Manufacturers and suppliers of UNS S31803 Stainless Steel Seamless Hydraulic & Instrumentation Tubes (Duplex 2205), designed for demanding service conditions in offshore platforms, chemical processing, oil & gas facilities, marine systems, and power generation plants.
Our UNS S31803 Stainless Steel Seamless Hydraulic & Instrumentation Tubes (Duplex 2205)
are manufactured from a high-performance duplex stainless steel grade that delivers an
optimal balance of superior mechanical strength and outstanding corrosion resistance.
The dual-phase austenitic-ferritic microstructure provides excellent resistance to
stress corrosion cracking, pitting, and crevice corrosion, making these tubes highly
suitable for harsh and aggressive service environments.
The seamless, precision-engineered construction ensures consistent wall thickness and
smooth internal bore surfaces, supporting efficient fluid transfer and precise control
in high-pressure hydraulic, pneumatic, and sensitive instrumentation systems. These
tubes maintain structural integrity and dimensional stability under cyclic loading,
vibration, and fluctuating pressure conditions.
Widely used in offshore platforms, chemical processing plants, oil & gas facilities,
marine systems, desalination units, and industrial infrastructure projects, our
UNS S31803 stainless steel seamless tubes are produced and tested in accordance with
international standards to provide a long-lasting, reliable, and cost-effective
solution for demanding service applications.
Our UNS S31803 Stainless Steel Seamless Hydraulic & Instrumentation Tubes are widely supplied across major industrial cities in India, including Mumbai, Chennai, Pune, Ahmedabad, and Hyderabad. These duplex-grade tubes support chemical processing plants, refineries, power generation facilities, and heavy engineering projects that demand high strength and superior resistance to corrosion and stress corrosion cracking.
Throughout the Middle East, we serve the UAE (Dubai, Abu Dhabi, Sharjah, Ajman, Al Ain, and Ras Al Khaimah), Saudi Arabia, Qatar (Doha), Kuwait, Oman, Bahrain, Iraq, Jordan, Lebanon, Yemen, Azerbaijan, and Georgia. Our UNS S31803 seamless tubes are trusted in oil & gas operations, desalination plants, offshore facilities, water treatment systems, and large-scale EPC infrastructure projects operating in highly aggressive and saline environments.
In Europe, our tubes are supplied to Italy, Germany, Spain, France, the United Kingdom, Turkey, Greece, Austria, Russia, Ukraine, and Eastern European markets, where precision, strength, and long-term corrosion resistance are critical. Across Africa, the Americas, and the Asia-Pacific region—including the United States, Canada, Brazil, Argentina, Mexico, Morocco, Algeria, Egypt, Nigeria, South Africa, Kenya, Malaysia, Singapore, Thailand, Vietnam, Sri Lanka, and the Philippines—our UNS S31803 Stainless Steel Seamless Hydraulic & Instrumentation Tubes support offshore platforms, chemical plants, mining operations, marine systems, and industrial processing facilities.
Wherever you operate—Doha, Dubai, London, Moscow, New York, Houston, Singapore, or Sydney—Seminox Pipes & Tubes delivers premium-quality UNS S31803 Stainless Steel Seamless Hydraulic & Instrumentation Tubes, manufactured and certified to international standards to ensure full material traceability, dimensional accuracy, and long-term reliability in critical, pressure-sensitive, and corrosion-intensive hydraulic and instrumentation applications worldwide.
The dual-phase austenitic-ferritic structure of Duplex 2205 provides significantly higher mechanical strength than conventional austenitic grades, allowing thinner wall designs while maintaining excellent pressure-bearing capability in demanding hydraulic and instrumentation systems.
Engineered for superior performance in chloride-rich and aggressive environments, UNS S31803 offers excellent resistance to stress corrosion cracking, pitting, and crevice corrosion in marine, offshore, and chemical processing applications.
Produced using advanced cold drawing and seamless forming techniques to achieve tight dimensional tolerances, consistent wall thickness, and smooth internal surfaces for reliable fluid flow and accurate instrumentation performance.
Finely finished internal surfaces reduce friction and pressure loss, ensuring consistent, stable flow and precise measurement in sensitive process control and instrumentation systems.
Designed for efficient welding and forming with proper procedures, allowing streamlined fabrication, installation, and maintenance without compromising the duplex structure or corrosion resistance.
Delivers extended durability and reduced maintenance in offshore platforms, desalination plants, chemical processing facilities, marine systems, and high-pressure industrial infrastructure operating in highly corrosive and saline conditions.
UNS S31803 Stainless Steel Seamless Hydraulic & Instrumentation Tubes (Duplex 2205) are manufactured using precision cold drawing and cold rolling processes, followed by controlled solution annealing and pickling or bright annealing to maintain the balanced austenitic-ferritic microstructure. This ensures superior mechanical strength, excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, along with tight dimensional tolerances and high-quality surface finish for reliable performance in aggressive and high-pressure service environments.
Each tube undergoes rigorous quality control, including Eddy Current Testing (ECT), Hydrostatic or Pneumatic Pressure Testing, Positive Material Identification (PMI), chemical composition verification, mechanical property testing, dimensional inspection, and 100% visual examination. Testing is performed in accordance with ASTM A789, ASTM A790, ASME SA789 / SA790, and applicable EN standards to ensure safe, consistent, and reliable performance in offshore, oil & gas, chemical processing, marine, and industrial infrastructure applications.
Manufactured and certified in compliance with ASTM A789, ASTM A790, ASME SA789, ASME SA790, EN 10216-5, EN 10297-2, ISO 9001:2015, ISO 14001:2015, ISO 45001:2018, PED 2014/68/EU, and NACE MR0175 / ISO 15156 (for sour service applications, when required). Tubes are supplied with EN 10204 3.1 / 3.2 Mill Test Certificates (MTC), ensuring full traceability, regulatory compliance, and acceptance for EPC, offshore, marine, desalination, petrochemical, and heavy industrial projects worldwide.
Partner with Seminox Pipes & Tubes for certified, project-ready UNS S31803 Stainless Steel Seamless Hydraulic & Instrumentation Tubes (Duplex 2205) manufactured to international standards and supplied with EN 10204 3.1 / 3.2 Mill Test Certificates. Trusted worldwide for offshore platforms, oil & gas facilities, chemical processing plants, desalination systems, marine infrastructure, and industrial projects requiring superior corrosion resistance, high mechanical strength, and long-term reliability in critical hydraulic and instrumentation service environments.
022 6659 5296 +91 9987403801 +918433943801
domestic@seminoxpipes.com export@seminoxpipes.com
1219 / 1220, 12th Floor, Prasad Chambers, Girgaon, Mumbai- 400004
Monday — Friday 9am – 5pm
Saturday — 10am – 3pm
Sunday — Closed
Powered by Seminox Pipes & Tubes Pvt Ltd | Designed and Developed by Skytech SEO Solutions