Stainless Steel Filler Wire Manufacturer & Supplier in India
Ratanakar Wire Private Limited (RWPL) is a leading SS filler wire manufacturer in India, supplying high-performance stainless steel filler wires to fabricators, welding contractors, and OEM manufacturers across all major industries. RWPL is also known for manufacturing a broad range of stainless steel welding wires used across fabrication, pressure vessel, and industrial welding applications. Our filler wires are produced at our advanced manufacturing facility in Pithampur, Madhya Pradesh, under an ISO 9001:2015 certified quality management system.
Every batch of our stainless steel filler wire undergoes rigorous in-process testing from raw material chemistry verification to final dimensional and surface inspection, so you receive consistent, weldable wire with every order. We offer the complete range of AWS ER-series filler wire grades with flexible diameters, cut lengths, and packaging options to match your exact welding requirements.
As a direct manufacturer, RWPL eliminates distributor margins and delivers competitive pricing on all stainless steel filler wires, whether you need a trial quantity or a high-volume bulk order. Our in-house facilities include precision wire drawing, solution annealing, bright annealing, straightening, and precision cutting for burr-free, ready-to-weld straight lengths.
Available Grades of stainless steel filler wire
RWPL manufactures the full range of stainless steel filler wires per AWS A5.9 and equivalent international standards. Select the correct grade based on your base metal and service environment:
| Grade | Compatible Base Metal | Primary Application | Key Property |
|---|---|---|---|
| ER 308L | SS 304, 304L, 308, 308L | General fabrication, food processing equipment, dairy tanks | Low carbon — prevents sensitisation |
| ER 309L | SS to carbon steel, dissimilar metal joints | Transition joints, cladding overlay, structural fabrication | High alloy content for dilution resistance |
| ER 310 | SS 310, 310S | Furnace components, heat treatment equipment | Oxidation resistance up to 1100°C |
| ER 316 | SS 316 | Chemical processing, marine, and industrial piping | Molybdenum for corrosion resistance |
| ER 316L | SS 316, 316L, 316Ti | Pharma, desalination, offshore, chloride environments | Low C + Mo — superior pitting resistance |
| ER 347 | SS 347, 321 | High-temp service, stabilised grade welding | Niobium stabilised — resists sensitisation at high heat |
A more detailed overview of alloy composition and application compatibility is available in our stainless steel wire grades.
Technical Specifications
All filler wires supplied by RWPL conform to the following technical parameters. Mill Test Certificates are issued with every shipment.
| Product Type | Stainless Steel Filler Wire (TIG / GTAW Wire) |
| Grades Available | ER308L · ER309L · ER310 · ER316 · ER316L · ER347 |
| Standards | AWS A5.9 · ASTM · DIN 8556 · BS · JIS · NACE · GOST |
| Standard Diameters | 1.6 mm · 2.0 mm · 2.4 mm · 3.2 mm |
| Custom Diameters | Available on request |
| Diameter Tolerance | ± 0.05 mm |
| Standard Length | 1000 mm cut lengths (custom available) |
| Surface Finish | Bright · Clean · Copper-Free |
| Supply Form | Straight cut lengths · 5 kg or 15 kg spools |
| Packaging | Moisture-protected industrial carton |
| Certification | ISO 9001:2015 · MTC provided with every lot |
| Country of Origin | India — Pithampur, Madhya Pradesh |
Key Features of Ratanakar SS Filler wire
Tight Diameter Tolerance ±0.05 mm: Consistent wire diameter ensures stable arc behaviour, uniform bead geometry, and predictable deposition in both manual and automated TIG setups.
Clean Copper-Free Surface: Bright, copper-free finish eliminates contamination risk essential for food-grade, pharmaceutical, and medical welding applications.
Low Carbon L-Grade Chemistry: ER308L, ER309L, and ER316L grades have carbon below 0.03%, preventing weld sensitisation and intergranular corrosion in post-weld service.
Smooth Arc Stability: Precision wire drawing and annealing produce a wire free from surface defects and internal stress, resulting in a smooth, spatter-free TIG arc every time.
Full AWS Mechanical Compliance: Every grade meets minimum tensile strength, yield strength, and elongation requirements per AWS A5.9, ensuring structurally sound, code-compliant weld joints.
Full Traceability via MTC: Each shipment comes with a Mill Test Certificate documenting chemical composition, mechanical properties, and heat number for complete quality traceability.
Manufacturing process & quality Assurance
Our stainless steel filler wires are produced through a controlled, multi-stage process at our Pithampur facility, delivering dimensional precision and consistent weld performance in every lot.
- Raw Material Inspection — Incoming stainless steel wire rod is tested for full chemical composition before entering production. Only materials meeting AWS grade chemistry are approved for drawing.
- Precision Wire Drawing — The rod is drawn through precision dies in multiple controlled passes to reach the target diameter with ±0.05 mm tolerance, ensuring consistent geometry throughout the coil.
- Annealing (Solution / Bright) — Heat treatment restores full ductility and relieves drawing stress, producing a soft, weldable wire that feeds smoothly without cracking or springback.
