304 Stainless Steel Seamless Hydraulic Tubes & Instrumentation Tubes

High Precision • Clean Bore Finish • Reliable Pressure Performance

Manufacturers and suppliers of 304 Stainless Steel Seamless Hydraulic Tubes & Instrumentation Tubes, engineered for fluid power systems, control lines, and precision instrumentation applications requiring excellent dimensional accuracy, and corrosive service environments.

ISO 9001:2015 • ISO 14001:2015 • ISO 45001:2018 • PED 2014/68/EU • EN 10204 3.1/3.2 Certified

304 Stainless Steel Seamless Hydraulic Tubes & Instrumentation Tubes

Our 304 Stainless Steel Seamless Hydraulic Tubes & Instrumentation Tubes are engineered for precision fluid power and control systems where dimensional accuracy, clean internal surfaces, and consistent mechanical performance are critical. Manufactured from premium AISI 304 / UNS S30400 stainless steel, these tubes offer excellent resistance to oxidation, general corrosion, and scaling in a wide range of industrial and commercial environments.

The seamless, high-precision construction ensures uniform wall thickness and a smooth internal bore, reducing pressure loss and improving system responsiveness in hydraulic circuits, pneumatic lines, and sensitive instrumentation applications. These tubes maintain structural integrity under varying pressures and temperature conditions, ensuring long-term operational reliability.

Widely used in oil & gas control systems, chemical processing plants, power generation facilities, pharmaceutical and food & beverage equipment, and industrial automation, our 304 stainless steel seamless tubes are manufactured and tested to meet international standards, delivering a durable, hygienic, and cost-effective solution for precision piping and pressure service needs.

304 Stainless Steel Seamless Hydraulic Tubes & Instrumentation Tubes

Comprehensive Reach

Our 304 Stainless Steel Seamless Hydraulic Tubes & Instrumentation Tubes are trusted across major industrial cities in India, including Mumbai, Chennai, Pune, Ahmedabad, and Hyderabad, supporting chemical processing, automation, fluid handling, power generation, and large-scale infrastructure and EPC projects.

In the Middle East, we serve the UAE, Saudi Arabia, Qatar, Kuwait, Oman, Bahrain, Jordan, and Iraq, where our 304 stainless steel hydraulic and instrumentation tubes are relied upon for oil & gas control systems, water treatment plants, industrial piping networks, and precision fluid transfer in demanding service environments.

Europe, Africa, Americas & Asia-Pacific

Across Europe—including Germany, Italy, France, Spain, the United Kingdom, Turkey, and Eastern European markets—our tubes are valued for their dimensional accuracy and consistent performance in manufacturing, process automation, and industrial equipment systems. In Africa, the Americas, and the Asia-Pacific region, our products support marine, chemical processing, power generation, mining, and large-scale industrial projects operating in corrosive and high-pressure environments.

Commitment to Quality

Wherever you operate—Doha, Dubai, London, Moscow, or New York—Seminox Pipes & Tubes delivers premium-quality 304 Stainless Steel Seamless Hydraulic Tubes & Instrumentation Tubes, manufactured and certified to international standards for traceability, durability, and long-term performance in precision piping and pressure service applications worldwide.

Key Features of 304 Stainless Steel Seamless Hydraulic Tubes & Instrumentation Tubes

High-Precision Seamless Manufacturing

Cold drawn and hot finished seamless processes ensure uniform wall thickness, tight dimensional tolerances, and a clean, smooth internal bore for reliable performance in hydraulic, pneumatic, and instrumentation systems.

Excellent Corrosion & Oxidation Resistance

AISI 304 / UNS S30400 stainless steel provides strong resistance to general corrosion, oxidation, and scaling, making these tubes suitable for a wide range of industrial, commercial, and indoor/outdoor service environments.

Clean Bore for Accurate Instrumentation

Smooth internal surfaces minimize contamination, pressure drop, and flow turbulence, ensuring precise signal transmission and consistent performance in sensitive control, sensing, and measurement lines.

Reliable Mechanical Strength for Pressure Systems

Designed to withstand moderate to high operating pressures and thermal variations, ensuring dependable service in hydraulic circuits, fluid power systems, and industrial piping networks.

Wide Size Range & Custom Fabrication

Available in a broad range of diameters, wall thicknesses, and custom cut lengths, with optional bending, polishing, and surface finishes to meet project and OEM specifications.

Long Service Life & Low Maintenance Cost

Durable metallurgy and consistent quality help reduce downtime and lifecycle costs in chemical processing, power generation, automation, and precision fluid control applications.

