How does EN10216-2 steel tube differ from EN10216-1 and EN10216-5 standards?

EN 10216 is one of the most widely used European standard families for seamless pressure tubes, and procurement engineers regularly need to choose between its three most common parts: EN 10216-2 steel tube for elevated-temperature service, EN 10216-1 for room-temperature service, and EN 10216-5 for stainless pressure service. Although the three parts share the same overall title, they differ significantly in material group, test regime, intended application, and certification. Picking the wrong part in an RFQ usually causes re-orders, audit findings, or premature in-service failure. This guide walks through what each part actually covers, where they overlap, and how to specify them with confidence.

What the EN 10216 Family Actually Covers

EN 10216 is published by CEN (the European Committee for Standardization) and applies to seamless circular steel tubes used in pressure equipment. It is divided into seven parts, each focused on a different material class and service temperature window. For most industrial buyers, only three parts come up in real projects:

• EN 10216-1 – Non-alloy steel tubes with specified room-temperature properties.
• EN 10216-2 – Non-alloy and alloy steel tubes with specified elevated-temperature properties.
• EN 10216-5 – Austenitic and austenitic-ferritic stainless steel tubes for pressure and corrosion service.

The other parts (10216-3 for fine-grain alloy steels, 10216-4 for low-temperature service, and 10216-6/7 for sub-stainless and limted-end-use applications) address more specialized cases and are not part of this comparison.

EN 10216-1: The Workhorse for Ambient-Temperature Pressure

EN 10216-1 covers unalloyed carbon-manganese steels such as P195TR1, P195TR2, P235TR1, P235TR2, P265TR1, and P265TR2. The "TR1" and "TR2" suffixes refer to two inspection categories:

• TR1 – Basic conformity testing. Visual, dimensional, and hydrostatic checks are mandatory, but impact testing is not required.
• TR2 – Stricter conformity testing. Charpy V-notch impact tests at 0 °C are mandatory, and non-destructive testing is required on each tube.

Typical applications include utility water lines, compressed air systems, low-pressure process headers, and structural pressure components. The standard caps manganese at around 1.40 % and does not require micro-alloying, so these grades are not intended for sustained high-temperature exposure. If a tube will see continuous service above 350 °C, EN 10216-1 is the wrong choice and you will typically be redirected to EN 10216-2.

EN 10216-2: Elevated-Temperature Carbon and Alloy Steels

EN 10216-2 is the most commonly specified part of the family because it is the default for boilers, superheaters, refineries, and power plant piping. It includes both unalloyed grades (P195GH, P235GH, P265GH) where "GH" denotes guaranteed elevated-temperature properties, and a set of creep-resistant alloy grades such as 16Mo3 alloy steel tube, 13CrMo4-5, 10CrMo9-10, and 14MoV6-3.

The defining features of EN 10216-2 are:

• Mandatory elevated-temperature yield strength – The standard publishes minimum yield values at temperatures up to 400 °C and above, not just at room temperature.
• Creep-resistant alloying – Chromium and molybdenum additions (for example 2.25 Cr – 1 Mo in 10CrMo9-10) stabilize carbides at grain boundaries and resist long-term deformation under sustained stress.
• Heat-treatment requirements – Most grades must be supplied in the normalized (+N) or quenched-and-tempered (+QT) condition. Delivery in the as-rolled condition is generally not acceptable.
• EN 10216-2 2024 testing updates – The latest revision tightens requirements for tensile testing at elevated temperature, hydrostatic testing, and NDT coverage, with clearer traceability rules for batch-based impact testing.

Because of these additional controls, EN 10216-2 tubes are widely used in JIS G 3461 carbon steel tube for boilers and similar boiler and heat-exchanger service, petrochemical reactor coils, and refinery furnace piping. When a fabricator asks for "P265GH" or "16Mo3" without naming a part, they almost always mean EN 10216-2.

EN 10216-5: Stainless Steel Tubes for Pressure and Corrosion Service

EN 10216-5 leaves the carbon and low-alloy territory of parts 1 and 2 behind. It covers austenitic stainless steels (1.4301, 1.4401, 1.4571) and austenitic-ferritic (duplex) grades such as 1.4462. The test categories are renamed "TC1" and "TC2," but they work the same way as TR1/TR2: TC1 is a basic inspection regime and TC2 adds mandatory impact testing and full NDT on every tube.

Key points of difference from EN 10216-2:

• Material – Chromium content is at least ~16 % in austenitic grades and even higher in duplex, so corrosion resistance replaces creep strength as the primary design driver.
• Test scope – Intergranular corrosion testing (per EN ISO 3651-2) is often specified, and solution-annealing is typically required after final cold working.
• Typical service – Chemical processing, food and pharma piping, seawater systems, and high-purity process lines. You can also use EN 10216-5 seamless stainless steel tube in heat exchangers when the process fluid would corrode a carbon-steel tube.

Side-by-Side Comparison

How to Choose the Right Part for Your Project

A short decision routine usually clears up the choice:

1. Identify the service temperature window. Continuous service below ~350 °C with no corrosion concern → EN 10216-1. Continuous service above ~350 °C in boiler or refinery service → EN 10216-2. Corrosive media, hygienic service, or seawater → EN 10216-5.
2. Lock the inspection category. For PED-conformant pressure equipment, TC2 (or TR2) is generally the safer default, because it forces full NDT and impact verification on every batch.
3. Confirm the test regime in writing. The 2024 updates to EN 10216-2 tightened elevated-temperature tensile testing, hydrostatic testing, and NDT coverage. Make sure the mill test certificate reflects the latest edition and not an obsolete version.
4. Match the supply base. Pick a manufacturer that actually produces all three parts if your project mixes carbon and stainless pressure lines. This keeps documentation, traceability, and welding procedure qualification consistent across the package.

Why the Supply Base Matters

Specifying the standard is only half the job. The next risk is finding a mill that can deliver all three parts with the documentation your inspector will accept. A combined supplier that holds EN 10216-1, EN 10216-2, and EN 10216-5 production at the same facility, with shared QA and a single point of contact for MTCs, saves weeks of coordination on multi-discipline projects.

For buyers sourcing carbon and alloy pressure tubes, EZ Steel's carbon and carbon alloy steel range covers EN 10216-1 P195TR1/TR2 through P265TR1/TR2 and the full EN 10216-2 family including P235GH, P265GH, 16Mo3, 13CrMo4-5, and 10CrMo9-10 in normalized or quenched-and-tempered delivery. For stainless service, the stainless steel pressure and pipeline program includes EN 10216-5 austenitic and duplex grades with full TC1/TC2 testing. Bundling all three under one supplier keeps your RFQ, MTC, and inspection plan aligned from inquiry to site delivery.