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Girgaon, Mumbai - 400004
Duplex Steel Welded Pipes Manufacturer & Stockist in India (Since 1984)
Trusted Global Manufacturer & Stockist of Duplex Steel Welded Pipes
Kamal Steels is a leading Duplex Steel Welded Pipes Manufacturer & Stockist in India, supplying high-quality Duplex Stainless Steel Welded Pipes for critical industrial applications worldwide. We manufacture and stock Duplex Steel Welded Pipes in grades UNS S31803, UNS S32205 and Super Duplex UNS S32750 in accordance with ASTM A790, ASTM A928, ASTM A312 and ASME SA790 specifications.
Our Duplex Steel Welded Pipes are produced using premium quality duplex stainless steel plates and coils with advanced welding processes to ensure superior strength, dimensional accuracy and corrosion resistance. These pipes are widely used in offshore platforms, oil & gas pipelines, petrochemical plants, marine applications, chemical processing industries, desalination plants, pulp & paper mills and power generation facilities.
As a trusted Duplex Steel Welded Pipe Manufacturer and Stockist, we maintain a ready inventory of welded pipes in various sizes, schedules and wall thicknesses for immediate delivery across India and global markets. Our welded pipes offer excellent resistance to chloride stress corrosion cracking, pitting corrosion and harsh operating environments while providing a cost-effective alternative to seamless pipes for many applications.
Get Quote / Best Price for Duplex Steel Welded Pipes
- Instant Quotation Support (Fast Response)
- WhatsApp Inquiry Available
- UNS S31803, UNS S32205 & S32750 Welded Pipes in Stock
- Bulk Order & Project Pricing
- Mill Test Certificate (MTC) Available
- Third Party Inspection (TPI) Support
- ASTM A790 & ASTM A928 Compliance
- 100% Weld Integrity & Quality Assurance
- Export Documentation Support
- Ready Stock Dispatch Worldwide
- Custom Length Cutting Available
- Project Supply for Oil & Gas, Petrochemical & Marine Industries
Certifications & Compliance
- ISO 9001:2015 Certified
- ISO 14001 Certified
- ISO 45001 Certified
- PED Approved Materials
- MSME Registered Company
- IEC Export Certification
- GST Registered Business
Why Duplex Steel Welded Pipes?
Duplex Steel Welded Pipes are known for their high strength, excellent corrosion resistance and superior resistance to chloride stress corrosion cracking. These pipes combine the properties of ferritic and austenitic stainless steels, making them suitable for aggressive industrial environments.
Duplex Steel Welded Pipes are widely used in applications requiring high mechanical strength, pressure handling capability and resistance against pitting and crevice corrosion.
Duplex Steel Welded Pipe Price in India
Kamal Steels offers competitive Duplex Steel Welded Pipe Price solutions for domestic and international customers. We supply Duplex and Super Duplex Welded Pipes in various grades, sizes, schedules and specifications at industry-leading prices with ready stock availability.
Looking for the latest Duplex Welded Pipe Price Per Kg or Duplex Steel Welded Pipe quotation? Our sales team provides customized pricing based on pipe dimensions, quantity, grade, testing requirements and delivery destination.
Factors Affecting Duplex Steel Welded Pipe Price
- Duplex Grade (UNS S31803, UNS S32205, S32750, S32760)
- Pipe Size & Outside Diameter (OD)
- Wall Thickness & Schedule
- Length Requirements
- Order Quantity
- Testing & Inspection Requirements
- Surface Finish Requirements
- Raw Material Market Rates
- Export Packaging Requirements
- Delivery Location
Duplex Steel Welded Pipe Price Information
- Duplex Steel Welded Pipe Price
- Duplex Welded Pipe Price Per Kg
- UNS S31803 Welded Pipe Price
- UNS S32205 Welded Pipe Price
- Super Duplex S32750 Welded Pipe Price
- Duplex Steel Welded Pipe Price
For the latest Duplex Steel Welded Pipe Price in India, contact Kamal Steels today. We offer instant quotations, bulk order pricing, project discounts, MTC documentation and worldwide delivery support.
