How does EN10216-5 steel tube differ from EN 10216-2 and EN 10217-7 standards?

European standards EN 10216 and EN 10217 are often mentioned together, yet they address fundamentally different tube categories. EN 10216 covers seamless steel tubes for pressure purposes, while EN 10217 covers welded steel tubes for the same service environment. Within each family, a part number further defines the material group. EN 10216-5 is the stainless-steel part of the seamless family, EN 10216-2 is the non-alloy and alloy part, and EN 10217-7 is the stainless-steel part of the welded family. Knowing exactly which part to call out in a purchase order saves time on material selection, prevents mismatched certifications, and keeps projects aligned with PED 2014/68/EU.

Where EN 10216-5 Fits in the EN 10216 Family

EN 10216 is a multi-part standard. Part 2 covers non-alloy and alloy steels with specified elevated-temperature properties, and Part 5 covers austenitic stainless steels. Both parts require a seamless manufacturing route, mandatory solution annealing for the austenitic grades, and full traceability through EN 10204 Type 3.1 or 3.2 inspection certificates.

In practice, when a specification calls for EN 10216-5, the buyer is committing to a stainless steel tube made without a weld seam, intended for pressure equipment such as boilers, superheaters, condensers, and process piping that sees sustained high temperatures or corrosive media. Common grades covered by EN 10216-5 include 1.4301 (304), 1.4307 (304L), 1.4401 (316), 1.4404 (316L), 1.4541 (321), 1.4571 (316Ti), 1.4539 (904L), 1.4462 (2205 duplex), and high-temperature grades such as 1.4919 and 1.4958/1.4959 (Alloy 800H/800HT).

EN 10216-5 vs. EN 10216-2: Seamless, but Two Different Material Worlds

Both standards are seamless pressure tubes, yet the design intent, mechanical envelope, and corrosion behavior are different. The table below maps the most common decision points.

Item	EN 10216-2 (seamless)	EN 10216-5 (seamless)
Material family	Non-alloy and alloy steels (ferritic)	Austenitic and duplex stainless steels
Typical grades	P195GH, P235GH, P265GH, 16Mo3, 13CrMo4-5, 10CrMo9-10, X10CrMoVNb9-1 (P91)	1.4301, 1.4307, 1.4401, 1.4404, 1.4462, 1.4539, 1.4571, 1.4958/1.4959
Primary service	Elevated-temperature strength, creep resistance	Corrosion resistance plus elevated-temperature strength
Mandatory heat treatment	Normalizing, normalizing plus tempering, or quenching and tempering depending on grade	Solution annealing for austenitic grades
Typical temperature range	Up to about 600 °C for advanced Cr-Mo-V-Nb grades (P91/P92)	Continuous service commonly up to about 550–800 °C depending on grade; duplex typically limited to around 250–300 °C
Corrosion behavior	Prone to oxidation and hydrogen attack; needs alloying or cladding for aggressive media	Designed for oxidizing, mildly reducing, and chloride-bearing environments
Common applications	Boiler tubes, superheaters, reheaters, power-plant headers, refinery furnace piping	Boiler and superheater tubes in chemical and petrochemical plants, heat exchangers, condensers, food and pharma process lines
Inspection certificate	EN 10204 Type 3.1 (TC1/TC2)	EN 10204 Type 3.1 or 3.2; intergranular corrosion test is often added
Closest ASTM/AISI reference	ASTM A106, A335 (P11/P22/P91/P92)	ASTM A213 (TP304/TP316L), A312

A useful rule of thumb: choose EN 10216-2 when the design is driven by creep strength at temperature, and choose EN 10216-5 when the design is driven by corrosion resistance with adequate high-temperature strength. In combined-service projects such as utility waste-heat boilers handling flue-gas condensation, EN 10216-5 is often specified for the cooler, condensate-prone sections while EN 10216-2 covers the high-temperature evaporative sections.

EN 10216-5 vs. EN 10217-7: Same Steel Family, Different Manufacturing Route

EN 10216-5 and EN 10217-7 are frequently confused because they both target austenitic stainless steels for pressure service. The key difference is the production process. EN 10216-5 requires a seamless tube, while EN 10217-7 permits welded tube manufacture, with the weld zone subject to specific testing and, in most cases, a solution-anneal step to restore corrosion resistance in the heat-affected zone.

Item	EN 10216-5	EN 10217-7
Manufacturing route	Seamless (hot- or cold-finished)	Welded (with or without filler metal), solution annealed
Standard family	EN 10216 – seamless pressure tubes	EN 10217 – welded pressure tubes
Steel family	Austenitic, duplex, and high-temperature stainless steels	Austenitic stainless steels; duplex grades are included in dedicated sub-parts
Common grades	1.4301, 1.4307, 1.4401, 1.4404, 1.4462, 1.4571, 1.4539	1.4301, 1.4307, 1.4401, 1.4404, 1.4541, 1.4571, 1.4462
Typical size envelope	Limited by seamless mill capability, often up to around 610 mm OD depending on producer	Broader OD/wall range because welded forming is more flexible; commonly up to about 508 mm OD
Weld integrity	Not applicable (no weld)	Weld must meet EN 10217-7 testing (eddy current or ultrasonic, hydrostatic option)
Typical cost driver	Higher base cost due to seamless process	Generally more economical for larger diameters and thinner walls
Common applications	High-pressure, high-temperature, and safety-critical service; refineries, chemical plants, nuclear auxiliary systems	Process piping, heat exchangers, condensers, water-treatment and desalination lines, low- to medium-pressure service

For most process-piping and heat-exchanger tubing where the duty is medium pressure and the environment is corrosive rather than creep-limited, EN 10217-7 stainless steel tubes are the practical and economical choice. When the service combines high pressure, high temperature, and a critical safety function, seamless EN 10216-5 is the conservative specification.

