EN 10216-2 Steel Tube Buyer's Guide: P235GH, 16Mo3, 13CrMo4-5 & 10CrMo9-10 for High-Temperature Service

In a world where power plants, refineries, and petrochemical facilities run hotter and harder every year, the pipe behind the pressure boundary is rarely the place to economize. EN 10216-2 is the European standard that defines how seamless en10216-2 steel tube must be made, tested, and documented when the service is elevated-temperature pressure service — and it is the document that purchasing teams should be reading line-by-line before signing a mill-direct order for carbon & carbon alloy steel pressure components.

This guide is written for the buyer, EPC engineer, or procurement manager who is about to source P235GH, 16Mo3, 13CrMo4-5, 10CrMo9-10, or similar grades and needs a clear picture of what the standard actually requires, what the mill-direct supplier should be providing, and where the common pitfalls hide.

What EN 10216-2 Actually Covers

EN 10216-2:2013+A1:2019 is part of the seven-part EN 10216 family of seamless pressure-purpose tube standards, published by CEN (the European Committee for Standardization) and harmonized under the Pressure Equipment Directive 2014/68/EU. Specifically, EN 10216-2 covers seamless circular tubes made of non-alloy and alloy steels with specified elevated-temperature properties.

It sits between EN 10216-1 (room-temperature non-alloy grades) and EN 10216-3 (fine-grain alloy steels), and is the right standard to call out when the design metal temperature is above ambient and the tube must retain strength, creep resistance, and impact toughness under continuous heat. The 2024 revision (EN 10216-2:2024) is the most current edition at the time of writing; many EPC projects still reference 2013+A1:2019 on their data sheets, so the buyer should always confirm which version the design code is anchored to.

EN 10216 series at a glance: Part 1 — room-temp non-alloy • Part 2 — elevated-temp non-alloy & alloy (this article) • Part 3 — fine-grain alloy • Part 4 — low-temp non-alloy & alloy • Part 5 — stainless.

Why the EN 10216-2 Family Matters for Power, Refinery, and Boiler Buyers

Buyers searching for alloy steel tube or boiler tubing are usually dealing with one of three service profiles:

High-temperature headers, steam lines, and superheater tubes where the metal temperature sits between 350 °C and 580 °C for the life of the plant — the classic P235GH, 16Mo3, and 13CrMo4-5 territory.
Refinery and petrochemical furnace tubes, hot reheat lines, and ethylene cracker piping where creep and resistance to hydrogen attack drive the grade choice toward 10CrMo9-10 or higher.
Boiler components for waste-heat, biomass, and combined-cycle plants where short-term temperature peaks, frequent cycling, and weldability all have to be considered — the exact mix that EN 10216-2 was written to govern.

The standard sets the rules for two inspection categories (TC1 and TC2) with progressively more demanding testing, and it cross-references the testing standards (EN ISO 148-1 for Charpy impact, EN ISO 6892-1/-2 for tensile at room and elevated temperature, EN ISO 8492/-8493/-8495/-8496 for ring and flattening tests, and the EN ISO 10893 series for NDT). For a buyer, that cross-reference is a gift: every test on the MTC is traceable to a published method, so "tested per the standard" stops being a marketing line and starts being auditable.

The Steel Grades Buyers Most Often Specify

EN 10216-2 lists a wide range of non-alloy and alloy grades, but in real B2B orders a small handful dominates. The table below is the working set most procurement teams should be familiar with when sourcing from a mill-direct manufacturer.

