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INOX STEEL INDIA is a global manufacturer and supplier of EFW (Electric Fusion Welded) Tubes in Stainless Steel, Duplex, Super Duplex, and Nickel Alloys, engineered specifically for heat-transfer applications including heat exchangers, condensers, boilers, coolers, reheaters, petrochemical heaters, and pressure processing systems.
Our EFW Tubes are produced in accordance with ASTM A249, ASTM A269, ASTM A312, ASTM A358, ASTM B515 / B516 / B626, and EN 10217-7, ensuring excellent weld integrity, corrosion resistance, and temperature stability.
With advanced fusion welding systems, post-weld heat treatment, and 100% radiography (RT) evaluation, every EFW tube delivers consistent performance under thermal cycling, vibration, and corrosive operating environments.
Used extensively by EPC contractors, fertilizer plants, petrochemical units, thermal power plants, desalination units, and offshore industries, INOX STEEL INDIA supplies fully certified, high-accuracy, heat-transfer-grade EFW Tubes to 60+ countries.
An EFW Tube is a welded tube manufactured using high-voltage electric arc fusion, where the edges of the plate or strip are melted and fused together, creating a full-penetration weld.
Unlike ERW (Electric Resistance Welded), EFW uses a fusion arc, enabling:
EFW tubes are the preferred choice in chemical processing, oil & gas heaters, boilers, pressure reticulation lines, and corrosive fluid handling where welded integrity must match or exceed base metal performance.
High-grade stainless steel, duplex, or nickel alloy plates/strips are edge-beveled, cleaned, and prepared for welding.
The plate/strip is roll-formed into a cylindrical shape with precise alignment of edges.
Full solution annealing to remove weld stresses and restore corrosion resistance.
Internal and external weld beads are ground or left as-welded as per standard.
All EFW weld seams undergo full radiography ensuring structural integrity.
Pickling, bright annealing, and mechanical polishing for smooth heat-transfer flow.
| Material | Grades | Standards |
| Stainless Steel | 304/L, 316/L, 321, 347, 310S | A249, A269, A312, A358 |
| Duplex | S31803 / S32205 | A790 / A928 |
| Super Duplex | S32750 / S32760 | A790 / A928 |
| Nickel Alloys | Inconel, Incoloy, Monel, Hastelloy | B515 / B516 / B626 |
| Material | Applications | Industries |
| SS 304/304L | Condensers, coolers | Pharma, food |
| SS 316/316L | Heat exchangers, evaporators | Petrochemical, marine |
| SS 321/347 | Heaters, superheaters | Refineries, power plants |
| SS 310S | Furnace tubes | Steel & chemical plants |
| Duplex / Super Duplex | Desalination exchangers | Offshore, marine |
| Nickel Alloys | High-temp exchangers | Nuclear, oil & gas |
| OD (mm) | OD (Inch) | WT (mm) | Length |
| 6 – 38 | ¼″ – 1½″ | 0.8 – 3.0 | 3 – 12 m |
| 38 – 114 | 1½″ – 4½″ | 1.0 – 6.0 | 3 – 12 m |
| 114 – 219 | 4½″ – 8″ | 2.0 – 10.0 | 6 – 12 m |
| 219 – 508 | 8″ – 20″ | 3.0 – 12.7 | 6 – 12 m |
| Material | INR/Kg | USD/Kg |
| SS 304/304L | ₹360 – ₹420 | $4.30 – $5.00 |
| SS 316/316L | ₹420 – ₹520 | $5.00 – $6.25 |
| SS 310S | ₹650 – ₹860 | $8.00 – $10.20 |
| Duplex / Super Duplex | ₹680 – ₹950 | $8.20 – $11.40 |
| Nickel Alloys | ₹2,500 – ₹3,800 | $28 – $42 |
| Material | HSN Code |
| Stainless Steel EFW | 7306.40.00 |
| Nickel Alloy EFW | 7306.90.90 |
| Duplex / Super Duplex | 7306.40.00 |
ERW uses high-frequency resistance heat, while EFW uses arc fusion. Seamless is best for high-pressure internal systems. Yes — EFW is widely used in heat exchangers, boilers, condensers, evaporators, especially in corrosive & high-temperature service. Yes — Inconel, Monel, Hastelloy, Incoloy in A358/B515/B516/B626 standards. Absolutely — 100% RT is provided for all EFW welds. Refinery • Petrochemical • Chemical • Power • Fertilizer • Marine • Offshore. How is an EFW pipe different from an ERW pipe?
EFW allows:
✔ deeper penetration
✔ thicker material welding
✔ superior corrosion resistance in weld zone Is EFW better than seamless?
EFW is superior for heat-transfer, high-temperature, and corrosive applications where welding integrity is crucial. Are EFW tubes suitable for heat exchangers?
Do you supply alloy and nickel EFW pipes?
Can I get EFW tubes with radiographic testing (RT)?
Which industries use EFW tubes the most?