Material Grades That Often Appear in All Three Standards

Stainless grade families can be specified under more than one of these standards, but the testing, traceability, and delivery condition change with the standard. The table below shows the most common grades and their typical standard fit.

Material No.	EN name	AISI/UNS	Typical use under EN 10216-2	Typical use under EN 10216-5	Typical use under EN 10217-7
1.4301	X5CrNi18-10	304	Not typical	General pressure and process tubing	Process and utility piping
1.4307	X2CrNi18-9	304L	Not typical	Welded fabrication, lower carbon to avoid sensitization	Welded systems needing low carbon
1.4401	X5CrNiMo17-12-2	316	Not typical	Higher-chloride or process-side service	Marine, chemical, and water service
1.4404	X2CrNiMo17-12-2	316L	Not typical	Welded construction with improved corrosion resistance	Pharma, food, and process industries
1.4462	X2CrNiMoN22-5-3	2205	Not typical	Higher strength and chloride resistance	Duplex process piping (per the relevant sub-part)
1.4571	X6CrNiMoTi17-12-2	316Ti	Not typical	Higher-temperature stainless service	Stabilized grade for welded systems
1.4539	X1NiCrMoCu25-20-5	904L	Not typical	Sulfuric and strong reducing media	Selected chemical duties
1.4958 / 1.4959	X6NiCrNb32-27 / X8NiCrAlTi32-21	Alloy 800H / 800HT	Not typical	Petrochemical furnace and ethylene cracking service	Not typical
P265GH	—	—	Boilers, headers, steam lines up to about 400–450 °C	Not applicable	Not applicable
16Mo3	—	—	Power-plant piping, superheater tubes	Not applicable	Not applicable
10CrMo9-10	—	—	Headers and piping in refineries and power plants	Not applicable	Not applicable
X10CrMoVNb9-1 (P91)	—	—	Ultra-supercritical boiler tubes, headers, and steam piping	Not applicable	Not applicable

It is worth highlighting that the alloy steels under EN 10216-2 have no direct equivalent in EN 10216-5 or EN 10217-7. If a specification calls for 16Mo3, 10CrMo9-10, or P91, the only valid standard among the three is EN 10216-2. Conversely, when 1.4404 or 1.4462 is required, EN 10216-5 (seamless) or EN 10217-7 (welded) are the matching routes.

How to Choose Between the Three Standards

Use this simplified decision flow when writing a tube specification:

If the tube must carry a corrosive medium and the duty is medium pressure with low-to-moderate temperature, start with EN 10217-7 welded stainless tube. It offers the broadest size range and the most competitive cost for general process and utility service.
If the service adds high pressure, high temperature, or a safety-critical function that cannot tolerate weld integrity risk, switch to EN 10216-5 seamless stainless tube. The seamless route removes the weld as a potential failure point and is typically required for boiler, superheater, and refinery furnace tubes.
If the design is driven by creep strength at temperature and the medium is not aggressively corrosive, choose EN 10216-2. The Cr-Mo and Cr-Mo-V-Nb grades (13CrMo4-5, 10CrMo9-10, P91/P92) remain the mainstream choice for utility boilers up to 600 °C and above.
For duplex stainless service, both EN 10216-5 and EN 10217-7 cover 1.4462 (2205). The choice between them follows the same seamless-versus-welded logic as for austenitic grades, with the additional note that duplex tubes are normally limited to about 250–300 °C to avoid precipitation of detrimental phases.

Practical Specification Tips

Always state the part number, not just "EN 10216" or "EN 10217". EN 10216 alone is incomplete; the buyer must specify -2, -5, or another applicable part.
Match the inspection level to the consequence of failure. TC2 in EN 10216-2 and the equivalent enhanced testing option in EN 10216-5 / EN 10217-7 are worth specifying for boiler and pressure-vessel service.
For intergranular corrosion resistance in welded austenitic systems, prefer low-carbon or stabilized grades (1.4307, 1.4404, 1.4571) and request a Strauss or similar test per EN ISO 3651-1/-2.
Confirm the delivery condition in the purchase order. EN 10216-5 austenitic tubes are normally supplied in the solution-annealed condition; EN 10216-2 alloy tubes are often supplied normalized, normalized and tempered, or quenched and tempered depending on grade.
Require EN 10204 Type 3.1 or 3.2 certification. For nuclear, offshore, or other high-criticality applications, Type 3.2 with independent third-party inspection is recommended.

How EZ Steel Industrial Supports All Three Standards

EZ Steel Industrial supplies tubes under all three standards from its three production bases. Seamless EN 10216-2 tubes for power-plant and refinery headers are produced in the Yangzhou facility, with grades covering P195GH through P91 and P92. Seamless EN 10216-5 austenitic and duplex stainless tubes come from the Lishui facility, with solution annealing, hydrostatic testing, eddy current or ultrasonic inspection, and full EN 10204 Type 3.1 documentation. Welded stainless steel pressure tubes under EN 10217 family specifications are also available, including common austenitic and duplex grades for process and heat-exchanger service.

Each shipment is accompanied by a mill test certificate, full traceability records, and optional third-party inspection reports. The engineering team can help match the correct part of EN 10216 or EN 10217 to the operating pressure, temperature, and medium of a given project, and can recommend the most cost-effective route when both seamless and welded options are technically acceptable.

For quotation requests, datasheets, or technical clarification on grade selection between EN 10216-5, EN 10216-2, and EN 10217-7, contact the EZ Steel Industrial export team at export@ezsteelpipe.com or call +86 731 8870 6116.