ISO 65

iso-65-screwing-pipe

ISO 65 Steel Pipe

ISO 65 is the international standard that specifies Carbon steel tubes suitable for screwing. Developed by the International Organization for Standardization (ISO), this standard ensures the highest quality and precision for steel tubes. UNIACERO, as a leading international trading company, proudly exports these steel tubes from China to clients worldwide. Our tubes are manufactured in compliance with ISO standard, ensuring seamless integration into your projects. Whether you’re in construction, engineering, or any industry requiring robust steel tubes, our products guarantee durability, precision, and excellence.

ISO 65 Specification

Our steel tubes come in four distinct series:

Heavy series: Suitable for both seamless and welded steel tubes.
Medium series: Ideal for seamless and welded steel tubes.

Production StandardISO 65
Manufacturing ProcessesSMLS (Hot Finished Seamless)
SMLS (Cold – Finished Seamless)
ERW (Electric Resistance Welding)
Outside Diameter10.3mm – 165.1mm (1/8″ – 6″)
Wall Thickness1.8 – 21.9 mm
Pipe Length6 meters, 12 meters, or customized.
Steel GradeTS.O
 TW.O
Corrosion PreventionLacquer, Varnish, Oiling, Galvanizing
End ProcessesSquare Cut, Bevelling, Threading, Grooving
Further ProcessingWelding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

ISO 65 Dimension Table

schematic-diagram-of-pipe-dimension

The dimensions of our steel tubes are in strict adherence to the ISO 65 standard. From the smallest 6 DN to the largest 150 DN, each tube is crafted to perfection, ensuring a snug fit for your requirements. The specified outside diameter, thickness, and masses per unit length are detailed, providing clarity and assurance in your selection.

Thickness according to the series
DNDesignation
of thread
Outside
Diameter

 

mm

Heavy series

mm

Medium series

mm

Light series 1

mm

Light series 2

mm

61/810.22.62.01.81.8
81/413.52.92.32.01.8
103/817.22.92.32.01.8
151/221.33.22.62.32.0
203/426.93.22.62.32.3
25133.74.03.22.92.6
321 1/442.44.03.22.92.6
401 1/248.34.03.22.92.9
50260.34.53.63.22.9
652 1/276.14.53.63.23.2
80388.95.04.03.63.2
1004114.35.44.54.03.6
1255139.75.45.0
1506165.15.45.0

Chemical Requirements of ISO 65

Our steel tubes are made from the finest materials, ensuring they meet the stringent chemical requirements of ISO 65. This ensures longevity, resistance to wear and tear, and the ability to withstand challenging environments.

Steel Grade DesignationTensile StrengthMinimum Elongation After FractureChemical composition ladle Analysis % max.
SeamlessWeldedN/mm2%PS
TS.OTW.O320 to 520150.060.06

Mechanical Requirements of ISO 65

Mechanical integrity is at the heart of our steel tubes. They are designed to withstand pressure, weight, and the rigors of daily use, ensuring they remain functional and intact for years to come.

Steel Grade DesignationTensile StrengthMinimum Elongation After FractureChemical composition ladle Analysis % max.
SeamlessWeldedN/mm2%PS
TS.OTW.O320 to 520150.060.06

Steel Grades in ISO 65

We offer two primary steel grades for our tubes: TS and TW. Each grade is chosen based on its unique properties, ensuring that you have the perfect tube for your specific needs.

Our Advantages

  1. Over 25 years of experience in pipeline production and installation.
  2. Comprehensive inspection equipment.
  3. Independent product serial numbers for traceability.
  4. Advanced production equipment – Seamer high-frequency welding machine from the United States.
  5. Complete qualifications – API 5L/API 5CT/FM/UL fire pipe certification, etc.
  6. Wide range of products – independently developed solar torque tubes, highly favored in the European market.
  7. Customers spread across the globe.
  8. Excellent after-sales service and sense of responsibility.

Application Scenarios

Our steel pipes are engineered to withstand high temperatures, corrosive environments, and varying pressures, ensuring reliability and safety in the complex petrochemical processes. 

Whether it’s transferring crude oil, natural gas, or chemical intermediates, the robustness and versatility of steel pipes make them indispensable components of the plant’s infrastructure, contributing to efficient production and maintenance of stringent safety standards.

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