EN 10255 Steel Pipe


EN 10255 Steel Pipe

At UNIACERO, we pride ourselves on supplying steel pipes that adhere to the BS EN 10255 standard, a renowned European standard that sets the benchmark for non-alloy steel pipes suitable for welding or threading. This standard, ratified by European Standards Organizations, ensures that our pipes meet the highest quality and safety standards. As a part of the Euronorm family, our products guarantee seamless integration into projects across all EU member states. Our pipes are versatile and suitable for various industries from construction to gas and water distribution. With UNIACERO, you’re not just purchasing steel pipes; you’re investing in European quality and excellence.

EN 10255 Specification

Our BS EN 10255 pipes come with precise specifications ensuring their reliability and durability. They are crafted from the steel grade S195T, ensuring robustness. The pipes undergo rigorous testing for chemical composition and mechanical properties, ensuring they meet the necessary safety and quality standards. We offer various finishes, including flat-end pipes and threaded and socket-end pipes, giving our clients a plethora of options to choose from. Furthermore, our pipes are compatible with international standards like ASTM A53 and EN 10217-1, ensuring global applicability.

Production StandardEN10255
Manufacturing ProcessesERW (Electric Resistance Welding)
SMLS (Hot Finished / Cold Drawn Seamless)
Outside Diameter2mm -5.4mm (1/8″ – 6″)
Wall Thickness2mm – 5.4mm (light-medium-heavy)
Pipe Lengthstandard 6 or 6.4m
Random 4- 16mtr
Steel GradeS195 T
Corrosion PreventionLacquer, Varnish, Oiling, Galvanizing
End ProcessesSquare Cut, Bevelling, Threading, Socket,Grooving
Further ProcessingWelding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

EN 10255 Dimension Table


Our pipes are available in a range of sizes, from an outside diameter of 10.2 mm to 165.1 mm, catering to diverse project requirements. They come in two series, medium and heavy, and three types of designated thicknesses. Whether you’re looking for pipes for structural purposes or fluid transport, our dimension table ensures you find the perfect fit for your needs.

Dimensions, Diameter Tolerance And Mass Per Unit Length
Specified Outside Diametera D (mm)Thread Sizea ROutside DiameterH Heavy SeriesM Medium Series
max. (mm)min. (mm)Wall Thickness T (mm)Mass Per Unit Length Of Bare TubeWall Thickness T (mm)Mass Per Unit Length Of Bare Tube
Plain End (kg/m)Socketed (kg/m)Plain End (kg/m)Threaded and Socketed (kg/m)
42.41 1/442.942.04.03.793.823.23.103.13
48.31 1/248.847.94.04.374.413.23.563.60
76.12 1/276.675.34.57.938.053.66.426.54
  a For relationship between specified outside diameter (D), thread size (R) and nominal diameter (DN), see Annex A. T = specified wall thickness.

Chemical Requirements of EN 10255

To ensure the highest quality, our pipes adhere to strict chemical composition requirements set by the BS EN 10255 standard. This ensures that the pipes are not only strong but also resistant to various environmental factors, ensuring longevity and reliability.

Chemical Composition (Cast Analysis) And Mechanical Properties
Steel GradeChemical Composition %Mechanical Properties
Upper Yield Strength ReH min. (MPa)Tensile Strength Rm (MPa)Elongation A min. %
Steel NameSteel NumberC maxMn maxP maxS max
S 195T1.00260.201.400.0350.030195320 to 52020

Mechanical Requirements of EN 10255

Our pipes undergo rigorous mechanical testing to ensure they can withstand the pressures of their intended use. From tensile strength to elasticity, we ensure that our pipes meet and exceed the mechanical requirements set by the BS EN 10255 standard.

Chemical Composition (Cast Analysis) And Mechanical Properties
Steel GradeChemical Composition %Mechanical Properties
Upper Yield Strength ReH min. (MPa)Tensile Strength Rm (MPa)Elongation A min. %
Steel NameSteel NumberC maxMn maxP maxS max
S 195T1.00260.201.400.0350.030195320 to 52020

Steel Grades in EN 10255

We use the S195T steel grade for our pipes, a grade known for its strength and durability. This ensures that our pipes are not only robust but also suitable for a wide range of applications, from construction to fluid transport.

Production Tolerance of EN 10255

For welded tubes the tolerance on wall thickness is:
 ± 10 % .for M and H series and Type L ;
 – 8 % with the plus tolerance limited by the mass tolerance, for Types L1 and L2.

8.4.5 The mass tolerance on welded tubes is:
 ± 7,5 % on bundles of 10 tons or more, for M and H series and Type L ;
 +10% -8% on individual tubes for Types L1 and L2.

For seamless tubes the tolerance on wall thickness is ± 12,5 %. The maximum tolerance does not apply if the actual weight of a bundle does not exceed the theoretical weight, calculated from the nominal mass per unit length (see Tables 2, B1, B2, or B3, as appropriate), by more than + 7,5 %.

Reference Resource

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.

Related Products



Our seamless pipes Range in sizes from 1/8 inches to 36 inches, they are produced using high-quality carbon or alloy steel.


ERW Pipe

Our carbon steel EAW pipe with an O.D. ranging from 21.3mm to 660mm and W.T. between 1.0mm to 20mm.



The dimensions of our SSAW steel pipes range typically from 20 inches to 80 inches (406mm to 2032mm) in diameter.



With dimensions ranging from an OD of 406 mm to 1626 mm and a thickness of 6.35 mm to 75 mm, our LSAW pipes cater to a diverse set of requirements.