What is the difference between the steel pipes of EN10219 and EN10210?

At present, structural hollow sections are widely used in the construction and manufacturing industries, and different application scenarios require different standards of steel hollow sections. The most common steel pipe standards are EN10219 and EN10210, which specify the quality, performance, and delivery status of steel pipes. Studying their differences is very useful for us.

EN10219 is a European standard that provides detailed regulations and requirements for the dimensions, mechanical properties, chemical composition, and other aspects of British standard steel pipes. The EN10219 standard is applicable to non alloy and fine-grained non alloy cold formed welded and seamless steel pipes.

EN10210 is a part of the European standard that specifies the technical delivery conditions for hot-formed welded structural hollow section steel pipes. Specifically, the EN10210 standard covers structural hollow section steel pipes made of non-alloy and fine-grained steel materials for hot forming welding. These steel pipes are commonly used in building structures, bridges, mechanical manufacturing, equipment manufacturing, and other engineering applications.

EN10219 certification and EN10210 certification are European standards for steel pipe products, both of which have high quality standards and are widely used internationally. Both certifications are considered mandatory when manufacturing and selling steel pipe products. 

EN10219 and EN10210 certifications are important standards for European steel pipe products, ensuring high quality and reliability worldwide. This article emphasizes the differences between these certifications and their respective advantages in steel pipe production. 

EN10219 steel tubes are mainly used in structural applications such as construction, infrastructure development and building frames. While EN10210 steel tubes are widely used for manufacturing hollow sections and have a wide range of applications in mechanical engineering, automotive and other structural projects.

EN10219 and EN10210 steel pipes have different chemical compositions, which directly affect their mechanical properties. Compared with EN10210 steel pipe, EN10219 steel pipe usually has lower carbon, sulfur and phosphorus content. However, the exact chemical composition may vary depending on the specific grade and manufacturer.

Yield strength is the stress at which a material begins to exhibit plastic deformation. Compared to pipes under the EN10210 standard, steel pipes under the EN10219 standard usually do not have significantly higher yield strength. Therefore, it cannot be simply stated that EN10219 pipes have higher yield strength. In practical applications, these two types of pipes may have similar yield strength.

Tensile strength is the maximum stress that a material can withstand before fracture. In general, EN10210 steel pipes usually have high tensile strength, but it is not absolute. In specific cases, EN10219 steel pipes may also have tensile strength similar to or exceeding that of EN10210 steel pipes. When the pipeline needs to withstand higher tensile loads or pressures, the increased tensile strength is beneficial for EN10210 steel pipes.

The impact performance of steel pipes is crucial, especially in applications at low temperatures and harsh environments. It is generally believed that EN10210 steel pipe has excellent impact toughness, while EN10219 steel pipe may have relatively weak impact performance. However, the specific impact performance depends on factors such as the specific material composition, manufacturing process, and application environment of the steel pipe. Therefore, in industries that require high brittle fracture resistance, EN10210 steel pipes are often chosen. However, in specific circumstances, impact performance testing may be required to confirm whether the steel pipe meets the requirements.

EN10219 and EN10210 steel pipe can be manufactured using either hot forming or cold forming methods, depending on the actual requirements. 

From the picture in Figure 1, we can clearly see that the production process of EN10219 cold formed steel hollow section is much more simple than EN10210 hot formed steel hollow section. Yes, in some more demanding construction projects, the products usually supplied are EN10210 standard steel hollow sections. Instead of choosing EN10219 cold formed steel hollow sections. Among the thousands of projects supplied by Yuantai Derun, EN10210 steel pipe products are more trusted and favored by suppliers.

It is generally believed that when producing EN10219 cold formed hollow profiles, a certain amount of stress is retained in the steel during the forming process, which will cause the steel to harden to varying degrees, especially at corners and along welds. This will reduce the ductility of the steel and create weak points in the structure, along which cracks may form.

Normally, after placing a cold-formed steel hollow section in a heating furnace for heat treatment, it becomes an EN10210 steel pipe.

The amount of internal stress relief is closely related to temperature. When steel is heated to a lower temperature, it cannot produce new austenite and can only partially eliminate internal stress. When steel is heated to the austenite phase, it is what we call normalizing treatment. During the normalizing process, new austenite particle structures will be formed, and the internal stress reserved during the steel pipe forming process will be eliminated.

For welded steel pipes, internal stress may be one of the defects that cause pipe cracking. So, if people want to reduce the accident rate, they must eliminate the internal stress of the pipeline. By further normalizing processing, hard spots inside the steel pipe can be eliminated, achieving structural uniformity.

Usually, the carbon content of the hollow section of the structure does not exceed 0.22%。From the picture, we can clearly see that steel only enters the austenite phase when the temperature is above 850 ° C. So at this temperature, our hollow cross-section structure can achieve the best normalizing performance.

So, we can summarize the differences between EN10210 and EN10219 as follows:

1. The EN10219 standard is a standard for cold-formed steel hollow sections.

This is an experimental test result graph, where different colors represent different hardness test results. The specific minimum yield strength of the three hollow sections in the graph is 355 N/mm2. The three hollow sections have the same tensile strength, with the only difference being the production process and forming standards used.

EN10219 and EN10210 tubes have slightly different dimensional tolerances, which should be taken into account when selecting to ensure suitability for each application. 

In the figure, we can clearly see that there are many restrictions on the welding area of the cold formed EN10219, especially at the corners. However, the 100% welding area of EN10210 hot formed square steel pipes is not restricted.