EN 10210 Seamless Steel Pipe

EN 10210 is part of the European standard that specifies the technical delivery conditions for hot-formed welded structural hollow section steel pipes. Specifically, the EN 10210 standard covers structural hollow seamless steel pipe made of non-alloy and fine-grained steel materials for hot-formed welding. Due to the hot rolling manufacturing process, EN 10210 may have some roughness and unevenness on the surface of the pipe due to the high temperature and rolling force during the hot rolling process. These seamless steel pipes are generally used in building structures, bridges, machinery manufacturing, equipment manufacturing and other engineering applications.

EN 10210 standard

1. Material requirements

The material requirements of steel pipes are strict, covering the chemical composition, physical properties, etc. of different alloy steels and non-alloy steels.

2. Production process requirements

The hot rolling process of steel pipes is clearly specified, especially the requirements for the cooling rate, dimensional accuracy, etc. of steel pipes during the production process.

3. Inspection and quality control

Including quality inspection standards such as the size, wall thickness, and mechanical properties of steel pipes to ensure that the steel pipes meet the relevant performance requirements.

Classification of EN 10210

The EN 10210 standard divides hot-rolled steel pipes into two categories:

1. Non-alloy steel pipes

Used in ordinary construction and structural engineering, such as industrial facilities, storage facilities, etc.

2. Alloy steel pipes

Due to the addition of alloy elements, this type of steel pipe has higher strength, corrosion resistance and better high temperature resistance, and is suitable for more demanding environments, such as high temperature and high pressure energy facilities.

EN 10210 standard applicable size range

Diameter Typical diameters are 21.3mm, 26.9mm, 33.7mm, 42.4mm, etc.

Common wall thicknesses are 2.3mm, 2.6mm, 3.2mm, 4.0mm, etc.

The following table shows a part of the standard sizes of EN 10210 hollow round tubes:

Chemical composition requirements

The chemical composition of EN 10210 seamless steel pipes includes carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), etc. The carbon content is generally required to be no more than 0.22%, the silicon content is no more than 0.55%, the manganese content is no more than 1.6%, the phosphorus content is no more than 0.025%, and the sulfur content is no more than 0.025%. EN 10210 seamless pipes have excellent machinability and can meet appropriate strength in occasions such as OCTG pipe. .

Tolerance requirements

The EN 10210 standard has clear provisions for the outer diameter, wall thickness and other dimensions of seamless steel pipes. The allowable tolerances of outer diameter and wall thickness vary according to different size ranges. For example, for steel pipes with an outer diameter within a certain range, the outer diameter tolerance may be around plus or minus 1%, and the wall thickness tolerance also has a corresponding strict range, which ensures the dimensional accuracy of the steel pipe to meet the requirements of various engineering applications. For example, in application scenarios such as pipeline connection, accurate dimensions are the key to ensuring the sealing and stability of the pipeline system.

Surface quality requirements

The surface of the steel pipe should be free of harmful defects, such as cracks, folds, delamination, etc. Slight surface roughness and some surface defects that do not affect the performance, such as small dents, etc., are allowed, but the depth and range of these defects are also limited. Good surface quality is important for the corrosion resistance and appearance of steel pipes, especially in some applications with high surface quality requirements, such as steel pipes for architectural decoration or carbon steel pipe used in corrosive environments.

Application scope

Seamless steel pipes that meet EN 10210 standards are widely used in the field of building structures, such as building frames, scaffolding, etc.; in mechanical manufacturing, they can be used to manufacture some mechanical parts that do not have extremely high requirements for strength and precision, such as ordinary conveying equipment, support structures for small machinery, etc.; in pipeline engineering, they are used to transport some low-pressure fluid media, such as low-pressure water, air and other pipeline systems.

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