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Fabricated Welded Tubes Manufacturer, Supplier & Exporter – INOX STEEL INDIA

INOX STEEL INDIA is a leading manufacturer of Fabricated Welded Tubes designed specifically for projects where standard sizes, shapes, or alloys are not sufficient. When engineers, OEMs, EPC contractors, and design consultants require custom OD, precision-shaped, or non-standard alloy tubes, INOX STEEL INDIA is chosen for our:

  • Multi-process welding (TIG, plasma, MIG, laser, orbital)
  • Ability to manufacture any OD, shape, or geometry
  • Expertise in stainless, duplex, nickel alloys, titanium & Cu-Ni
  • Precision tolerances for critical engineering & hygienic applications
  • Fully customised lengths, bends, collars, fabricated sections

Our Fabricated Welded Tubes are widely used in: Pharma • Food • Heat Exchangers • Marine • Defence • Aerospace • Oil & Gas • Chemical • Architectural • OEM Components. From 6 mm micro-tubing to 1200 mm custom OD fabricated sections, INOX STEEL INDIA supports both small-batch specialised requirements and long-run industrial production.

Table of Contents

What Are Fabricated Welded Tubes?

Fabricated Welded Tubes are custom-engineered tubular sections manufactured by welding sheets, strips, or profiled plates to create tubes with non-standard dimensions, shapes, or alloy combinations. They are ideal when:

  • standard ASTM/EN sizes do not fit the design
  • special corrosion/temperature resistance is required
  • unique structural support tubes are needed
  • architectural or HVAC demands special shapes
  • OEM machinery requires precise tube geometry

What makes fabricated tubes different from normal welded tubes?

Standard Welded Tube Fabricated Welded Tube
Fixed OD/WT combos ANY OD/WT combination
Limited alloys All alloys including Ni/Ti/Duplex
Round shapes Round, square, rectangle, oval, elliptical, custom
Standard lengths Custom lengths, bends & assemblies
Delivered as basic tubes Delivered as part-fabricated or fully fabricated assemblies

How Fabricated Welded Tubes Are Manufactured (Step-by-Step)

(INOX signature style — clear, engineering accurate, premium)

Manufacturing Steps:

  1. Raw Material Selection & Preparation: Sheets, coils, or plates in stainless steel, duplex, nickel alloys, or titanium are selected based on the project’s mechanical and corrosion requirements.
  2. Forming (Roll Forming / Press Brake / Custom Tools): Material is formed into the required geometry: Cylindrical, Square, Rectangular, Oval, Elliptical. Bespoke profiles created from CAD drawings.
  3. Precision Welding: Based on application, we use: TIG Welding (hygienic), Laser Welding (small HAZ), Plasma Welding (deep penetration), Orbital Welding (thin-wall), or MIG Welding (thicker plates).
  4. Weld Dressing & Seam Finishing: For stainless, duplex & nickel alloys, the weld is ground, flushed, blended with the parent material, and polished internally/externally as needed.
  5. Heat Treatment (Where Required): Solution annealing or stress relieving for Duplex alloys, Nickel alloys, and special stainless grades. Ensures corrosion resistance & restoration of grain structure.
  6. Surface Finishing: Depending on use: 2B / BA, 180–600 grit polish, Mirror polish, Mechanical polish, or Passivated surface.
  7. Testing & Dimensional Accuracy: Tubes undergo strict QA: Weld UT / RT, PMI identification, surface finish check, dimensional measurement, and squareness / ovality validation.
  8. Custom Fabrication (Optional): Ready-to-install assemblies: Collars, Mitred joints, Bends, Frames, Brackets, Headers & manifolds.

Key Advantages:

  • ANY OD, ANY SHAPE, ANY ALLOY: Full customisation beyond standard welded tubes.
  • Multi-alloy Capability: 316L • 310S • 321 • Duplex • Super Duplex • Inconel • Monel • Titanium • Cu-Ni • Aluminium • Carbon Steel.
  • High-Tech Engineering: Used in heat exchangers, marine systems, aerospace, and highly corrosive process lines.
  • Superior Weld Integrity: TIG/laser/orbital welding ensures fine seams with minimal heat distortion.
  • Design Flexibility: Ideal for façade structures, decorative frameworks, and custom furniture tubes.
  • Scalable Production: prototyping and high-volume industrial orders.