Duplex Steel Welded Pipe Size Chart & Dimensions
Need a specific size or schedule? Contact our sales team for stock availability and project pricing.
Why Global Buyers Trust Kamal Steels?
- Manufacturer & Stockist Since 1984
- Large Ready Stock Available
- ASTM & ASME Standard Pipes
- Third Party Inspection
- Mill Test Certificates Provided
- PAN India & Export Supply
- Competitive Prices
- Fast Delivery Support
Duplex Steel Welded Pipe Specifications
| Product Name | Duplex Steel Welded Pipes |
|---|---|
| Manufacturer | Kamal Steels |
| Material | Duplex Stainless Steel |
| Pipe Type | Welded, ERW, EFW Pipes |
| Grades | UNS S31803, UNS S32205, UNS S32750, UNS S32760 |
| Size Range | 1/8" NB to 24" NB |
| Outer Diameter | 6.35 mm OD to 610 mm OD |
| Wall Thickness | 0.5 mm to 25 mm |
| Pipe Schedules | SCH 5, SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, SCH XXS |
| Length | Single Random, Double Random, Cut Length, Custom Length |
| Pipe Ends | Plain End, Beveled End, Threaded End |
| Surface Finish | Annealed & Pickled (AP), Polished, Bright Annealed (BA) |
| Standards | ASTM A790, ASTM A928, ASME SA790 |
| Testing | Hydrostatic Test, PMI Test, Flattening Test, Eddy Current Test, IGC Test |
| Certification | EN 10204 3.1, Mill Test Certificate (MTC), Third Party Inspection (TPI) |
| Applications | Oil & Gas, Petrochemical, Offshore, Marine, Power Plants, Heat Exchangers, Chemical Processing |
| Supply Condition | Ready Stock, Custom Manufacturing, Export Supply |
Available Grades of Duplex Steel Welded Pipes
Kamal Steels manufactures the following grades of stainless steel seamless pipes:
Duplex Steel Welded Pipe Manufacturing Process
Understanding the Duplex Steel Welded Pipe Manufacturing Process
Duplex steel welded pipes are manufactured using high-quality duplex steel plates or coils through a forming and welding process. The material is shaped into a pipe form and then welded using advanced welding techniques such as ERW or SAW, ensuring strong and reliable joints. Unlike seamless pipes, welded pipes are produced with a longitudinal weld seam, offering cost-effective solutions for a wide range of industrial applications.
| Step 1 |
Raw Material Selection Premium quality duplex steel coils and plates are selected according to the required grade and application. |
|---|---|
| Step 2 |
Forming Process The duplex steel material is formed into a cylindrical pipe shape using advanced forming machines. |
| Step 3 |
Welding Process High-quality welding techniques are used to join the edges and create a strong welded seam. |
| Step 4 |
Heat Treatment The welded pipes undergo solution annealing to improve corrosion resistance and mechanical properties. |
| Step 5 |
Sizing & Straightening Pipes are accurately sized and straightened using precision equipment. |
| Step 6 |
Testing & Inspection Hydrostatic testing, PMI testing and ultrasonic testing are performed. |
| Step 7 |
Finishing & Packaging The finished pipes are cleaned, marked and packed securely. |
Chemical Composition of Duplex Steel Welded Pipe
| Grade | Chromium (Cr) % | Nickel (Ni) % | Molybdenum (Mo) % | Nitrogen (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 |
| UNS S32760 | 24.0 – 26.0 | 6.0 – 8.0 | 3.0 – 4.0 | 0.20 – 0.30 |
Duplex Steel Welded Pipe Standards
| Standard | Description |
|---|---|
| ASTM A790 | Seamless and Welded Ferritic/Austenitic Duplex Stainless Steel Pipe |
| ASTM A928 | Ferritic/Austenitic Duplex Stainless Steel Welded Pipe with Filler Metal |
| ASME SA790 | ASME Equivalent of ASTM A790 |
| ASME SA928 | ASME Equivalent of ASTM A928 |
Mechanical Properties of Duplex Steel Welded Pipes
Tensile Strength
Tensile strength indicates how much stress the welded pipe can withstand before breaking. Duplex steel welded pipes provide reliable tensile performance for industrial and structural applications.
