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Girgaon, Mumbai - 400004
Duplex Steel Welded Tubes Manufacturer in India
Duplex Steel Welded Tube Manufacturer in India
Kamal Steels is a leading Duplex Steel Welded Tubes Manufacturer, Supplier and Exporter in India, supplying high-quality duplex steel welded tubes and tubing for industrial, commercial and engineering applications. Established in 1984, we have decades of experience in stocking, supplying and exporting duplex steel tubing solutions to customers across domestic and international markets.
We maintain a large ready stock of Duplex Steel Welded Tubes in various grades, sizes, wall thicknesses and specifications to meet diverse industrial requirements. Our duplex welded tubes are widely used in oil & gas, petrochemical, chemical processing, power generation, marine, desalination, offshore and other demanding industries.
Our Duplex Steel Welded Tubes are sourced from approved manufacturers and are known for excellent corrosion resistance, good dimensional accuracy, high strength and long service life. All products are supplied in accordance with international ASTM, ASME and ANSI standards with strict quality control and testing procedures.
As trusted Duplex Steel Welded Tube Suppliers and Exporters in India, we provide tubes with precise dimensions, smooth finish and reliable performance for medium to high-pressure and corrosive environments. Our commitment to quality, ready stock availability, timely delivery, competitive pricing and customer satisfaction has made Kamal Steels a preferred choice in the duplex steel tubing industry since 1984.
Why Duplex Steel Welded Tubes?
Duplex Steel Welded Tubes are known for their high strength, excellent corrosion resistance and superior resistance to chloride stress corrosion cracking. These tubes combine the properties of ferritic and austenitic stainless steels, making them suitable for aggressive industrial environments.
Duplex Steel Welded Tubes are widely used in applications requiring high mechanical strength, pressure handling capability and resistance against pitting and crevice corrosion.
Why Choose Kamal Steels?
- Manufacturer & Stockist Since 1984
- Large Ready Stock Available
- ASTM & ASME Standard Tubes
- Third Party Inspection
- Mill Test Certificates Provided
- PAN India & Export Supply
- Competitive Prices
- Fast Delivery Support
Duplex Steel Welded Tube Specifications
| Product Name | Duplex Steel Welded Tubes |
|---|---|
| Brand | Kamal Steels |
| Material | Duplex Steel |
| Type | Welded Tube |
| Grades | UNS S31803, UNS S32205, UNS S32750, UNS S32760 |
| Outer Diameter | 6 mm to 219 mm |
| Wall Thickness | 0.5 mm to 12 mm |
| Length | Single Random, Double Random, Cut Length |
| Tube End | Plain End, Beveled End |
| Surface Finish | Annealed, Pickled, Polished, Bright Annealed |
| Standards | ASTM A789, ASTM A790, ASME SA789 |
| Tube Shapes | Round, Square, Rectangular |
Technical Overview
Our Duplex Steel Welded Tubes are manufactured for applications requiring excellent corrosion resistance, high mechanical strength and reliable dimensional accuracy. These tubes are produced using advanced welding processes and quality-controlled manufacturing techniques for dependable industrial performance.
Duplex Steel Welded Tubes provide superior resistance to chloride stress corrosion cracking, pitting and crevice corrosion, making them suitable for aggressive environments. They are widely used in offshore, marine, oil & gas, chemical processing, desalination, heat exchanger and structural applications.
Available Grades of Duplex Steel Welded Tubes
Kamal Steels manufactures the following grades of Duplex Steel Welded Tube:
Duplex Steel Welded Tube Manufacturing Process
Understanding the Duplex Steel Welded Tube Manufacturing Process
Duplex steel welded tubes are manufactured using high-quality duplex stainless steel coils or plates through advanced forming and welding processes. These tubes offer excellent corrosion resistance, high strength and superior dimensional accuracy for industrial applications.
