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Girgaon, Mumbai - 400004
Duplex Steel Seamless Pipes Manufacturer in India
What are Duplex Steel Seamless Pipes?
Duplex Steel Seamless Pipes are stainless steel pipes with a duplex microstructure containing both austenitic and ferritic phases. This balanced structure provides a combination of good corrosion resistance, high mechanical strength and resistance to localized corrosion. Duplex stainless steel is widely selected for demanding piping applications where both strength and corrosion resistance are important.
Manufactured without a longitudinal weld seam, Duplex Steel Seamless Pipes provide uniform construction and reliable performance in pressure and process piping systems. They are available in different outside diameters, wall thicknesses, schedules and lengths according to applicable standards and project requirements. Common duplex grades include UNS S31803 and UNS S32205, while higher-alloy grades are available for more demanding corrosive environments.
Duplex Steel Seamless Pipes are used in oil and gas, petrochemical, chemical processing, marine, power generation, desalination and other industrial applications. Their combination of strength and corrosion resistance can make them suitable for systems exposed to chloride environments, pressure and demanding operating conditions.
Kamal Steels is a Duplex Steel Seamless Pipes Manufacturer & Stockist in India, supplying Duplex Steel Seamless Pipes in standard and customized sizes, schedules, wall thicknesses and lengths. Products can be supplied with applicable testing, inspection, material certificates and documentation according to customer and project specifications.
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Certifications & Compliance
Kamal Steels adheres to internationally recognized quality standards and industry regulations, ensuring reliable manufacturing, consistent product quality, and compliance with global export requirements.
- ISO 9001:2015 Certified
- ISO 14001 Certified
- ISO 45001 Certified
- PED Approved Materials
- MSME Registered Company
- IEC Export Certification
- GST Registered Business
- EN 10204 3.1 Material Test Certificate
Duplex Steel Seamless Pipe Specifications
| Product Name | Duplex Steel Seamless Pipes |
|---|---|
| Brand | Kamal Steels |
| Material | Duplex Steel |
| Type | Seamless Pipe |
| Grades | UNS S31803, S32205, S32750 |
| Outer Diameter | 6 mm to 610 mm |
| Wall Thickness | 1 mm to 40 mm |
| Length | Single Random, Double Random, Cut Length |
| Pipe End | Plain End, Beveled End, Threaded End |
| Surface Finish | Annealed, Pickled, Polished |
| Standards | ASTM A790, ASTM A928, ASME SA790 |
| Pipe Schedules | SCH 10 to SCH XXS |
Duplex Steel Seamless Pipe Size Chart & Dimensions
Available Grades of Duplex Steel Seamless Pipes
Kamal Steels manufactures the following grades of Duplex Steel Seamless Pipes:
Duplex Steel Pipe vs Stainless Steel Pipe
The difference between Duplex Steel Pipes and conventional Stainless Steel Pipes primarily lies in strength, corrosion resistance and suitability for aggressive industrial environments. Duplex grades combine ferritic and austenitic structures, providing enhanced mechanical and corrosion-resistant properties.
| Property | Duplex Steel Pipe | Stainless Steel 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 | Higher Initial Cost | Lower Initial Cost |
Custom sizes, wall thicknesses and cut lengths can be supplied based on project specifications and application requirements.
Features of Duplex Steel Seamless Pipes
- Excellent Corrosion Resistance: Duplex steel seamless pipes offer excellent resistance against chloride stress corrosion, rust, chemicals and moisture, making them ideal for marine and aggressive industrial environments.
- High Temperature Strength: These pipes provide significantly higher strength compared to standard duplex steel, allowing them to perform efficiently under high pressure and heavy load conditions.
- Superior Durability: Manufactured without welding joints, duplex seamless pipes ensure excellent mechanical strength, toughness and long service life.
- Leak-Proof Construction: The seamless structure reduces leakage risks and ensures reliable performance in critical fluid and gas transportation systems.
- Smooth Surface Finish: Smooth internal and external surfaces improve flow efficiency and reduce scaling, friction and contamination.
- High Pressure Handling Capability: Designed to withstand high internal pressure, making them suitable for demanding industrial operations.
- Accurate Dimensions: Precision manufacturing ensures uniform wall thickness, tight tolerances and easy installation.
- Easy Fabrication and Welding: Duplex steel seamless pipes can be easily cut, bent, fabricated and welded as per project requirements.
- Long Service Life: Excellent resistance to corrosion and wear ensures long-term performance even in harsh environments.
- Low Maintenance Requirements: Requires minimal maintenance due to strong corrosion resistance and structural stability.
Duplex Steel Pipe Testing Methods
All Duplex Steel Seamless Pipes supplied by Kamal Steels undergo strict quality control procedures and testing methods 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 discontinuities |
| PMI Testing | Confirms chemical composition and material grade |
| Flattening Test | Checks ductility and resistance to cracking |
| Flaring Test | Evaluates expansion and forming capability |
| Intergranular Corrosion Test | Verifies corrosion resistance performance |
| Visual Inspection | Checks dimensions, finish and workmanship |
| Third Party Inspection (TPI) | Independent verification of product quality |
Mill Test Certificates (MTC) as per EN 10204 3.1 and Third-Party Inspection reports can be provided upon request with every supply.