Steel Name (EN 10027-1)	Material Number	Typical Use	Typical Service
P235GH	1.0345	Headers, steam piping, boiler components	Up to ~400 °C
P265GH	1.0425	Pressure vessels, higher-strength headers	Up to ~400 °C
16Mo3	1.5415	Superheater tubes, boiler drums, reformer outlets	Up to ~530 °C
13CrMo4-5	1.7335	Hot reheat, refinery furnace tubes	Up to ~560 °C
10CrMo9-10	1.7380	Power plant headers, steam piping at high pressure	Up to ~580 °C
11CrMo9-10 (under 2024 revision)	1.7383	Modern high-efficiency USC boilers	Up to ~600 °C
15NiCuMoNb5-6-4 (WB36)	1.6368	Large-diameter headers, hot reheat	Up to ~500 °C

A practical note for cross-standard procurement: the closest ASTM analogues for the P235GH / 16Mo3 / 10CrMo9-10 family sit inside ASTM A106 (carbon), A335 alloy steel tube (P11 ≈ 13CrMo4-5, P22 ≈ 10CrMo9-10), and ASME SA-335 for the equivalent pressure-boundary code work. If a project carries an ASME-stamp alongside PED, the mill-direct order is typically split: the same heat, two test programs, and a single MTC bundle that satisfies both regimes — something a mill accustomed to shipping to both Europe and North America will handle routinely.

TC1 vs TC2: The Inspection Category Decision

EN 10216-2 splits every order into one of two test categories. The difference is not the chemistry or the dimensions — it is the depth of batch testing the manufacturer must perform before the tube is released.

TC1 — the default for non-critical service

TC1 covers the standard mandatory test programme: cast analysis, product analysis, tensile test at room temperature, flattening or ring-expansion test, dimensional verification, and visual surface examination. Hydrostatic or equivalent NDT is performed lot by lot. For many B2B buyers ordering heat exchanger tube or non-PED steam lines, TC1 is the minimum and is often sufficient.

TC2 — when the service justifies more testing

TC2 adds additional batch tests: a high-temperature tensile test (typically at 300 °C or 400 °C, depending on the grade), an impact test on a sample per cast, and — in many grade tables — a creep or stress-rupture test on a per-cast or per-heat basis. TC2 is the right call for pressure-bearing components under the PED, for high-energy piping in power plants, and for anything that will see sustained operation above ~450 °C.

Practical tip: Specify TC1 or TC2 by name on the data sheet. "Tested per EN 10216-2" alone leaves the supplier free to deliver TC1, which can create costly change orders if the project engineer later requires TC2 evidence.

Mandatory Tests and What the MTC Should Show

A mill-direct shipment of EN 10216-2 tube arrives with a test certificate per EN 10204. For European pressure equipment, that almost always means a 3.1 certificate (issued by the mill's independent inspection representative) or, where the project demands it, a 3.2 certificate (with a third-party inspector countersignature). The certificate should list, at minimum, the items below for every heat and test unit.

Cast analysis and product analysis — full chemistry matching the grade in the standard, including residuals like S, P, Cu, Sn, As, Sb for hydrogen-resistance considerations on Cr-Mo grades.
Tensile test at room temperature — yield strength, tensile strength, elongation per EN ISO 6892-1.
Tensile test at elevated temperature (TC2) — yield strength at the design temperature per EN ISO 6892-2, used to verify the published 0.2 % proof strength curves.
Charpy V-notch impact test — three test pieces per direction, typically at 0 °C or -20 °C depending on the grade table, per EN ISO 148-1.
Flattening or ring-expansion test — per EN ISO 8492 (flattening) or EN ISO 8493/8495/8496 (ring tests), confirming ductility under deformation.
Hydrostatic test or equivalent NDT — each tube tested to a calculated pressure, or eddy-current / ultrasonic testing per EN ISO 10893 series as an alternative.
Dimensional and visual examination — outside diameter, wall thickness, straightness, surface condition, depth of surface imperfections (the standard caps the latter at 5 % of wall thickness or 3 mm, whichever is smaller, without grinding).
Heat treatment condition — normalizing, normalizing + tempering, or quenching + tempering, as called for in the grade table; this must match what the order specified.

For PED-classified equipment, the buyer should also expect the certificate to reference the PED category (I, II, III, or IV) and the relevant essential safety requirements the material supports.