MASTER TECHNICAL DATA SHEET — FABRICATED WELDED TUBES

Category: Custom OD • Non-standard Alloys • Special-Shape Tubular Sections
Brand: INOX STEEL INDIA

ONE SINGLE CONSOLIDATED TABLE (INOX Format)

Section Parameter Technical Specification
General Product Fabricated Welded Tubes (Custom OD / Non-standard Alloy Tubes)
Alternate Names Custom Welded Tubes • Fabricated Tubular Sections • Special Alloy Welded Tubes
Manufacturing Methods TIG Welding • MIG Welding • Plasma Welding • Laser Welding • Orbital Welding
Tube Shapes Round • Square • Rectangular • Elliptical • Oval • Custom profiles
Application Category Structural • Mechanical • Heat Transfer • Food/Pharma • Chemical • Marine • Defense
Material Grades Stainless Steel 304 / 304L • 316 / 316L • 309 • 310 • 321 • 347
Duplex & Super Duplex S31803 • S32205 • S32750 • S32760
Nickel Alloys Inconel 600/625 • Monel 400 • Hastelloy C22/C276 • Incoloy 800/825
Titanium Grade 2 • Grade 5 (Ti-6Al-4V)
Other Alloys Copper-Nickel (90/10, 70/30) • Aluminium • Mild Steel • Carbon Steel
Dimensional Range Outside Diameter (OD) 6 mm – 1200 mm (custom OD on request)
Wall Thickness (WT) 0.5 mm – 12 mm (depending on alloy & shape)
Length 1–12 metres (custom fabrication possible)
Shape Tolerance As per EN 10219 / ASTM A554 (or customised)
Mechanical Properties Depends on Alloy SS 316L: YS ≥ 205 MPa • TS ≥ 515 MPa • Elongation ≥ 40%
Duplex YS ≥ 450 MPa • TS ≥ 620 MPa
Nickel Alloy High temperature & corrosion resistance
Chemical Composition As per Alloy Standard ASTM A240 / A249 / ASME SB-515 / Duplex ASTM A789 / Nickel B167 etc.
Welding Characteristics Weld Methods TIG • Laser • Plasma • Orbital welding (for precision tubes)
Weld Seam Full penetration (internal & external pass if required)
Post-weld Pickling • Passivation • Heat treatment (solution annealing for SS/duplex)
Testing & QA Mandatory Tests Flattening • Flaring • Hydraulic / Pneumatic • Visual • Dimensional
NDT Eddy Current • X-Ray (RT) • UT (Ultrasonic) • Dye Penetrant Test (DPT)
Special Tests PMI • IGC (ASTM A262) • Ferrite % • Tensile • Hardness
Standards Stainless Steel Welded ASTM A249 • A269 • A554 • EN 10217-7 • DIN 11850
Duplex & Super Duplex ASTM A789 • A790
Nickel Alloys ASTM B515 • B516 • B626
Titanium ASTM B338 • B862
Applications Heat Transfer Condensers • Exchangers • Heaters
Structural Architectural tubes • Furniture • Support frames
Marine Saltwater-resistant alloy tubes
Pharma/Food Hygienic tubes for processing
Chemical Corrosion-resistant process tubes
Coating / Surface Finish Stainless Steel 2B • BA • Polished (180–600 grit) • Mirror
Nickel Alloy Mill finish • Polished
Titanium Pickled • Polished
End Options End Type Plain • Bevelled • Flanged • Custom fabricated ends
Special Fabrication Mitred joints • Collars • Elbows • Welded assemblies
HSN Code SS/Alloy Welded Tubes 7306.40.00

Industry Applications (Overview)

Pharmaceutical & FoodHygienic tubes, manifolds, equipment parts.

Chemical & PetrochemicalCorrosion-resistant nickel alloy tubes.

Marine & OffshoreCu-Ni & duplex custom tubes for seawater systems.

HVAC & Heat TransferFabricated headers, coils, and sectional tubes.

Architectural / StructuralCustom shapes for façades, trusses, staircases.

OEM MachineryPrecision-shaped tubing for assemblies, automation machines, conveyors.

Market Demand (India & Global)

🇮🇳 India:Massive demand from pharma equipment manufacturers, architectural fabricators, specialty heat exchanger OEMs, and marine companies.

🌍 GCC / Middle East:Chemical plants, oil & gas skids, and structural modules.

