EN 10255 STEEL PIPE

Release time：

2025-12-03

EN 10255 is a European standard for non-alloy steel pipes (commonly known as "black pipes" or "galvanized pipes") suitable for welding and threading. The following table summarizes its core information, making it convenient for you to understand quickly.

Project	Detailed information
standard name	Non-alloy steel pipes suitable for welding and threading - Delivery technical conditions
Common steel grade	S195T (steel grade 1.0026)
Main dimension	- Outer diameter range: 10.2mm to 165.1mm (corresponding to thread size 1/8 to 6 inches) - Wall thickness series: Mainly divided into two series, "Medium" and "Heavy"
Typical application	Fluid transportation (water, gas, air, oil), heating/cooling systems, fire sprinkler systems, building structures, etc

🔧 Standard requirements and product features

The EN 10255 standard has a series of clear requirements for steel pipes, which also constitute the main characteristics of its products:

• Material properties:

The standard clearly stipulates the chemical composition and mechanical properties of steel. Taking the common S195T grade as an example, its yield strength is required to be no less than 195 MPa, and the tensile strength is between 320 and 520 MPa, ensuring that the pipeline has sufficient foundation strength.

• Dimensions and Tolerances:

The standard strictly stipulates the outer diameter, wall thickness and other dimensions of steel pipes, as well as their allowable deviations, to ensure their interchangeability and connection reliability in engineering. For instance, the outer diameter tolerance is typically ±0.5mm to ±1.0mm, and the wall thickness tolerance is ±10% of the nominal value.

• Process and Inspection:

Steel pipes need to undergo a series of strict tests. Common items include hydrostatic tests (to verify pressure-bearing capacity), mechanical property tests (such as tensile and bending), and non-destructive testing (such as eddy current testing or ultrasonic testing), etc., to ensure product quality.

• Surface treatment and connection:

EN 10255 steel pipes can undergo different surface treatments as required. The most common one is hot-dip galvanizing, which provides excellent anti-corrosion protection. Its pipe end design makes it highly suitable for threaded connection or welding, and it is easy to install.

💎 Purchase and use suggestions

When choosing and using EN 10255 steel pipes, the following points can be noted:

• Clarify requirements:

Confirm the required wall thickness series based on the application (medium type is suitable for general pressure scenarios, while heavy type is used in higher load environments) and surface treatment (if rust prevention is needed, choose galvanized pipes).

• Pay attention to the standard version:

Please note that there are both new and old versions of the standard, such as EN 10255:2004+A1:2007 and the updated EN 10255:2015.

When purchasing, you can confirm the standard version you are relying on.

• Certification Requirements:

If the product is used in the EU market or specific fields (such as construction projects), it may need to comply with the EU Construction Products Regulation (CPR) and affix the CE marking. It is necessary to ensure that the supplier can provide the corresponding declaration of conformity or certification certificate.

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