Yield Strength
Yield strength shows the stress level at which the pipe 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 pipes. 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 Pipes
- Excellent Corrosion Resistance: Duplex steel welded pipes provide excellent resistance against corrosion, pitting and chloride stress corrosion cracking, making them suitable for aggressive industrial and marine environments.
- High Strength: These pipes offer higher mechanical strength compared to standard stainless steel pipes, 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 pipes ensure long service life and reliable industrial performance.
- Good Weldability: Duplex steel welded pipes support easy fabrication and welding for industrial piping 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: Stainless steel seamless pipes 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 pipes are designed to withstand demanding pressure and temperature conditions in critical industrial operations.
- Low Maintenance Requirements: Due to their superior corrosion resistance and strength, duplex steel welded pipes require minimal maintenance during service.
Advantages of Duplex Steel Welded Pipes
Duplex Steel Welded Pipes provide an excellent combination of high strength, corrosion resistance and cost-effectiveness. Manufactured using advanced welding technology, these pipes are widely used in offshore, marine, chemical processing and industrial piping systems where durability and reliability are essential.
- Excellent resistance to pitting and crevice corrosion
- Superior resistance to chloride stress corrosion cracking
- Higher mechanical strength than conventional stainless steel pipes
- Cost-effective alternative to seamless pipes for many applications
- Available in larger diameters and custom lengths
- Good weldability and fabrication characteristics
- Suitable for high-pressure and corrosive environments
- Excellent dimensional accuracy and surface finish
- Reduced maintenance and operational costs
- Long service life in marine, offshore and chemical industries
Duplex Steel Welded Pipe vs Stainless Steel Welded Pipe
Duplex Steel Welded Pipes offer higher strength and superior corrosion resistance compared to conventional Stainless Steel Welded Pipes. They are preferred for aggressive industrial environments where reliability and long service life are critical.
| Property | Duplex Steel Welded Pipe | Stainless Steel Welded Pipe |
|---|---|---|
| Strength | Higher | Moderate |
| Corrosion Resistance | Excellent | Good |
| Chloride Resistance | Excellent | Moderate |
| Stress Corrosion Cracking Resistance | Excellent | Lower |
| Pressure Handling Capability | Higher | Standard |
| Marine Applications | Highly Suitable | Limited |
| Service Life | Longer | Standard |
| Cost | More Economical than Duplex Seamless Pipes | Lower Initial Cost |
Duplex Steel Welded Pipes are commonly selected for industrial projects requiring excellent corrosion resistance, high strength and cost-effective piping solutions.
Duplex Steel Welded Pipe Testing Methods
All Duplex Steel Welded Pipes supplied by Kamal Steels undergo stringent quality control procedures and inspection processes to ensure compliance with ASTM, ASME and international quality standards.
| Testing Method | Purpose |
|---|---|
| Hydrostatic Testing | Verifies pressure handling capability and leak resistance |
| Ultrasonic Testing (UT) | Detects internal defects and weld discontinuities |
| PMI Testing | Confirms chemical composition and material grade |
| Flattening Test | Checks ductility and resistance to cracking |
| Flaring Test | Evaluates expansion and forming capability |
| Eddy Current Testing | Detects surface and near-surface defects in welded pipes |
| Intergranular Corrosion Test | Verifies corrosion resistance performance |
| Visual Inspection | Checks weld quality, dimensions and surface finish |
| Third Party Inspection (TPI) | Independent verification of product quality and compliance |
Mill Test Certificates (MTC) as per EN 10204 3.1 and Third-Party Inspection (TPI) reports can be provided with every supply upon customer request.