🇺🇸🇪🇺 USA / Europe:Precision-engineered manifolds, aerospace & high-spec tubing.

INOX STEEL INDIA exports fabricated tubes to UAE, Qatar, Oman, Kuwait, South Africa, UK, USA, Germany, Singapore, Malaysia and more.

APPLICATIONS — TYPE / INDUSTRY / ALLOY MAPPING

A. PHARMACEUTICAL & FOOD PROCESSING

Application Description Preferred Alloys Finish
Processing Equipment Tanks, piping, manifolds 304L / 316L 180–600 grit, BA
Hygienic Tubes Low-contamination movement 316L / 321 Polished / BA
Spray Nozzles / Dosers Precision flow paths 316L 400–600 grit
OEM Pharma Machinery Structural + hygienic assemblies 304L / 316L Polished

B. CHEMICAL & PETROCHEMICAL

Application Description Preferred Alloys Reason
Corrosive Fluid Tubing Acid / chlorides Duplex, Super Duplex, Hastelloy High corrosion resistance
Heat Transfer Tubes Heaters, reboilers 316L / 321 / Duplex Thermal stability
Skid Packages Custom OD tubes for piping 316L / Duplex Robust weld integrity

C. MARINE / OFFSHORE ENGINEERING

Application Description Preferred Alloys
Sea Water Lines High-saline exposure Cu-Ni 90/10, 70/30
Platform Structures Corrosive structural tubes S31803 / S32750
Shipbuilding Custom frames / exhaust 316L / Titanium Grade 2

D. HEAT EXCHANGERS & HVAC

Application Description Material
Custom Header Tubes Fabricated manifolds SS 316L / Duplex
Coil Tubes Cooling & heating systems 304L / 316L
Condenser/Chiller Assemblies Multi-port or shaped tubes Copper • SS • Ti

E. ARCHITECTURE & STRUCTURAL

Application Description Alloys
Façade Tubes Oval / elliptical SS 304 / 316
Designer Frameworks Custom shapes Stainless steel
Handrails & Rails Decorative finishes 304/316 polished

 F. OEM & CUSTOM MACHINE BUILDERS

Application Description Alloys
Automation Construction Non-standard shapes SS / MS
Conveyors Tubular frames SS 304/316
Robotics & CNC Machinery Precision tubes SS 316L / Aluminium

SIZE RANGE & CUSTOM SHAPE CAPABILITIES

 STANDARD SIZE RANGE

Parameter Specification
Outside Diameter (OD) 6 mm – 1200 mm (Custom OD available)
Wall Thickness (WT) 0.5 mm – 12 mm
Length 1–12 meters (fabricated lengths available)
Shape Options Round • Square • Rectangle • Oval • Elliptical • Custom profiles
Tolerances As per EN 10219 / ASTM A554 or client-specific

SURFACE FINISH OPTIONS (ACROSS MATERIALS)

Finish Ra / Grit Application
2B Mill finish General purpose
BA Bright Annealed Pharma / Food
180–240 Grit Polished Architecture
320–400 Grit Polished Precision machinery / OEM
600 Grit High gloss Aesthetic / equipment
Mirror Polish <0.2 Ra Decorative / premium
Pickled / Passivated — Corrosion resistance

PRICE LIST (Indicative 2025 – INR & USD)

Alloy / Type Price (INR/kg) Price (USD/kg) Notes
SS 304/304L Fabricated ₹ 260 – ₹ 340 $3.25 – $4.20 Standard fabrication
SS 316/316L Tubes ₹ 330 – ₹ 420 $4.10 – $5.25 Pharma / food grade
Duplex (S31803/S32205) ₹ 480 – ₹ 650 $6.25 – $8.25 High-strength
Inconel 600/625 ₹ 2,100 – ₹ 3,200 $26 – $40 High-temp alloy
Hastelloy C22/C276 ₹ 2,800 – ₹ 4,200 $35 – $55 Corrosion-proof
Copper-Nickel 90/10 ₹ 950 – ₹ 1,350 $12 – $16 Marine applications

Final price depends on alloy, WT, welding method & finish.

HSN CODE

  • 7306.40.00 — Stainless Steel & Alloy Welded Tubes.

