EN 10216-5 1.4841 Stainless Steel Heat Exchanger Tube Seamless Pipe for High Temperature Applications

EN 10216-5 1.4841 Seamless Stainless Steel Pipe X15CrNiSi25-21 Heat Exchanger Tube

EN 10216-5 1.4841 is a seamless, round, austenitic stainless steel pressure tube in grade X15CrNiSi25-21, the European designation for what ASTM and ASME buyers call TP314 (UNS S31400). Tubes are hot pierced, cold finished and delivered solution annealed and pickled.

The decisive difference is silicon. Adding 1.5-2.5% Si to a 25% Cr / 20% Ni austenitic base forms a dense, self-healing oxide scale, which is why buyers specify 1.4841 rather than 310S or 309S. Continuous service in air is practical to roughly 1050-1100°C, with peaks near 1150°C, and sigma embrittlement progresses far more slowly than in standard 25/20 grades.

The grade solves a specific failure mode: 304 and 316 tubing scales above 800°C, shortening pressure-boundary life. 1.4841 keeps oxidation resistance and creep strength in one seamless wall, with no weld seam as a weak link.

Applications and Compliance

• Heat treatment and sintering furnaces: radiant tubes, muffle tubes, roller hearth rollers, fan shafts
• Petrochemical and syngas: reformer outlet pigtails, pyrolysis quench fittings, catalyst grid hardware
• Cement and lime kilns: burner pipes and kiln internals
• Glass and ceramic: bubblers, kiln furniture, saggar frames
• Power and waste-to-energy: superheater support tubes, soot-blower sleeves
• Instrumentation: thermocouple protection wells

Compliance note: 1150°C is an oxidation limit in clean air, not a pressurised design temperature. Allowable stress must come from the governing code, typically EN 13480, EN 12952/12953 or AD 2000-Merkblatt W10, which caps pressurised service well below that ceiling. Sulphur-bearing or reducing atmospheres lower the practical limit further, and 1.4841 is a heat-resistance grade, not a wet-corrosion grade.

Chemical Composition and Mechanical Properties

Mechanical properties, room temperature, solution annealed

Working range and grade cross-reference

Standards and Certification

• EN 10216-5:2021, seamless steel tubes for pressure purposes
• EN 10088-1 and EN 10095, grade and heat-resistant reference data
• ASTM A312/A312M and A999/A999M when dual marking is required
• PED 2014/68/EU documentation with AD 2000-Merkblatt W10
• EN 10204 3.1 mill test certificate standard, 3.2 on request

Every lot is released on chemical analysis, tensile and hardness testing, hydrostatic test or eddy current/ultrasonic inspection to EN ISO 10893-2 or -10, dimensional checks, and intergranular corrosion testing to EN ISO 3651-2 when specified. Third-party inspection by SGS, BV, TUV or Intertek can be arranged.

Packaging and Shipping

• Plastic end caps and anti-moisture wrap, braided sleeve for pickled surfaces
• Hexagonal bundles of 2-3 t with steel strapping and timber bearers
• Fumigation-free plywood cases or steel frames for sea freight
• Marking on every tube: standard, grade, heat number, size, heat treatment condition

Loading: 20GP about 22-25 t, 40GP about 24-26 t, and 12 m lengths need open-top or flat-rack. Ports of loading: Shanghai, Ningbo and Qingdao, with CIF and CFR against Incoterms 2020. HS codes are 7304.41 for cold-drawn and 7304.49 for other stainless seamless tube.

Frequently Asked Questions

1.4841 or 310S: which one should be ordered?

310S is the low-silicon 25/20 grade, relying on nickel and chromium alone. 1.4841 adds 1.5-2.5% Si for a denser scale, better carburisation resistance and less spalling, at the cost of weldability and low-temperature toughness. Above 1000°C, with thermal cycling, or where spalled oxide would contaminate the load, choose 1.4841.

Can the tube be used under internal pressure?

Yes, it is an EN 10216-5 pressure tube. Send working pressure, temperature and medium, and we return wall thickness calculated against the applicable design code.

Request a Quote

Send outside diameter, wall thickness, quantity, grade, delivery condition, length, operating temperature and pressure, and certificate requirement; a combined technical and commercial answer follows within 24 hours with MOQ, FOB price, lead time and packaging proposal.

Quality Control and Documentation

Heat number traceability runs from raw billet to finished tube. Each shipment carries an EN 10204 3.1 mill test certificate matching the stencilled heat number on every pipe, with chemical composition, tensile results and non-destructive test records. PED 2014/68/EU documentation and third-party inspection by SGS, BV, TUV or Intertek are available on request.

Why Buyers Standardise on This Grade

• One tube covers both the heat-resistance and the pressure-boundary requirement, removing a welded joint from the furnace
• Silicon-rich scale resists spalling, so furnace loads stay free of oxide contamination
• Dual EN and ASTM marking lets European and US drawings share a single stock item
• Seamless construction removes the longitudinal weld as a fatigue initiation site under thermal cycling