EN 10210, 10216, 10217, 10219, 10296 and 10297: which tube standard applies?

These six EN numbers are often confused because they can all describe steel tubes with overlapping dimensions. The fastest way to select the right family is not to start with seamless versus welded. Start with what the tube is designed to do.

The three questions

Ask in this order:

1. Application: structural, pressure, or mechanical/general engineering?
2. Manufacturing route: seamless or welded — and, where relevant, which welding route?
3. Material/service family: non-alloy, alloy, fine-grain, stainless, low-temperature, elevated-temperature, etc.?

That sequence eliminates most standard-selection errors.

The six-standard map

The structural distinction is covered in detail in EN 10210 vs EN 10219.

Decision 1: is it structural?

If the tube/hollow section is part of a load-bearing steel structure, EN 10210 or EN 10219 may be the relevant family.

• EN 10210 covers hot-finished structural hollow sections and can include both welded and seamless products.
• EN 10219 covers cold-formed welded structural hollow sections.

This is one of the most important misconceptions to avoid: EN 10210 does not mean “seamless.”

Decision 2: is it pressure-retaining tube?

If the product is selected as a pressure tube, move to the EN 10216 / EN 10217 families:

• EN 10216 — seamless pressure tube;
• EN 10217 — welded pressure tube.

Then choose the part from temperature/property/material family.

See EN 10216 series explained, EN 10217 series explained and EN 10216 vs EN 10217.

Decision 3: is it mechanical/general engineering tube?

If the tube is intended for mechanical components, machining or general engineering rather than pressure containment or a structural hollow-section application:

• EN 10296 — welded circular tube;
• EN 10297 — seamless circular tube.

See EN 10296 vs EN 10297.

Why welded/seamless should not be the first question

If you start with “I need seamless,” you still have at least three very different possibilities:

• seamless structural hollow section → potentially EN 10210;
• seamless pressure tube → EN 10216;
• seamless mechanical/general-engineering tube → EN 10297.

Likewise, “welded” can lead to EN 10210, EN 10219, EN 10217 or EN 10296 depending on application and process.

Worked examples

Example A — S355 structural CHS

The item is a load-bearing circular hollow section in a steel structure. Start with structural standards. Then determine whether EN 10210 or EN 10219 and the specified grade/delivery condition apply.

Do not redirect it to EN 10217 simply because the tube is welded.

Example B — stainless pressure tube

The product carries pressure and is stainless:

• seamless → consider EN 10216-5;
• welded → consider EN 10217-7.

The same material number can appear under both, but the product standard and manufacturing requirements differ.

Example C — seamless tube to be machined into a mechanical component

The primary purpose is mechanical/general engineering, not pressure. EN 10297 may be the relevant family even though the product is seamless.

Example D — low-temperature pressure tube

For seamless low-temperature pressure tube, EN 10216-4 is the relevant family. For welded low-temperature tube, the EN 10217 part depends on welding route, such as electric-welded versus SAW.

Same dimensions do not prove interchangeability

A 168.3 × 12.5 mm tube can potentially be manufactured under several different product standards. OD and wall thickness do not define the product's qualification.

Different standards can impose different:

• chemistry;
• yield/tensile/toughness properties;
• delivery condition;
• tolerances;
• weld requirements;
• NDT;
• test categories;
• conformity/certification rules.

So “same size and similar strength” is not enough for substitution.

What to do when the MTO is ambiguous

If an MTO says only:

PIPE / TUBE — S355 — 168.3 × 12.5

ask for:

1. intended service/application;
2. governing product standard;
3. seamless/welded route;
4. complete grade;
5. design temperature/pressure where relevant;
6. dimensional/tolerance standard;
7. certification and NDT requirements.

Do not select the standard from the word “pipe” or “tube” alone.

MetalMate takeaway

Application first, manufacturing route second, material/service family third. Structural: EN 10210/10219. Pressure: EN 10216/10217. Mechanical/general engineering: EN 10296/10297. That decision tree is more reliable than choosing a standard from seamless/welded terminology alone.

Related Knowledge

• EN 10210 vs EN 10219
• EN 10216 series explained
• EN 10217 series explained
• EN 10216 vs EN 10217
• EN 10296 vs EN 10297

References

• NEN, EN 10216-1:2013 — seamless pressure tubes: https://www.nen.nl/en/nen-en-10216-1-2013-en-190675
• NEN, EN 10217-1:2019 — welded pressure tubes: https://www.nen.nl/en/nen-en-10217-1-2019-en-258334
• CEN catalogue record, EN 10296-1:2003 — welded mechanical/general-engineering tubes: https://shop.standards.ie/en-ie/standards/en-10296-1-2003-329642_saig_cen_cen_758596/
• NEN, EN 10297-1:2003 — seamless mechanical/general-engineering tubes: https://www.nen.nl/en/nen-en-10297-1-2003-en-83443