Manufacturers and suppliers of 347 Stainless Steel Seamless Hydraulic & Instrumentation Tubes, engineered for high-temperature, high-pressure, power generation facilities, and chemical processing systems.
Our 317H Stainless Steel Seamless Hydraulic & Instrumentation Tubes
are engineered for demanding high-temperature and highly corrosive environments where
superior mechanical strength, enhanced creep resistance, and long-term operational
reliability are essential. The high-carbon composition of Grade 317H
improves structural stability at elevated temperatures, while the increased
molybdenum and chromium content delivers exceptional protection against pitting,
crevice corrosion, and stress corrosion cracking in aggressive chemical and
chloride-rich service conditions.
The seamless, precision-manufactured construction ensures uniform wall thickness and
smooth internal surfaces, reducing pressure losses and improving flow efficiency in
critical hydraulic and instrumentation systems. These tubes maintain performance
under high pressure, thermal cycling, and continuous heat exposure, making them ideal
for safety-critical fluid control and precision measurement applications.
Widely used in petrochemical and chemical processing plants, refineries, power
generation facilities, offshore and marine systems, and high-temperature industrial
operations, our 317H stainless steel seamless tubes are manufactured and tested to
international standards to deliver a durable, high-performance, and cost-effective
solution for harsh, heat-intensive, and corrosive service environments.
Our 347 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 critical infrastructure projects that demand reliable, high-temperature and corrosion-resistant tubing solutions.
Throughout the Middle East, we supply the UAE (Dubai, Abu Dhabi, Sharjah, Ajman, and Ras Al Khaimah), Saudi Arabia, Qatar, Kuwait, Oman, Bahrain, Iraq, Jordan, and Lebanon. Our 347 stainless steel seamless tubes are widely used in oil & gas processing, water treatment facilities, and EPC projects operating under extreme heat, pressure, and corrosive service conditions.
In Europe, our tubes serve Italy, Germany, Spain, France, the United Kingdom, Turkey, Greece, Austria, and Eastern European markets, where precision engineering and high-temperature performance are essential. Across Africa, the Americas, and the Asia-Pacific region—including the United States, Canada, Brazil, Mexico, South Africa, Nigeria, Singapore, Malaysia, Thailand, Vietnam, and Australia—our 347 Stainless Steel Seamless Hydraulic & Instrumentation Tubes support chemical processing plants, power stations, offshore platforms, heavy manufacturing, and thermal processing industries.
Wherever you operate—Doha, Dubai, London, Houston, Singapore, Sydney, or New York— Seminox Pipes & Tubes delivers premium-quality 347 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 ensure uniform wall thickness, tight dimensional tolerances, and smooth internal surfaces for consistent fluid flow and accurate instrumentation performance.
The niobium stabilization in Grade 347 prevents chromium carbide precipitation during welding and prolonged heat exposure, delivering excellent resistance to intergranular corrosion in high-temperature service environments.
Maintains mechanical strength, dimensional stability, and oxidation resistance under continuous thermal cycling and elevated-temperature operating conditions.
Precision-finished internal surfaces reduce friction, minimize pressure loss, and enhance flow stability for sensitive hydraulic and instrumentation systems.
Provides excellent resistance to general corrosion, scaling, and chemical attack in petrochemical, chemical processing, and marine service environments.
Engineered for extended durability, lower downtime, and reduced lifecycle costs in refineries, power generation plants, offshore systems, and high-temperature industrial applications.
347 / 347H 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 niobium-stabilized composition produces a fully austenitic, homogeneous microstructure with excellent resistance to intergranular corrosion, enhanced high-temperature strength, and tight dimensional tolerances for high-pressure and high-heat hydraulic and instrumentation service applications.
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 and reliable performance in critical, corrosive, and high-temperature service environments.
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, and offshore projects worldwide.
Partner with Seminox Pipes & Tubes for certified, project-ready 347 / 347H Stainless Steel Seamless Hydraulic & Instrumentation Tubes manufactured to international standards and supplied with EN 10204 3.1 / 3.2 Mill Test Certificates. Trusted worldwide for petrochemical, chemical processing, power generation, and high-temperature industrial applications requiring superior resistance to intergranular corrosion, oxidation, and long-term reliability in heat-intensive and critical 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
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