info@rnatubes.com

+91 90999 27707

GIDC Industrial Estate, Ahmedabad, Gujarat, India

Industrial Excellence Since 1994

Carbon & Stainless Steel
Seamless Tubes & Pipes

Leading manufacturer and exporter in India of premium boiler assemblies, feedwater heating tubes, and passivated lines for critical global sectors.

48,000+MT Annual Capacity
20+Export Countries
30+Years Experience
Advanced Manufacturing Process

Cold Drawing &
High-Reduction Pilger Mill

Equipped with online finishing systems conforming to global ASTM, ASME, and DIN standards. Sized from 3mm up to 180mm outer diameter.

ASTM A312 / A213 / A269 Grade 304, 316, 321, Duplex 100% Hydro-tested
Zero Defect Integrity

100% NDT &
Hydrostatic Testing Laboratory

Continuous Eddy Current, ultrasonic verification, flattening, and chemical PMI spectrochemical tests ensure absolute safety in high-pressure steam pipes.

ISO 9001:2015 PED 2014/68/EU MTC EN 10204 3.1
RNA Tubes Stock Pipes

30+

Years Industry Experience

Pioneering Quality In Seamless Metallurgy

Welcome to RNA Tubes Private Limited, where quality meets innovation in the manufacturing of high-performance Carbon Steel and Stainless Steel Pipes & Tubes. With years of experience and a commitment to excellence, we pride ourselves on being a leading provider of premium steel products for a diverse range of engineering industries worldwide.

Our state-of-the-art facility is equipped with continuous drawing mills, bright hydrogen gas annealing chambers, and online testing benches. We manufacture seamless tubes engineered to endure the most challenging high-temperature, high-pressure, and acidic environments.

Unmatched Quality

Rigorous non-destructive testing ensures zero defect shipments on every batch.

Advanced Metallurgy

Production of high-nickel alloys, duplex, and super duplex steel grades.

Global Export Ready

Seaworthy packing with EN 10204 3.1 Mill Test Report on every shipment.

Contact Sales Team

30+

Years Experience

48,000+

MT Annual Capacity

400+

Skilled Technicians

20+

Exporting Countries

VISION

"To produce high-quality, cost & work efficient, easy to use products that incorporate high technology and serve critical global industries."

VALUES

"Do What We Speak & absolute Quality Consciousness across all raw materials, operations, and final delivery logistics."

MISSION

"To attract and attain customers with high-valued products and services and the most satisfying ownership experience in global steel metallurgy."

Our Products Range

Delivering High-Performance Tubes for Critical Industrial Applications

Boiler Tubes

Boiler Tubes

Conforming to ASTM A213 standards, these tubes are crafted for high-pressure boilers, superheaters, and steam lines. Exceptional thermal yield under aggressive stress.

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Heat Exchanger Tubes

Heat Exchanger Tubes

Designed specifically for superior heat transfer conductivity in refinery distillation chambers, steam condensers, and chemical cooling assemblies.

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U Bend Tubes

U-Bend Tubes

Bent to custom radius specifications and stress-relief annealed in the bend area to prevent stress corrosion. Available in lengths up to 30 Meters.

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Fin Tubes

Fin Tubes

Fitted with outer metallic fins to enhance surface area and improve thermal dissipation. Ideal for industrial air heat exchangers and high-performance radiators.

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Bright Annealed Tubes

Bright Annealed / Automobile

Precision drawing combined with protective hydrogen heat treatment yields a mirror-like finish, ideal for automotive fuel injections and brakes.

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Fuel Injection Tubes

Fuel Injection / Hydraulic

Specifically engineered to withstand extreme hydraulic pressures without deformation. High mechanical strength and corrosion threshold.

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Passivated Tubes

Passivated Tubes

Undergoes acid bath pickle cleaning and passivation, restoring the active chromium oxide layer for aggressive chemical and pharmaceutical pipelines.

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Stainless Steel Tubes and Pipes

Stainless Steel Tubes & Pipes

Seamless and welded standard piping arrays in grades TP304/L and TP316/L for fluid transportation and industrial infrastructure.

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Precision Pipes & Tubes Range

Designed to withstand extreme pressures, structural stress, and highly corrosive chemical environments.

Stainless Steel Seamless Pipes

Stainless Steel Seamless Pipes & Tubes

Manufactured by hot extrusion or cold drawing process to ensure high-pressure resilience and microstructural uniformity.

Outer Diameter6.00 mm to 219.10 mm
Wall Thickness0.50 mm to 20.00 mm
StandardsASTM A312, A213, A269, EN 10216-5
Steel GradesTP304/304L, TP316/316L, TP321, TP347, S31803 (Duplex), S32750 (Super Duplex)
ApplicationsRefineries, Chemical Plants, Oil & Gas Distribution, Fertilizers
Request Specification Sheet
Welded Stainless Steel Tubes

Welded Stainless Steel Tubes

Precision-welded from premium quality strips with online bead rolling, solution annealing, and eddy current testing.

Outer Diameter12.70 mm to 114.30 mm
Wall Thickness0.80 mm to 6.00 mm
StandardsASTM A249, A269, A554, EN 10217-7
Steel GradesTP304/304L, TP316/316L, TP316Ti
ApplicationsFood & Beverage, Decorative Structural, Condensers, General Engineering
Request Specification Sheet
Heat Exchanger U-Bend Tubes

Heat Exchanger & U-Bend Tubes

Specially manufactured straight tubes that are bent cold to precise radii and stress-relieved to avoid stress corrosion cracking.

