How do you ｓｅｌｅｃｔ the appropriate grade of EN10216-2 steel tube for pressure equipment?

Choosing the right EN 10216-2 grade is one of the most consequential decisions in a pressure-equipment project. The standard covers seven widely used carbon and alloy steel grades, each engineered for a specific combination of temperature, pressure, and creep exposure. The wrong pick can shorten service life, void PED compliance, or trigger costly reweld work. This guide walks you through the practical decision path our engineers use every day with EPC contractors, boiler makers, and refinery purchasers.

What EN 10216-2 Actually Covers

EN 10216-2 is the European standard for seamless steel tubes used in pressure purposes with specified elevated-temperature properties. It applies to tubes with a circular cross-section delivered in two test categories: TC1 (basic) and TC2 (enhanced, with impact testing and full EN 10204 3.1 mill certification). For most power, boiler, and refinery projects that fall under PED 2014/68/EU, TC2 is the default.

The standard lists seven principal grades in three families:

Non-alloy (carbon-manganese): P195GH, P235GH, P265GH
Mo and Mo-V alloy: 16Mo3, 14MoV6-3
Cr-Mo alloy: 13CrMo4-5, 10CrMo9-10

Each family delivers progressively higher allowable stress as design temperature rises, which is why grade selection should start with the operating envelope, not the catalogue.

Step 1: Lock Down the Design Envelope

Before comparing grades, gather four numbers from the project team:

Maximum design temperature (°C)
Design pressure and required design stress
Fluid or process medium (steam, hydrocarbon, hydrogen, amine, etc.)
Required service life and any cyclic or peak-load conditions

These four inputs narrow the candidate grades immediately. For example, an economizer operating at 350°C saturated steam has very different needs from a primary superheater at 560°C with hot-spot excursions above 580°C.

Step 2: Match Grade to Temperature Family

Up to about 400°C — P195GH, P235GH, P265GH

The non-alloy grades cover the bulk of low-to-mid temperature pressure service. P235GH is the workhorse: feedwater lines, auxiliary steam piping, compressed air, and general process piping on packaged boilers. P265GH adds margin where pressure ratings or wall-thickness constraints push toward the upper yield limit. Both are widely stocked in our carbon and carbon alloy steel inventory in sizes from 10.2 mm OD through 720 mm OD.

400°C to 500°C — 16Mo3 and 14MoV6-3

Once the design temperature crosses roughly 430°C, plain carbon grades lose allowable stress rapidly and the molybdenum-bearing grades take over. 16Mo3 is the most common choice for boiler headers, superheater loops, and steam piping up to about 530°C. It has long pedigree in DIN 17175 and is well accepted across EU, Middle East, and Asian EPC specifications. 14MoV6-3 adds vanadium for improved creep strength at the upper end of the range and is often used in high-pressure steam piping where wall thickness must be kept modest.

500°C to 600°C and above — 13CrMo4-5, 10CrMo9-10

Chromium-molybdenum grades are specified for high-temperature headers, main steam lines, hot reheat lines, and refinery heater tubes operating continuously in the 500–600°C band. 13CrMo4-5 (roughly the legacy 13CrMo44) covers the 500–560°C range. 10CrMo9-10 (the 10CrMo910 family) is the standard choice above 560°C and is frequently called out for superheater and reheater loops on utility boilers. If your project approaches ultra-supercritical territory above 600°C, discuss X10CrMoVNb9-1 (T91/P91) as a step up.

Step 3: Check the Medium, Not Just the Temperature

Two equipment items with identical temperature and pressure ratings can still need different tubes because of the fluid. A few common cases we see:

Hydrogen service at elevated temperature: 16Mo3 and the Cr-Mo grades offer much better resistance to hydrogen attack than plain carbon grades. Specification should always include any hydrogen partial pressure data.
Sour H2S service or amine units: Hardness control and NACE requirements often drive supplementary testing beyond what EN 10216-2 mandates by default. Confirm the test category and any project-specific supplemental requirements at the inquiry stage.
Wet steam or condensate cycles: Consider oxidation resistance and the impact of start-up/shutdown cycling. 13CrMo4-5 and 10CrMo9-10 generally outperform carbon grades under repeated thermal cycling.

