EN 10219 S235JRH Steel Pipes

EN 10219 S235JRH steel pipe is a mainstream structural cold-formed welded steel pipe under European standards, widely used in construction, machinery manufacturing, and infrastructure. It is defined by two core parts: EN 10219 is the manufacturing standard for the pipe, and S235JRH is the steel grade.

Standard and Material Explanation:

● EN 10219: This is a technical specification developed by the European Union for welded cold-formed hollow profiles (such as square and rectangular tubes) of non-alloy and fine-grained structural steel. It strictly specifies the requirements for pipe manufacturing processes, dimensional tolerances, mechanical properties, chemical composition, and surface quality, ensuring high consistency and reliability, and is particularly suitable for projects with high structural safety requirements.

● S235JRH: This is the steel grade, with the following meanings:

S: Represents Structural Steel. 

235: Represents the minimum yield strength of this steel as 235 MPa (applicable to wall thickness ≤ 16 mm). This means it can withstand medium-strength loads and is suitable for general load-bearing structures.

JR: Indicates that the steel has an impact energy ≥ 27 J when subjected to impact testing at room temperature (+20°C). This demonstrates its good toughness and ability to resist impact loads.
H: Represents hollow section steel.

Advantages of S235JRH steel pipe:

1. High strength and good toughness

Yield strength ≥ 235 MPa, tensile strength between 370–510 MPa, elongation ≥ 24%, and impact toughness still reaches 27 J at -20°C, ensuring the safety of the material under low temperature or dynamic loads. 

2. Excellent Welding and Machining Performance

Due to its low carbon content (carbon ≤ 0.17%) and reasonable chemical composition control, S235JRH steel has excellent weldability. Welds are less prone to cracking, making it suitable for various conventional welding processes without the need for complex preheating and post-weld heat treatment. It is also easy to perform secondary processing such as cutting, drilling, stamping, and cold bending, flexibly adapting to various design requirements.

3. High Dimensional Accuracy
As a cold-formed pipe, it has a regular shape (e.g., square, rectangular), uniform wall thickness, good surface quality, and strict dimensional tolerance control, facilitating installation and assembly.

Common Specification Range:

EN 10219 S235JRH steel pipes are available in three forms: round tube (CHS), square tube (SHS), and rectangular tube (RHS), covering a very wide range of sizes to meet different engineering needs.

1. Round Tube
Outer Diameter Range: Typically from 21.3 mm to 2500 mm or even larger. Common small sizes include 33.7mm, 48.3mm, 60.3mm, and 88.9mm, while larger sizes are used for structural columns or pipe piles.

2. Square and Rectangular Tubes

This is the most commonly used form, with dimensions determined by side length and wall thickness.

Common side lengths for square tubes: 

From smaller sizes like 20×20 mm, 25×25 mm, and 40×40 mm, to medium sizes like 50×50 mm, 60×60 mm, 80×80 mm, and 100×100 mm, and then to large sizes like 150×150 mm, 200×200 mm, and 250×250 mm, even reaching 400×400 mm.

Common side lengths of rectangular tubes:
For example, 50×30 mm, 60×40 mm, 80×40 mm, 100×50 mm, 100×60 mm, 120×80 mm, 150×100 mm, 200×100 mm, 300×200 mm, etc.

Wall thickness range: Generally between 1.5 mm and 40 mm. Common wall thicknesses include 2.0 mm, 2.5 mm, 3.0 mm, 4.0 mm, 5.0 mm, 6.0 mm, 8.0 mm, 10.0 mm, etc.
Length: Standard supply lengths are usually 6 meters or 12 meters, but other lengths can be customized according to customer requirements.

Application:

S235JRH steel pipes, due to their excellent performance and diverse specifications, are widely used in various structural engineering projects:

1. Building Structures: Used for constructing beams, columns, and trusses in steel structure buildings; steel structure workshops; bridge supports; and frames and support systems for high-rise buildings.
2. Machinery Manufacturing: Suitable for structural frames and load-bearing supports in machinery and equipment, agricultural machinery, vehicle chassis, crane booms, and conveyor systems.
3. Energy and Transportation: Used in power transmission towers, transport vehicles, and offshore wind power foundation piles.
4. Renewable Energy: Also widely used in projects such as solar photovoltaic supports and the internal structures of wind turbine towers.
5. Municipal and Infrastructure: Such as bridge structures, temporary supports, fences, and light poles.

What are the differences between S235JRH and S355J2H? How to choose?

The main differences between the two lie in their strength grades and low-temperature performance:

S235JRH: Yield strength 235 MPa, guaranteed only for room temperature (+20°C) impact, suitable for conventional structures at normal temperatures.
S355J2H: Yield strength 355 MPa, guaranteed for -20°C impact, suitable for high loads or cold environments.

Selection recommendation: S235JRH is sufficient for general construction; S355J2H is recommended for important load-bearing applications, large spans, and low-temperature environments.

Read more: EN 10219 vs EN 10210 or Square Tube Weight Calculation Formula