Bending Radius1.5 x OD up to 1000 mm
Length LimitStraight length up to 30 Meters (pre-bending)
StandardsASTM A213, A688, A803
Testing CarriedEddy Current, Hydrostatic, Spherical ball passing test
ApplicationsBoilers, Condensers, Heat Exchangers, Radiators
Request Specification Sheet
Hydraulic & Instrumentation Tubes

Bright Annealed Hydraulic & Instrumentation Tubes

Precision cold-drawn tubes with bright hydrogen annealing to guarantee a scales-free, reflective, clean inner surface.

Outer Diameter3.18 mm to 25.40 mm
Wall Thickness0.50 mm to 2.11 mm
StandardsASTM A213 (AW), ASTM A269
Surface FinishBright Annealed (Ra < 0.4 microns)
ApplicationsHigh-pressure hydraulic circuits, aerospace fuel lines, gas chromatographs
Request Specification Sheet

Our Production Process

How premium round billets are transformed into structural high-performance tubes

1

Billet Heating & Rotary Piercing

Chemistry-verified solid round billets are heated to 1200°C in our hearth furnace, then immediately pierced with a center mandrel to form the initial hollow shell.

Rotary Piercing
2

Cold Drawing & Pilger Reduction

The hollow shells are lubricated and drawn through tungsten carbide dies or rolled in cold pilger mills to achieve precise wall thickness (WT) and outer diameter (OD) tolerances.

Cold Drawing
3

Bright Protective Annealing

Tubes are heat treated at 1050°C in a pure hydrogen atmosphere. Rapid cooling recrystallizes the steel, returning elasticity and maximum corrosion thresholds without oxidation scale.

Bright Annealing
4

NDT & Hydrostatic Pressure Bench

Every single tube is subjected to up to 300 bar hydrostatic pressure checks, online Eddy Current scans, and ultrasonic testing to catch inclusions or weld flaws.

Quality Inspection
5

Packing & Export Marking

Pipes are cleaned, passivated, and stencil-marked with standard, size, heat number, and grade details. Wrapped in protective sleeves and packed into seaworthy wooden crates for international transport.

Export Packing

Quality Assurance Plan

RNA Tubes enforces a zero-defect policy backed by an on-site laboratory. Our products conform to major international standards (ASTM, ASME, EN, DIN, ISO). Every batch is shipped with a certified Mill Test Report (MTR) according to EN 10204 3.1.

  • Hydrostatic Pressure Testing

    Every single pipe is pressurized up to 300 bar to ensure weld integrity and wall strength without leakages.

  • Non-Destructive Testing (NDT)

    On-line Eddy Current testing and Ultrasonic testing identify micro-cracks, inclusions, or sub-surface weld flaws automatically.

  • Mechanical Tests

    Tensile stress profiling, yield point verification, flaring, flattening, and hardness tests on every production batch.

  • Laboratory Chemical PMI Tests

    Spectrochemical analysis confirms exact chemical composition matching ASTM/ASME heat analysis requirements.

PED 2014/68/EU

Pressure Equipment Directive Compliance

ISO 9001:2015

Quality Management Systems Certification

NACE MR0175

Sulfide Stress Cracking Resistant Certification

MTC EN 10204 3.1

Accredited Mill Test Report on Every Batch

Third Party Inspection

Approved by SGS, TUV, Lloyd's Register & Bureau Veritas

ISO/IEC 17025

Accredited In-House Testing Laboratory

Quality Testing Lab

Why You Should Choose RNA Tubes

  • We take extreme care to maintain high quality unchanged in every batch of tubes.
  • We assure regular supply and prompt delivery to support your project timeline.
  • We are always committed to our clients and believe in long-term global associations.
  • We support customization to cater to each and every customer's thermal and pressure requirements.
  • Certified Mill Test Reports (EN 10204 3.1) issued with every delivery for complete traceability.

Download Product Brochure

Get detailed dimensional grids, scheduling lists, wall thickness charts, and chemical properties matching ASTM/ASME grades.

Download PDF Brochure

Technical Toolroom

SS Pipe Dimensions Visualizer & Weight Calculator

OD: 90.0 mm WT: 5.0 mm
Material Grade SS 304 / 316
Outer Diameter (OD) 90.0 mm
Wall Thickness (WT) 5.0 mm
Tube Length (Meters) 6.0 m
Weight (per Meter)
-- kg/m
Total Weight
-- kg

Contact Sales Team

Ready to request pricing, certifications, or custom bend drawings? Send details through the RFQ form. Our team responds with structured custom quotes within 24 hours.

Factory Works & Office

Plot No. 404-406, SG Business Hub Nr Santej-Gota Cross Road, Gota Overbridge, Ahmedabad, Gujarat 380060, India

Department Emails

Inquiries: info@rnatubes.com
Exports: export@rnatubes.com

Business Hours

Monday – Saturday: 9:00 AM – 6:00 PM
Sunday: Closed

Request For Quote (RFQ)

Configure custom sizes in the weight calculator above and add them directly into this RFQ bucket.

Configured Pipe Inquiry List:

RFQ successfully submitted! Our marketing team will contact you shortly with an MTR-matched quotation.