Step 4: Decide on Test Category and Certification

EN 10216-2 offers two inspection levels:

TC1 covers the basic chemical and tensile tests. It is acceptable for non-PED Category I equipment or low-hazard service.
TC2 adds impact testing at 0°C, more extensive NDT, hydrostatic testing on every length, and a 3.1 mill test certificate with full traceability. Almost every boiler, power, and refinery EPC specification we receive requires TC2.

For PED Category II, III, and IV pressure equipment, plan on TC2. Confirm whether the project also requires 3.2 certification witnessed by an independent third party (TÜV, BV, DNV, LR) — this is standard for many EU and offshore projects and affects lead time.

Step 5: Specify the Delivery Condition and Dimensional Envelope

Most EN 10216-2 grades are supplied normalized (N) or normalized plus tempered (NT). The Cr-Mo grades are almost always NT to achieve the required impact values. Quenched and tempered (QT) is used for the higher-strength normalized fine-grain steels (P355N / P355NH / P460N family) when thicker walls are needed for high-pressure design.

Dimensional envelope: outer diameter 10.2 mm to 720 mm and wall thickness 1.2 mm to 12 mm is the typical stocked range. Tolerances follow EN 10216-2 Table 4 and Table 5: ±1% on OD (with a 0.5 mm minimum) and ±12.5% to ±20% on wall thickness depending on the T/D ratio. For tube sheets and machined fittings, tighter tolerances on OD may be required and should be called out at RFQ.

A Quick Selection Matrix

Application / Service	Typical Design Temperature	Recommended Grade
Feedwater and auxiliary steam lines	≤ 400°C	P235GH / P265GH
Industrial boiler headers, economizer inlets	400–480°C	16Mo3
Primary superheater loops	480–540°C	16Mo3 or 14MoV6-3
High-temperature headers, main steam piping	520–580°C	13CrMo4-5
Reheater and final-stage superheater tubes	560–600°C	10CrMo9-10
Refinery furnace tubes, high-pressure process	500–620°C	10CrMo9-10 or X10CrMoVNb9-1

Common Selection Mistakes to Avoid

Specifying P235GH for sustained service above 430°C. The allowable stress falls off and creep becomes a real risk within the design life.
Choosing TC1 on a PED Category II or higher project to save cost. Most notified bodies will reject the paperwork.
Using 16Mo3 where the medium contains hydrogen at elevated pressure without checking the Nelson curve. 16Mo3 has limits in hydrogen service that Cr-Mo grades handle better.
Forgetting the impact requirement at 0°C. EN 10216-2 mandates 27 J minimum transverse at 0°C for TC2. If your fabrication yard is in a colder climate, discuss sub-zero impact with your supplier.

How We Support EN 10216-2 Sourcing at EZ Steel Industrial

EZ Steel Industrial supplies EN 10216-2 seamless tubes from our three production and stocking hubs — Cangzhou for alloy inventory and custom fittings, Yangzhou for large-scale carbon and alloy pipe production, and Lishui for stainless and copper-nickel materials. We deliver tubes with full EN 10204 3.1 or 3.2 mill certification, hydrostatic testing, ultrasonic testing, and PMI on every heat when the project requires it.

Our project package covers more than the tube itself. We routinely bundle pipe fittings, pipe flanges, gaskets, stud bolts, and matching industrial valves so the metallurgical system stays consistent from the boiler outlet to the process connection. For elevated-temperature service, we also cross-reference against ASTM A335 alloy steel pipes and A192 / A179 boiler and heat-exchanger tubes when projects mix ASME and EN specifications.

Sending an Inquiry That Gets a Fast, Accurate Quote

To get a useful technical and commercial response from any EN 10216-2 supplier, send the following in your RFQ:

Grade (or the design envelope if you are open to recommendation)
Outer diameter, wall thickness, and length or random length
Quantity in metric tonnes or pieces
Test category (TC1 or TC2) and certification level (3.1 or 3.2)
End finishing, surface treatment, and any required NDT
Delivery condition and any project-specific supplemental requirements

If you already have an existing EN 10216-2 specification or a referenced standard list, attach it. Our engineering team will return a grade confirmation, a deviation list if any item cannot be met, and a lead time based on current mill scheduling.

Send your inquiry to export@ezsteelpipe.com or call +86 731 8870 6116, and we will route it to the right production hub within one working day.