Get Instant Quote NowApplications of Duplex Steel Welded pipes
Duplex steel welded pipes 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 piping applications.
Heat Exchangers
Preferred for heat exchanger systems because of their smooth finish and temperature resistance properties.
Boilers
These pipes 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 piping 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 piping 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 pipes & tubes to various industries worldwide for high-pressure and corrosion-resistant applications.
Refineries
Our duplex steel welded pipes are widely used in refinery applications for transporting high-pressure fluids and chemicals safely.
Fertilizer Plants
Fertilizer industries require corrosion-resistant piping systems for chemical processing and industrial operations.
Cement Plants
These welded pipes are suitable for cement plants for demanding cement manufacturing and material handling systems.
Engineering Industry
Engineering sectors use stainless steel seamless pipes for fabrication and industrial piping systems.
Offshore Industry
Offshore applications require durable and corrosion-resistant piping solutions for marine environments.
Automobile Industry
Automobile industries use welded pipes in exhaust systems and industrial fluid transportation applications.
Packaging, Testing & Inspection
Packaging
- Wooden Boxes: Duplex steel welded pipes are packed securely in wooden boxes to prevent damage during transportation and export handling.
- Bundles Packing: Pipes are bundled properly for easy loading, unloading and safe storage during shipment.
- Plastic End Caps: Plastic caps are provided on pipe 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 pipe can withstand high internal pressure without leakage or failure.
- Ultrasonic Testing: Detects internal defects and confirms structural integrity of duplex steel welded pipes.
- PMI Testing: Positive Material Identification verifies the chemical composition and material grade accuracy.
- Flattening Test: Checks pipe flexibility and resistance to cracking under deformation conditions.
- Flaring Test: Evaluates pipe 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
Duplex Steel Welded Pipes are manufactured by forming duplex stainless steel plates or coils into a tubular shape and welding the longitudinal seam. These pipes offer excellent corrosion resistance, high strength and reliable performance in demanding industrial applications.
Duplex Steel Welded Pipes are widely used in oil & gas, petrochemical, chemical processing, desalination plants, offshore platforms, marine systems, power generation facilities and water treatment applications.
Kamal Steels supplies Duplex Steel Welded Pipes in grades UNS S31803, UNS S32205, Super Duplex UNS S32750 and Super Duplex UNS S32760 according to international ASTM and ASME specifications.
ASTM A928 is a standard specification covering electric-fusion welded duplex stainless steel pipes intended for corrosive environments and high-strength industrial applications. ASTM A928 Duplex Pipes are commonly used in offshore, marine and chemical processing industries.
UNS S31803 is a duplex stainless steel grade containing chromium, nickel and molybdenum, providing excellent corrosion resistance, high mechanical strength and resistance to chloride stress corrosion cracking.
UNS S32205 is an enhanced duplex stainless steel grade with improved corrosion resistance and higher nitrogen content. It is widely used in chemical processing, offshore, marine and pressure piping applications.
Super Duplex Welded Pipes contain higher levels of chromium, molybdenum and nitrogen compared to standard Duplex Pipes. This provides greater strength, improved pitting resistance and superior corrosion resistance in highly aggressive environments.
Duplex Steel Welded Pipes are available in sizes ranging from 6 mm to 610 mm outer diameter with various wall thicknesses and schedules including SCH 10, SCH 40, SCH 80, SCH 160 and SCH XXS.
Duplex Steel Welded Pipe Price in India depends on grade, size, wall thickness, quantity, testing requirements and market conditions. Contact Kamal Steels for the latest Duplex Pipe Price Per Kg and project quotations.
Yes, Kamal Steels supplies Duplex Steel Welded Pipes with Mill Test Certificates (MTC) as per EN 10204 3.1 and can arrange Third-Party Inspection (TPI) from approved inspection agencies upon customer request.