Manufacturers and suppliers of 321H Stainless Steel Seamless Hydraulic & Instrumentation Tubes, engineered for sustained high-temperature, high-pressure, and corrosive service environments in petrochemical plants, refineries, aerospace systems, and power generation facilities.
Our 321H Stainless Steel Seamless Hydraulic & Instrumentation Tubes
are specially engineered for high-temperature and high-pressure applications where
enhanced mechanical strength and superior oxidation resistance are critical.
Manufactured from 321H stainless steel, a high-carbon,
titanium-stabilized grade, these tubes offer excellent resistance to intergranular
corrosion, even after prolonged exposure to elevated temperatures and welding
conditions.
Designed to perform reliably at temperatures of up to
900°C (1,650°F), these seamless tubes are widely used in chemical
processing plants, power generation facilities, petrochemical systems, and thermal
processing industries. The precision seamless construction ensures smooth internal
surfaces, reducing turbulence, minimizing pressure loss, and promoting efficient
fluid flow in critical hydraulic and instrumentation systems.
With outstanding resistance to pitting, crevice corrosion, and aggressive
chemical environments, 321H stainless steel tubes provide long-term
durability, reduced maintenance requirements, and consistent performance in
demanding service conditions. Available in a wide range of sizes and specifications,
they deliver a reliable, high-performance solution for critical industrial
applications requiring strength, heat resistance, and corrosion protection.
Our 321H Stainless Steel Seamless Hydraulic & Instrumentation Tubes are trusted across major industrial cities in India, including Mumbai, Chennai, Pune, and Ahmedabad, supporting petrochemical plants, refineries, power generation facilities, and high-temperature industrial projects that demand reliable, oxidation-resistant, and corrosion-resistant tubing solutions.
Throughout the Middle East, we supply the UAE (Dubai, Abu Dhabi, Sharjah, Ajman, Ras Al Khaimah, and Al Ain), Saudi Arabia, Qatar, Kuwait, Oman, Bahrain, Iraq, Jordan, Yemen, Lebanon, Syria, Azerbaijan, and Georgia. Our 321H stainless steel seamless tubes are widely used in oil & gas processing, water treatment facilities, power generation, and EPC projects operating under extreme heat, pressure, and aggressive service conditions.
In Europe, our tubes serve Italy, Spain, Germany, France, the United Kingdom, Greece, Austria, Turkey, Russia, Ukraine, and Eastern European and Central Asian markets. Across Africa, the Americas, and the Asia-Pacific region—including the United States, Canada, Brazil, Mexico, Argentina, South Africa, Nigeria, Egypt, Morocco, Kenya, Singapore, Malaysia, Thailand, Vietnam, Sri Lanka, and Australia— our 321H Stainless Steel Seamless Hydraulic & Instrumentation Tubes support chemical processing plants, offshore platforms, power stations, heavy manufacturing, and thermal processing industries.
Wherever you operate—Doha, Dubai, London, Moscow, New York, Singapore, or Sydney— Seminox Pipes & Tubes delivers premium-quality 321H Stainless Steel Seamless Hydraulic & Instrumentation Tubes, manufactured and certified to international standards to ensure precision, full traceability, and long-term performance in critical fluid control and high-temperature instrumentation applications worldwide.
Manufactured using advanced cold drawing and seamless forming processes to achieve uniform wall thickness, tight dimensional tolerances, and smooth internal surfaces for consistent fluid flow and precise instrumentation performance.
The high-carbon, titanium-stabilized composition of 321H improves high-temperature strength and creep resistance while preventing carbide precipitation, ensuring excellent resistance to intergranular corrosion after welding and prolonged heat exposure.
Provides reliable performance in continuous service at elevated temperatures, resisting oxidation, scaling, and thermal fatigue in heat-intensive industrial and process environments.
Precision-finished internal surfaces reduce friction, minimize pressure loss, and enhance flow stability for sensitive hydraulic and instrumentation systems.
Maintains mechanical integrity and dimensional stability under high pressure, severe thermal cycling, and continuous elevated-temperature operating conditions.
Engineered for extended durability, reduced downtime, and lower lifecycle costs in petrochemical plants, refineries, power generation facilities, aerospace systems, and high-temperature process industries.
321H Stainless Steel Seamless Hydraulic & Instrumentation Tubes are manufactured using precision cold drawing and cold rolling processes, followed by controlled solution annealing and pickling or bright annealing. The titanium-stabilized, high-carbon composition ensures a fully austenitic, homogeneous microstructure with enhanced high-temperature strength, excellent oxidation resistance, and superior resistance to intergranular corrosion—delivering tight dimensional tolerances and consistent performance in high-pressure and elevated-temperature hydraulic and instrumentation service environments.
Each tube undergoes comprehensive quality control including Eddy Current Testing (ECT), Hydrostatic or Pneumatic Pressure Testing, Positive Material Identification (PMI), chemical composition verification, mechanical and elevated-temperature performance testing, dimensional inspection, and 100% visual examination. These procedures ensure full compliance with ASTM A213 / A269 and ASME SA213 / SA269 standards for safe, reliable operation in critical, corrosive, and high-temperature service conditions.
Manufactured in accordance with ASTM A213, ASTM A269, ASME SA213, ASME SA269, EN 10216-5, ISO 9001:2015, ISO 14001:2015, ISO 45001:2018, and PED 2014/68/EU directives. Tubes are supplied with EN 10204 3.1 / 3.2 Mill Test Certificates (MTC), ensuring full traceability, regulatory compliance, and acceptance for EPC, petrochemical, power generation, refinery, chemical processing, aerospace, and offshore projects worldwide.
Partner with Seminox Pipes & Tubes for certified, project-ready 317H Stainless Steel Seamless Hydraulic & Instrumentation Tubes manufactured to international standards and supplied with EN 10204 3.1 / 3.2 Mill Test Certificates (MTC). Trusted globally for petrochemical, chemical processing, power generation, and high-temperature industrial applications requiring superior corrosion resistance, enhanced creep strength, and long-term reliability in critical and heat-intensive service environments.
022 6659 5296 +91 9987403801 +918433943801
domestic@seminoxpipes.com export@seminoxpipes.com
1219 / 1220, 12th Floor, Prasad Chambers, Girgaon, Mumbai- 400004
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