chasing paperwork after the order ships. We’ve handled bulk orders for fabrication shops and EPC contractors before, with consolidated packaging and lead time confirmed upfront. Get in touch for pricing, stock, or the technical specifications you need.
Frequently Asked Questions
What is ER347 filler wire used for?
It welds Type 347 and related stabilized grades where the weld will see sustained temperatures above 450C, think petrochemical piping and pressure vessels. Some buyers call it ER347 welding rod instead, same product.
What is the difference between ER347 TIG rod and ER347 welding wire?
TIG rod is cut to length, fed by hand. MIG wire is on a spool, fed continuously. Pick based on process, joint thickness, and how much you’re welding.
What sizes and diameters are available for ER347 filler wire?
Diameters depend on the product form and the manufacturer’s batch. Check the datasheet or ask our team for current stock before ordering.
Which stainless steel grades can be welded using ER347 filler wire?
Type 347 and 321 mainly. Other niobium- or titanium-stabilized grades with a similar chromium-nickel base can work too, worth a quick suitability check first.
Which standard applies to ER347 filler wire?
AWS A5.9, also referenced as ASME SFA-5.9. It covers composition, not mechanical testing for bare filler wire.
Products
Exporter, Manufacturer & Supplier of ER347 Filler Wire in various material and sizes.