Product Specification – 304 Stainless Steel Seamless Hydraulic Tubes & Instrumentation Tubes

Outside Diameter
6.00 mm to 114.30 mm (1/4” to 4.5”)
Wall Thickness
0.70 mm to 12.70 mm (0.028” to 0.500”)
Grade / Material
Austenitic Stainless Steel
AISI 304 / UNS S30400
EN 1.4301 / X5CrNi18-10
Manufacturing Process
Seamless (Cold Drawn / Hot Finished) • Solution Annealed • Pickled / Bright Annealed
Standards & Specifications
ASTM A269 – General Service & Instrumentation Tubes
ASTM A213 – Seamless Boiler, Superheater & Heat Exchanger Tubes
ASTM A511 – Mechanical Tubing
EN 10216-5 – Seamless Stainless Steel Tubes
DIN 17458 / DIN EN 10305-1 (Precision Tubes, where applicable)
EN 10204 3.1 / 3.2 – Inspection & Test Certificates
Customer Drawings & EPC / Project Specifications
Length
Standard: 6 meters • Random Lengths • Up to 24 meters
Custom cut lengths, coiled tubing, and special packaging available
Surface Finish
Annealed & Pickled (AP), Bright Annealed (BA),
Polished (180 / 240 / 320 / 400 Grit), Electropolished, Honed (on request)
Mechanical Properties (Typical)
Yield Strength: ≥ 205 MPa
Tensile Strength: 515–750 MPa
Elongation: ≥ 35%
Applications
Hydraulic & Pneumatic Lines, Instrumentation & Control Tubing,
Chemical & Petrochemical Plants, Oil & Gas Control Systems,
Power Generation Equipment, Food & Beverage Processing,
Pharmaceutical & Clean Service Lines, Automation Systems,
High-Pressur

Manufacturing, Testing & Quality Assurance – 304 Stainless Steel Tubes

Advanced Manufacturing

304 Stainless Steel Seamless Hydraulic and Instrumentation Tubes are produced using precision cold drawing and hot finishing processes, followed by solution annealing and pickling or bright annealing. This ensures a uniform austenitic microstructure, smooth internal surfaces, tight dimensional tolerances, and consistent mechanical properties required for precision fluid control, hydraulic systems, and instrumentation lines.

Inspection & Testing

Each tube undergoes comprehensive quality checks including Eddy Current Testing (ECT), Hydrostatic or Pneumatic Pressure Testing, Positive Material Identification (PMI), chemical composition analysis, mechanical property testing, dimensional inspection, surface roughness verification (on request), and 100% visual inspection. These procedures ensure reliable performance in high-pressure, clean service, and precision control environments.

Certifications & Compliance

Manufactured in accordance with ASTM A269, ASTM A213, ASTM A511, and EN 10216-5 standards, and supplied under ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 quality systems. Tubes are delivered with EN 10204 3.1 / 3.2 Inspection Certificates, ensuring full traceability, regulatory compliance, and acceptance for EPC, OEM, and industrial automation projects worldwide.

Typical Applications of UNS S31803 Duplex Stainless Steel Seamless Tubes

Heat Exchangers & Condensers
Oil & Gas Processing & Utility Lines
Marine & Offshore Piping Systems
Chemical & Petrochemical Processing Plants
Desalination & Seawater Handling Systems
Pressure Vessels & High-Pressure Piping
Power Generation & Thermal Transfer Systems
Pulp & Paper Industry Equipment
Industrial Systems Exposed to Chlorides & Corrosive Media

Need 304 Stainless Steel Seamless Hydraulic Tubes & Instrumentation Tubes for Your Project?

Partner with Seminox Pipes & Tubes for certified, project-ready 304 Stainless Steel Seamless Hydraulic & Instrumentation Tubes manufactured to ASTM A269 / ASTM A213 / EN 10216-5 standards and supplied with EN 10204 3.1 / 3.2 Inspection Certificates. Trusted worldwide for chemical processing, oil & gas control systems, automation, power generation, food & beverage, pharmaceutical, and precision fluid handling applications requiring dimensional accuracy, corrosion resistance, and long-term operational reliability.

Get in Touch

Phone Number

022 6659 5296
+91 9987403801
+918433943801

Email

domestic@seminoxpipes.com
export@seminoxpipes.com

Address

1219 / 1220, 12th Floor, Prasad Chambers, Girgaon, Mumbai- 400004

Business Hours

Monday — Friday 9am – 5pm
Saturday — 10am – 3pm
Sunday — Closed

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