- Straightening & Precision Cutting — The annealed wire is machine-straightened and cut to exact lengths with clean, burr-free ends — ensuring the wire feeds cleanly into the weld pool without snagging.
- Final Inspection & MTC Generation — Every lot undergoes dimensional check, visual inspection, and chemistry sign-off. A Mill Test Certificate is generated per batch with full chemical and mechanical data.
- Moisture-Protected Packaging & Dispatch — Filler wires are packed in industrial-grade, moisture-resistant cartons to protect surface cleanliness during storage, transport, and long-term warehousing.
Industry Applications of Stainless Steel Filler Wires
RWPL’s SS filler wire is used across industries appliction where weld quality, joint strength, and corrosion resistance are non-negotiable.
- Food & Beverage Processing: ER308L filler wire for SS 304 tanks, conveyors, dairy pipelines, and food-grade equipment where hygiene is critical.
- Pharmaceutical & Chemical: ER316L for reactors, distillation columns, and process pipelines handling acids, solvents, and chloride-rich fluids.
- Oil, Gas & Petrochemical: ER309L and ER316L for pipeline welding, pressure vessels, and valves in upstream and downstream operations.
- Power Plants & Boilers: ER310 for furnace components, heat exchangers, and boiler parts that undergo thermal cycling at elevated temperatures.
- Automotive & Railways: Used in exhaust systems, structural components, and precision parts requiring clean, defect-free TIG welds.
- Fabrication & Heavy Engineering: ER309L enables dissimilar-metal welding between stainless steel and carbon steel in pressure vessels and frames.
- Marine & Desalination: ER316L’s molybdenum content provides outstanding pitting resistance in seawater and chloride-rich marine environments.
- Architecture & Interiors: Clean, spatter-free TIG welds on handrails, cladding, facades, and decorative stainless steel fabrication.
Why choose Ratanakar Wire for SS filler wire?
- ISO 9001:2015 Certified Manufacturing: Our entire production and quality process is ISO certified, giving you documented, auditable quality at every step from raw material to final dispatch.
- Direct Manufacturer No Middlemen: Buying directly from RWPL means the most competitive pricing on all grades of filler wire, especially on bulk and repeat orders.
- Full Grade Range from One Source: ER308L through ER347 we manufacture the complete AWS A5.9 filler wire range, simplifying your procurement to a single trusted supplier.
- Custom Specifications Accepted: Non-standard diameters, custom cut lengths, special grade compositions, and unique packaging configurations all available to your specification.
- Mill Test Certificate with Every Order: Full traceability via MTC covering chemical composition, heat number, and mechanical properties ready for your QC records and third-party audits.
- Pan-India Supply & Export Capability: We supply customers across all Indian states and export to international markets with proper documentation and reliable on-time delivery from Pithampur, MP.
- 10+ Years of Industry Experience: A decade of specialised wire manufacturing expertise means consistent quality, technical support, and a deep understanding of industry welding requirements.
What is SS filler wire, and what is it used for?
SS filler wire is a solid, straight-length stainless steel welding consumable used in TIG (GTAW) welding to fill joint gaps and build weld bead volume. It is used in food processing equipment, chemical pipelines, pressure vessels, pharmaceutical plants, oil & gas components, and architectural stainless steel, where precise, clean, high-integrity welds are required.
What is the difference between SS filler wire and MIG wire?
Stainless steel filler wires are straight-cut, length rods manually fed into the weld pool in TIG (GTAW) welding, preferred for precision, thin sections, and aesthetically clean welds. Stainless Steel MIG Wire is a continuous spool-fed wire used in GMAW welding for faster, higher-deposition welding.
Which filler wire grade should I use for SS 304 base metal?
For welding SS 304 or 304L base metal, ER308L is the recommended filler wire grade. Its composition is slightly over-alloyed to compensate for weld dilution. The low-carbon (L) designation ensures the weld deposit resists sensitisation and intergranular corrosion.
Which SS filler wire is best for marine or chemical environments?
ER316L is the correct choice for marine, pharmaceutical, and chemical processing applications. Its molybdenum content (2–3%) provides superior resistance to pitting corrosion and crevice corrosion caused by chlorides in seawater and aggressive process fluids.
Do you provide a Mill Test Certificate (MTC) with orders?
Yes. Every order is accompanied by a Material Test Certificate documenting the full chemical composition, heat number, lot number, and applicable standard (AWS A5.9 or equivalent) for complete traceability.
What standard diameters are available?
RWPL supplies filler wires in standard diameters of 1.6 mm, 2.0 mm, 2.4 mm, and 3.2 mm. Custom diameters are also available on request. All diameters are manufactured to ±0.05 mm tolerance.
Is your SS filler wire suitable for food-grade and pharmaceutical applications?
Yes. Our ER308L and ER316L filler wires are available with a copper-free bright surface finish, making them fully suitable for food-grade SS 304/316 equipment, pharmaceutical pipelines, dairy vessels, and medical devices where contamination must be eliminated.
Can I get sample or trial quantities before placing a bulk order?
Yes. RWPL accommodates both trial/sample orders and high-volume bulk supply. Contact our sales team at sales@ratanakar.com or call +91 9898897298 for details on minimum order quantities by grade and diameter.