| Step 1 |
Raw Material Selection High-quality duplex stainless steel coils or plates are selected according to ASTM standards, required grade, size and application requirements. |
|---|---|
| Step 2 |
Strip Uncoiling & Slitting The duplex steel coils are uncoiled and slit into the required strip width based on the specified tube dimensions. |
| Step 3 |
Tube Forming The strip passes through multiple forming rolls that gradually shape the material into a tubular form. |
| Step 4 |
Welding Process (HF/ERW) The formed strip edges are welded using High Frequency (HF) or Electric Resistance Welding (ERW) technology to create a strong and uniform weld seam. |
| Step 5 |
Sizing & Calibration The welded tube is passed through sizing rolls to achieve accurate diameter, wall thickness and dimensional consistency. |
| Step 6 |
Heat Treatment Tubes undergo solution annealing and rapid cooling to improve mechanical properties, corrosion resistance and weld integrity. |
| Step 7 |
Pickling & Surface Cleaning The tube surface is pickled to remove oxide scale, welding discoloration and impurities, ensuring a clean and smooth finish. |
| Step 8 |
Straightening & Cutting Tubes are straightened using precision machines and cut into required lengths according to customer specifications. |
| Step 9 |
Testing & Inspection Each welded tube undergoes hydrostatic testing, eddy current testing, ultrasonic testing, PMI testing, dimensional inspection and visual examination to ensure quality compliance. |
| Step 10 |
Marking, Packing & Dispatch Finished tubes are marked with grade, size and heat number, then securely packed in bundles or export packaging for safe transportation and dispatch. |
Chemical Composition of Duplex Steel Welded Tubes
The chemical composition of duplex steel welded tube grades plays an important role in corrosion resistance, mechanical strength and long-term industrial performance. Duplex grades provide superior resistance against chloride stress corrosion cracking, pitting and crevice corrosion.
| Grade | Cr % | Ni % | Mo % | N % |
|---|---|---|---|---|
| UNS S31803 | 21.0–23.0 | 4.5–6.5 | 2.5–3.5 | 0.08–0.20 |
| UNS S32205 | 22.0–23.0 | 4.5–6.5 | 3.0–3.5 | 0.14–0.20 |
| UNS S32750 | 24.0–26.0 | 6.0–8.0 | 3.0–5.0 | 0.24–0.32 |
Duplex Steel Welded Tube Size Chart & Dimensions
Duplex Steel Welded Tube Standards
| ASTM Standards | ASME Standards |
|---|---|
| ASTM A789 | ASME SA789 |
| ASTM A790 | ASME SA790 |
Mechanical Properties of Duplex Steel Welded Tubes
Tensile Strength
Tensile strength indicates how much stress the welded tube can withstand before breaking. Duplex steel welded tubes provide reliable tensile performance for industrial, structural and heat exchanger applications.
Yield Strength
Yield strength shows the stress level at which the tube starts permanent deformation. Good yield strength ensures safe performance in pressure and load-bearing applications.
Elongation
Elongation reflects the ductility and forming capability of duplex steel welded tubes. Higher elongation allows easier fabrication, bending and installation.
| Grade | Tensile Strength (MPa, min) | Yield Strength (MPa, min) | Elongation (% min) |
|---|---|---|---|
| UNS S31803 | 620 | 450 | 25% |
| UNS S32205 | 655 | 450 | 25% |
| UNS S32750 | 800 | 550 | 15% |
Features of Duplex Steel Welded Tubes
- Excellent Corrosion Resistance: Duplex steel welded tubes provide excellent resistance against corrosion, pitting and chloride stress corrosion cracking, making them suitable for aggressive industrial and marine environments.
- High Strength: These tubes offer higher mechanical strength compared to standard stainless steel tubes, allowing them to perform efficiently under high pressure and heavy-duty applications.
- Superior Durability: Manufactured using high-quality duplex steel material and advanced welding technology, these tubes ensure long service life and reliable industrial performance.
- Good Weldability: Duplex steel welded tubes support easy fabrication and welding for industrial tubing systems and structural applications.
- Excellent Pitting Resistance: The higher chromium and molybdenum content improves resistance against pitting and crevice corrosion in chloride-rich environments.
- High Pressure Handling Capability: Duplex steel welded tubes are designed to handle high internal pressure and heavy-duty industrial operations.
- Smooth Surface Finish: Smooth internal and external surfaces improve flow efficiency and reduce contamination, scaling and pressure loss.
- Suitable for High Pressure Applications: Duplex steel welded tubes are designed to withstand demanding pressure and temperature conditions in critical industrial operations.
- Accurate Dimensions: Precision manufacturing ensures uniform wall thickness and dimensional accuracy for reliable installation and performance.
- Low Maintenance Requirements: Due to their superior corrosion resistance and strength, duplex steel welded tubes require minimal maintenance during service.
