What are the stainless steel grades covered under EN10296-2 welded steel tube specification?

What Stainless Steel Grades Does EN 10296-2 Cover for Welded Steel Tube?

EN 10296-2 is the European standard that sets the technical delivery conditions for welded circular steel tubes made from stainless steel for mechanical and general engineering purposes, rather than pressure service. For buyers sourcing EN 10296-2 welded steel tube, the first question is usually the same one: which stainless steel grades are actually covered? The answer shapes material selection, price, and whether a supplier can meet the application. This article maps out the full grade coverage so you can compare offers with confidence.

The Four Stainless Steel Families in EN 10296-2

The standard groups its grades into four families: ferritic, austenitic, austenitic-ferritic (duplex), and austenitic heat-resisting steels. In practice the commonly quoted range is around seven ferritic grades, seventeen austenitic grades, two to three duplex grades, and six austenitic heat-resisting grades. Every grade is identified by an EN steel name, for example X5CrNi18-10, and an EN steel number, such as 1.4301, following EN 10027-1 and CR 10260.

Ferritic Grades: Corrosion Resistance Without the Nickel Premium

Ferritic stainless steels are magnetic, low or nil in nickel, and offer good corrosion resistance and oxidation behaviour at moderate temperatures. Because many grades are stabilised with titanium or niobium, they weld cleanly without sensitisation problems. The ferritic grades in EN 10296-2 are:

• X2CrNi12 (1.4003)
• X2CrTi12 (1.4512, type 409)
• X6Cr17 (1.4016, type 430)
• X3CrTi17 (1.4510)
• X2CrMoTi18-2 (1.4521)
• X6CrMoNb17-1 (1.4526)
• X2CrTiNb18 (1.4509)

Types 409 and 430 are the most widely used ferritics for mechanical tubing, often found in automotive exhaust components where forming and weldability count as much as corrosion resistance.

Austenitic Grades: The Largest Group in the Standard

Austenitic grades form the bulk of the specification and are the obvious choice when you need a combination of corrosion resistance, toughness and ease of fabrication. They are non-magnetic and remain ductile down to cryogenic temperatures. The austenitic grades covered include the familiar 300-series types alongside several nitrogen-strengthened and special grades:

• X2CrNiN18-7 (1.4318)
• X5CrNi18-10 (1.4301, type 304)
• X2CrNi18-9 (1.4307, type 304L)
• X2CrNi19-11 (1.4306)
• X2CrNiN18-10 (1.4311, 304LN)
• X6CrNiTi18-10 (1.4541, type 321)
• X6CrNiNb18-10 (1.4550, type 347)
• X5CrNiMo17-12-2 (1.4401, type 316)
• X2CrNiMo17-12-2 (1.4404, type 316L)
• XCrNiMoTi17-12-2 (1.4571, 316Ti)
• X2CrNiMo17-12-3 (1.4432)
• X3CrNiMo17-13-3 (1.4436)
• X2CrNiMo18-14-3 (1.4435)
• X2CrNiMoN17-13-3 (1.4429)
• X2CrNiMoN17-13-5 (1.4439, type 317L)
• X1CrNiMoCu25-20-5 (1.4539)
• X1CrNiMoCuN20-18-7 (1.4547)

For everyday mechanical tubing, 304/304L and 316/316L are the workhorses. The low-carbon variants such as 304L and 316L are preferred where welded assemblies may be exposed to corrosive media, because they avoid the chromium-carbide precipitation that can otherwise weaken the weld zone. Where high yield strength is needed from an austenitic tube, the nitrogen-alloyed grades such as 1.4318 and 1.4311 provide a meaningful step up.

Duplex Grades: High Strength Paired With Corrosion Resistance

Austenitic-ferritic duplex grades combine a roughly balanced structure of austenite and ferrite, which delivers roughly double the proof strength of the austenitic grades plus strong resistance to stress corrosion cracking. The duplex grades in the standard are:

• X2CrNiN23-4 (1.4362, type 2304)
• X2CrNiMoN22-5-3 (1.4462, type 2205)
• X2CrNiMoN25-7-4 (1.4410, type 2507)

Of these, 2205 is the one most buyers specify, offering a good balance of cost, strength and corrosion performance for mechanical and structural service.

Austenitic Heat-Resisting Grades for Elevated Temperatures

Where the tube must keep its strength and resist oxidation at high temperature, the standard draws on the austenitic heat-resisting grades. Typical options include:

• X15CrNiSi20-12 (1.4828)
• X9CrNiSiNCe21-11-2 (1.4835)
• X12CrNi23-13 (1.4833)
• X8CrNi25-21 (1.4845)
• X6CrNiSiNCe19-10 (1.4818)
• X6NiCrSiNCe35-25 (1.4854)

Delivery Conditions, Tolerance and Testing

Understanding the grade list is only half the picture. EN 10296-2 also defines delivery conditions and process routes. Ferritic tubes can be supplied as-welded (+AR) or annealed (+A), while austenitic and duplex tubes are supplied as-welded (+AR) or solution annealed (+AT), and the product can be pickled on request. Routine verification covers the cast analysis, tensile testing, flattening, bend and weld-bend tests, dimensional inspection and visual examination. Where the spec calls for it, leak-tightness testing or non-destructive examination of the weld can be added as options.

How to Choose the Right Grade

Start with the service environment. For atmospheric or mildly corrosive mechanical duty at ambient temperature, a ferritic grade such as 430 keeps cost down. Where the tube will face humid, marine or chemically aggressive conditions, move to 304 or 316 austenitic. If the design is governed by section size rather than applied stress, a duplex grade lets you ｄｒｏｐ the wall thickness and save material. And if the assembly runs hot, one of the heat-resisting grades will hold mechanical properties that the standard austenitics cannot.

Sourcing EN 10296-2 Stainless Tube From a Verified Supplier

Because EN 10296-2 covers dozens of grades, a supplier that stocks only one or two of them will quickly limit your material choice. When you source stainless steel tube from a full-range manufacturer, you keep the freedom to move between ferritic, austenitic, duplex and heat-resisting grades as the project evolves. EZ Steel Industrial combines stainless steel production lines with hydrostatic and ultrasonic testing, positive material identification and mill certificate traceability, so grade verification and dimensional conformity are documented rather than assumed. For requirement-specific guidance on matching an EN 10296-2 grade to your application, contact the sales team with the outer diameter, wall thickness, length and intended service condition.