Reading a 16Mo3 Data Sheet: A Worked Example

Because 16Mo3 is one of the most commonly specified EN 10216-2 grades for refinery and power plant work, it is worth walking through what a competent data sheet should look like. The numbers below are the published EN 10216-2:2013+A1:2019 limits; specific heat results should be checked against them on the MTC.

Property	EN 10216-2 Limit (16Mo3, 1.5415)	What it Means in Service
C	0.12 – 0.20 %	Strength and weldability balance
Mn	0.40 – 0.90 %	Solid-solution strengthening
Mo	0.25 – 0.35 %	Core high-temperature strength element
P / S (max)	0.025 / 0.010 %	Toughness and weldability control
Yield strength, room temp, ≤ 16 mm	≥ 275 MPa	Pressure-bounding design check
Tensile strength, room temp	440 – 590 MPa	Overall strength band
Elongation A (min)	22 %	Ductility for forming and field bending
Impact energy at +20 °C	≥ 31 J (longitudinal)	Toughness at ambient start-up
0.2 % proof at 400 °C	≥ 175 MPa	High-temperature design strength
0.2 % proof at 500 °C	≥ 147 MPa	Long-term creep margin

A common procurement mistake is to accept a 3.1 certificate that shows chemistry and room-temperature tensile only. For a 16Mo3 tube destined for a 480 °C superheater line, that is not enough: the 400 °C or 500 °C tensile evidence (TC2) is what verifies the design margin at operating temperature.

Sourcing the Right Diameter, Wall, and Length

EN 10216-2 tubes are produced as hot-finished or cold-finished seamless product. The two routes trade off against each other in a way the buyer should understand before placing the order.

Hot-finished seamless

Hot-finished tube is the workhorse route for outside diameters roughly 21.3 mm to 660 mm and wall thicknesses from ~2 mm up to ~100 mm. Tolerances per EN 10220 are wider than for cold-finished, but the grain structure and mechanical isotropy are well suited to high-temperature headers and pressure piping. For big diameter steel pipe linepipe crossover projects where EN 10216-2 is being specified for the heavy-wall segments, hot-finished is typically the only practical choice.

Cold-finished seamless

Cold-drawn or cold-rolled tube tightens the OD and wall tolerances, improves surface finish, and allows thinner walls for high-pressure heat exchanger tube service. The trade-off is a manufacturing route that can leave residual stresses, so the standard requires the finished tube to be supplied in a suitable heat-treated condition (typically normalizing or quenching + tempering, depending on grade).

Length, ends, and protection

Random length (typically 4–7 m) is standard for mill shipments. Project-specific fixed lengths (often 6 m, 9 m, or 12 m) are common for power plant prefabrication and can usually be accommodated at a mill with in-line cutting and bevelling. Ends are usually supplied plain-end or bevelled to a project drawing; plastic end caps protect the bore during transport. For tubes destined for hot-bending into u bend tube configurations, it is worth confirming with the mill that the chemistry and heat-treatment condition are compatible with the induction-bending temperature the fabricator will use.

EN 10216-2 vs EN 10216-5: When to Switch

A surprisingly common specification error is to call out EN 10216-2 for a tube that should be EN 10216-5 (stainless). The decision rule is straightforward but worth being explicit about.

Use EN 10216-2 when the material is a non-alloy or low-alloy steel (P235GH, 16Mo3, 13CrMo4-5, 10CrMo9-10) and the dominant design concern is strength at elevated temperature or creep resistance.
Use EN 10216-5 when the material is a stainless steel (typically 1.4301, 1.4401, 1.4571, or higher alloys) and the dominant design concern is corrosion resistance at temperature — feedwater heaters, superheater sections in chemical plants, etc.
Use both on a project when the boiler system combines carbon-moly headers (EN 10216-2) with stainless superheater pendants or reheater loops (EN 10216-5). This is a normal configuration and a mill-direct supplier will stock and ship both under the same quality system.