Chemical Composition of Duplex Steel Seamless Pipe
The chemical composition of Duplex Steel grades plays a major role in corrosion resistance, mechanical strength and resistance to chloride stress corrosion cracking. Grades UNS S31803, UNS S32205 and Super Duplex UNS S32750 are widely used in offshore, marine, petrochemical and chemical processing industries.
| 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 |
Mechanical Properties of Duplex Steel Seamless Pipes
Tensile Strength
Tensile strength indicates how much stress the Duplex Steel Seamless Pipe can withstand before breaking. Duplex Steel Seamless Pipes provide reliable tensile performance for structural and industrial piping 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 Seamless Pipes. Higher elongation allows easier fabrication, bending and installation.
| Grade | Tensile Strength (MPa, min) | Yield Strength (MPa, min) | Elongation (%) |
|---|---|---|---|
| UNS S31803 | 620 | 450 | 25% |
| UNS S32205 | 655 | 450 | 25% |
| UNS S32750 | 800 | 550 | 15% |
Applications of Duplex Steel Seamless Pipes
Duplex steel seamless pipes are widely used in industries where high strength, corrosion resistance and pressure handling capability are required.
Oil & Gas Industry
Used for offshore and onshore pipelines, transporting oil, gas and high-pressure fluids safely and efficiently.
Petrochemical Industry
Ideal for handling aggressive chemicals and high-temperature processing systems.
Chemical Processing Plants
Used in chemical industries requiring strong corrosion resistance and durability.
Power Generation Plants
Suitable for steam lines, heat transfer systems and high-pressure applications.
Heat Exchangers
Preferred for efficient heat transfer due to excellent thermal and corrosion resistance properties.
Boilers
Used in high-pressure boiler systems operating under extreme temperature conditions.
Water Treatment Plants
Ideal for desalination and water treatment systems due to corrosion resistance and hygiene.
Pharmaceutical Industry
Used in clean and contamination-free piping systems for critical applications.
Food Processing Industry
Suitable for hygienic processing environments requiring clean surfaces and durability.
Marine Industry
Highly resistant to seawater corrosion, making them ideal for shipbuilding and offshore structures.
Construction Industry
Used in structural and industrial piping applications for strength and durability.
Industries Using Duplex Steel Seamless Pipes
Kamal Steels supplies duplex steel seamless pipes & tubes to various industries worldwide for high-pressure and corrosion-resistant applications.
Refineries
Used for safe transportation of oil, gas and chemical fluids under extreme conditions.
Fertilizer Plants
Suitable for handling corrosive chemicals and industrial processing systems.
Cement Plants
Used in heavy-duty industrial and material handling systems.
Engineering Industry
Widely used for fabrication and mechanical engineering applications.
Offshore Industry
Ideal for marine and offshore structures exposed to seawater environments.
Automobile Industry
Used in exhaust systems and fluid handling applications.
Frequently Asked Questions
Duplex Steel Seamless Pipes are manufactured without welded joints using duplex stainless steel grades. These pipes provide excellent corrosion resistance, high mechanical strength and superior durability for demanding industrial applications.
Duplex Steel Seamless Pipes are widely used in oil & gas, offshore platforms, petrochemical plants, marine systems, desalination plants, chemical processing facilities and power generation projects.
We supply Duplex Steel Seamless Pipes in grades UNS S31803, UNS S32205 and Super Duplex UNS S32750 according to ASTM and ASME specifications.
ASTM A790 is the standard specification covering seamless and welded ferritic/austenitic stainless steel pipes, commonly known as Duplex Stainless Steel Pipes, for general corrosion-resistant and high-temperature service applications.
UNS S31803 is a Duplex Stainless Steel grade offering excellent strength, corrosion resistance and resistance to chloride stress corrosion cracking. It is widely used in chemical, marine and offshore applications.
UNS S32205 is an enhanced Duplex Stainless Steel grade with improved corrosion resistance and mechanical properties. It is one of the most commonly used Duplex Pipe grades worldwide.
Super Duplex Pipes contain higher chromium, molybdenum and nitrogen content than standard Duplex Pipes, providing greater strength and improved resistance to pitting, crevice corrosion and chloride attack.
Duplex Steel Seamless Pipes are available in sizes ranging from 6 mm to 610 mm outer diameter with multiple wall thicknesses and schedules including SCH 10, SCH 40, SCH 80 and SCH XXS.
Duplex Steel Seamless Pipe Price depends on grade, size, schedule, quantity, testing requirements and delivery location. Contact Kamal Steels for the latest Duplex Pipe Price and stock availability.
Yes, all Duplex Steel Seamless Pipes can be supplied with Mill Test Certificates (MTC) as per EN 10204 3.1 and Third-Party Inspection (TPI) reports from approved inspection agencies upon request.