Applications of Duplex Steel Welded Tubes
Duplex steel welded tubes are widely used in industrial applications where corrosion resistance, high strength and pressure handling capability are required.
Oil & Gas Industry
Used for transporting oil, gas and high-pressure fluids in offshore and onshore operations with reliable performance.
Petrochemical Industry
Widely used in petrochemical plants for handling corrosive chemicals and high-temperature processing systems.
Chemical Processing Plants
Suitable for industrial chemical processing applications requiring strong corrosion resistance and durability.
Power Generation Plants
Used in thermal and power generation systems for steam handling and high-temperature tubing applications.
Heat Exchangers
Preferred for heat exchanger systems because of their smooth finish and temperature resistance properties.
Boilers
These tubes are suitable for boiler systems operating under high pressure and demanding temperature conditions.
Water Treatment Plants
Used in desalination and water treatment systems because of their corrosion-resistant and hygienic properties.
Pharmaceutical Industry
Ideal for pharmaceutical applications requiring clean, contamination-free and durable tubing systems.
Food Processing Industry
Widely used in food and beverage industries due to hygienic surfaces and corrosion resistance performance.
Marine Industry
Marine environments require corrosion-resistant tubing systems capable of handling seawater exposure efficiently.
Construction Industry
Used in industrial and structural construction projects because of their strength and long service life.
Industries We Serve
Kamal Steels supplies duplex steel welded tubes to various industries worldwide for high-pressure and corrosion-resistant applications.
Refineries
Our duplex steel welded tubes are widely used in refinery applications for transporting high-pressure fluids and chemicals safely.
Fertilizer Plants
Fertilizer industries require corrosion-resistant tubing systems for chemical processing and industrial operations.
Cement Plants
These welded tubes are suitable for demanding cement manufacturing and material handling systems.
Engineering Industry
Engineering sectors use duplex steel welded tubes for fabrication and industrial tubing systems.
Offshore Industry
Offshore applications require durable and corrosion-resistant tubing solutions for marine environments.
Automobile Industry
Automobile industries use welded tubes in exhaust systems and industrial fluid transportation applications.
Packaging, Testing & Inspection
Packaging
- Wooden Boxes: Duplex steel welded tubes are packed securely in wooden boxes to prevent damage during transportation and export handling.
- Bundles Packing: Tubes are bundled properly for easy loading, unloading and safe storage during shipment.
- Plastic End Caps: Plastic caps are provided on tube ends to protect against dust, moisture and external damage.
- Export Standard Packaging: All products are packed according to international export standards for safe worldwide delivery.
- Bubble Wrap Protection: Bubble wrapping provides additional surface protection during transportation and material handling.
Testing & Inspection
- Hydrostatic Testing: Ensures the tube can withstand high internal pressure without leakage or failure.
- Eddy Current Testing: Detects weld seam and surface defects to ensure the structural integrity of duplex steel welded tubes.
- PMI Testing: Positive Material Identification verifies the chemical composition and material grade accuracy.
- Flattening Test: Checks tube flexibility and resistance to cracking under deformation conditions.
- Flaring Test: Evaluates tube expansion capability and forming performance for fabrication applications.
- Intergranular Corrosion Test: Confirms corrosion resistance performance in aggressive industrial environments.
- Third Party Inspection: Independent inspection agencies verify quality, dimensions and testing compliance.
Frequently Asked Questions
Kamal Steels is a leading duplex steel welded tube manufacturer in India supplying high-quality duplex stainless steel welded tubing for industrial and engineering applications.
A duplex steel welded tube is manufactured by forming duplex stainless steel strips into a tubular shape and welding the seam using advanced welding processes.
We supply Duplex 2205, Super Duplex 2507, UNS S31803 and UNS S32750 welded tubes.
These tubes are widely used in offshore, marine, desalination, oil & gas and chemical processing industries.
Our duplex steel welded tubes are manufactured according to ASTM A789, ASTM A790 and ASME standards.
We offer duplex welded tubing in different diameters, wall thicknesses and custom specifications.
We perform hydro testing, eddy current testing, PMI testing and third-party inspections.
Duplex stainless steel welded tubes provide higher strength and superior corrosion resistance compared to conventional stainless steel tubing.
Yes, we supply Super Duplex 2507 welded tubes for highly corrosive and offshore applications.
You can request a quote by sharing your grade, tube size, quantity and application details with our sales team.