What a Good Mill-Direct Supplier Provides on Top of the Tube

Buying EN 10216-2 tube mill-direct is not only about the tube itself; it is about the package the mill attaches to it. The items below are what a B2B buyer should expect from a manufacturer set up for European pressure-equipment projects.

ISO 9001 quality system and PED-aligned manufacturing, with documented welding procedure specifications and welder qualifications for any attachment work (e.g., stub ends, nozzles).
Heat traceability — every tube marked with cast/heat number, tube number, dimensions, and steel grade, in a way that survives handling and storage.
3.1 or 3.2 MTC bundle with all the tests listed earlier, plus optional supplementary evidence (e.g., long-term creep data, ｄｒｏｐ-weight test, or specific customer-requested tests).
Project packaging and logistics — bundling, crating, container loading, and just-in-time delivery aligned to the EPC construction schedule.
Engineering support — help with grade selection between P235GH and 16Mo3, between 13CrMo4-5 and 10CrMo9-10, and with review of the project piping class before the order is released.
Bundled supply of pipe fittings, flanges, gaskets, stud bolts, and valves from the same manufacturer or coordinated supplier base, so the entire pressure boundary arrives as a single source-of-truth package.

Common Pitfalls When Buying EN 10216-2 Tube

A few recurring mistakes cost B2B buyers time, money, or both. The list below is the short version of what the field has taught over many years of mill-direct shipments.

Specifying the wrong part of the EN 10216 family. EN 10216-1 vs 2 vs 4 vs 5 each cover a different service envelope. Calling out "EN 10216" without a part number leaves the supplier guessing.
Letting TC1 ship on a TC2 project. A TC1 delivery is perfectly valid for some components but will not satisfy PED-classified pressure-bearing equipment. Lock the test category on the data sheet.
Accepting only room-temperature tensile for high-temperature service. The 400 °C or 500 °C tensile result is the one that confirms the design margin. Demand it on the MTC when the operating temperature is above ~350 °C.
Forgetting the heat-treatment condition. EN 10216-2 tubes must be supplied in the heat-treated condition called out in the grade table. A "hot-finished as-rolled" delivery on a 10CrMo9-10 header order is a non-conformance, not a shortcut.
Misreading "seamless" as a single manufacturing route. Hot-finished seamless and cold-finished seamless are different routes with different tolerance bands, different price points, and different suitability for cold-bending. Pick deliberately.
Buying fittings, flanges, and gaskets from a different supplier base than the tube. Mixed sources make heat traceability harder, complicate the MTC bundle, and slow project documentation reviews.

A Practical Sourcing Checklist

Before releasing an EN 10216-2 purchase order, the procurement team should be able to tick every box below.

Standard, part number, and year of publication called out (e.g., EN 10216-2:2013+A1:2019).
Steel name and material number specified (e.g., 16Mo3 / 1.5415).
Inspection category specified (TC1 or TC2).
Delivery condition specified (normalizing, normalizing + tempering, or quenching + tempering).
Test certificate type specified (EN 10204 — 3.1 or 3.2).
Outside diameter, wall thickness, length, and end finish specified.
NDT requirements specified (hydrostatic and/or EN ISO 10893 eddy current / ultrasonic).
Marking and packaging requirements specified (heat number on each tube, end caps, bundle size).
Project document references (PED category, ASME section if applicable, inspection and test plan) attached to the order.
Delivery schedule tied to EPC milestones (not a single open-ended shipment date).

Source EN 10216-2 Steel Tube from a Mill-Direct Manufacturer

EZ Steel Industrial supplies EN 10216-2 seamless tube in P235GH, P265GH, 16Mo3, 13CrMo4-5, 10CrMo9-10 and other grades, with full 3.1 / 3.2 MTC support, PED-aligned documentation, and bundled supply of pipe fittings, pipe flanges, and complementary project materials. For data-sheet review, grade selection, or a mill-direct quotation, contact the team at export@ezsteelpipe.com.