TESTING & QUALITY ASSURANCE

MANDATORY TESTS

  • Visual Inspection
  • Dimensional Tolerance Check
  • Hydro / Pneumatic Test
  • Weld seam integrity check
  • Surface finish inspection

ADVANCED TESTS

  • UT (Ultrasonic) & RT/X-ray
  • Dye Penetrant (DPT)
  • Eddy Current Test
  • Ferrite Testing (SS/Duplex)

MATERIAL EVALUATION

  • PMI identification
  • IGC Test (ASTM A262)
  • Tensile / Hardness test
  • Flattening & Flaring

Documentation: EN 10204 3.1 / 3.2, Weld map, PWHT report, Surface report.

Why Choose INOX STEEL INDIA for Fabricated Welded Tubes?

  1. Full Customisation: Custom OD from 6 mm to 1200 mm in round, rectangular, square, oval, elliptical & custom shapes with variable wall thickness.
  2. Multi-Weld Capability: TIG, Laser, Plasma, MIG, and Orbital Welding options based on project requirements.
  3. Alloy Expertise: Stainless Steel, Duplex, Super Duplex, Titanium, Nickel Alloys (Inconel, Monel, Hastelloy), Cu-Ni, and Aluminium.
  4. OEM Engineering: Delivering straight tubes or fully fabricated assemblies for heat exchangers, marine systems, and structural frames.
  5. Premium Finish: Full-penetration welds with ground & polished seams, passivation & pickling. Mirror or satin finish available.
  6. Traceability & TPI: 3.1 / 3.2 certification, heat number traceability, WPS/PQR, and TPI (SGS, TUV, Lloyds, DNV).

Fabricated Welded Tube Manufacturer in Mumbai & Gujarat – INOX STEEL INDIA

INOX STEEL INDIA appears as a preferred manufacturer because of our central location (near Alankar Cinema, Mumbai), quick supply network across Mumbai, Navi Mumbai, Thane, Gujarat, Pune, Delhi, and ability to deliver both prototype & bulk production.

Industries We Serve

Industry Applications Alloys
Pharma & Food Hygienic manifolds, equipment parts 304L / 316L
Chemical & Petrochemical Corrosive handling tubes Duplex • Hastelloy • Nickel Alloys
Marine & Offshore Seawater circulation & structure Cu-Ni • Duplex • Super Duplex
HVAC & Heat Transfer Headers, coils, manifolds SS 316L • Titanium
Aerospace & Defence Precision tubes Titanium, Nickel Alloys
Architecture / Furniture Custom shapes & finishes SS 304/316
OEM Machinery Conveyor frames, robotic arms SS / CS / Aluminium

Packaging & Export Readiness

PACKAGING

  • HDPE / LDPE wrapping and tube end caps.
  • Anti-scratch films and Foam separators.
  • Wooden crates and Desiccant bags.
  • Anti-corrosion vapour film (VCI).

EXPORT DOCUMENTATION

  • Commercial Invoice & Packing List.
  • EN 10204 – 3.1 / 3.2 MTC.
  • Certificate of Origin & TPI reports.
  • WPS/PQR & weld map.

Exports to: UAE • Saudi Arabia • Kuwait • Qatar • Oman • Singapore • South Africa • UK • USA • Germany • Malaysia • Indonesia.

Contact INOX STEEL INDIA

For custom OD, precision-shaped, or special-alloy welded tubes — choose India’s trusted manufacturer.

Inox Steel India

52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004

Email

alloy@inoxsteelindia.in, steel@inoxsteelindia.in

Phone

+91 9930796690

Frequently Asked Questions

Yes — we manufacture ANY OD from 6 mm to 1200 mm, and we work with stainless, duplex, nickel alloys, titanium, copper-nickel & aluminium.

TIG, MIG, Plasma, Laser, and Orbital welding — depending on thickness, alloy, and application.

Yes, up to 600-grit and full mirror finish.

Yes — we offer headers, manifolds, coils, frames, collars, elbows, fabricated bends.

Yes — regular exports to GCC, Europe, USA, Africa, and Southeast Asia.

INOX STEEL INDIA manufactures custom fabricated welded tubes in stainless steel, duplex, super duplex, nickel alloys, titanium & Cu-Ni. Custom OD 6 mm–1200 mm, TIG/laser/plasma welded, polished or mirror finish. Supplier in Mumbai & Gujarat. Exporter to GCC, EU & USA.

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