EN 10216-5 Stainless Steel Seamless Coil Tube for Pressure Applications

Product Overview

The EN 10216-5 Stainless Steel Seamless Coil Tube is a premium-grade seamless pressure tube manufactured to the stringent requirements of the European standard EN 10216-5 — "Seamless tubes for pressure purposes — Part 5: Technical delivery conditions for stainless steel tubes." Produced by Wenzhou Jixing Metal Materials Co., Ltd, this coil tube is specifically engineered for critical pressure-containing equipment and piping systems where reliability, corrosion resistance, and long-term structural integrity are paramount.

Designed to comply with the European Union Pressure Equipment Directive (PED) 2014/68/EU, this product is suitable for integration into Category I through IV pressure equipment, providing a seamless solution for industrial, process, and energy sectors operating under European regulatory frameworks. The tube is available in two test category classifications — TC1 and TC2 — allowing end users to select the appropriate level of testing and assurance based on their application's criticality and safety requirements.

Material & Properties

Material Grades

EN 10216-5 specifies a range of austenitic, ferritic, and duplex stainless steel grades suitable for pressure service. The most commonly available grades include:

1.4301 (X5CrNi18-10 / 304) — General-purpose austenitic stainless steel with excellent corrosion resistance and formability
1.4401 (X5CrNiMo17-12-2 / 316) — Molybdenum-enhanced austenitic grade offering superior resistance to pitting and crevice corrosion
1.4571 (X6CrNiTi18-10 / 321) — Titanium-stabilized austenitic grade resistant to intergranular corrosion at elevated temperatures
1.4307 (X2CrNi19-11 / 304L) — Low-carbon variant suitable for welding applications without sensitization risk
1.4404 (X2CrNiMo17-12-2 / 316L) — Low-carbon 316 variant for welded pressure equipment

Mechanical Properties

Depending on the selected grade and tube dimensions, the following mechanical characteristics are guaranteed:

Tensile Strength (R_m): 520 – 730 MPa (75,400 – 105,900 psi), varying by grade and wall thickness
Yield Strength (R_p0.2): ≥ 205 – 310 MPa (29,700 – 44,950 psi)
Elongation (A): ≥ 35% – 50% (depending on grade and condition)
Hardness: ≤ 220 HV10 (annealed condition), ≤ 250 HBW (as supplied)
Operating Temperature Range: -196°C to +700°C (depending on grade selection)

Corrosion Resistance

The austenitic stainless steel grades specified under EN 10216-5 provide outstanding resistance to atmospheric corrosion, organic acids, dilute mineral acids, and chloride-containing environments. The addition of chromium (≥ 17%), nickel (≥ 8%), and in the case of 316/316L grades, molybdenum (≥ 2%), creates a robust passive oxide layer that protects the tube interior and exterior surfaces under demanding service conditions.

Specifications

Parameter	Specification
Governing Standard	EN 10216-5
Product Type	Seamless Stainless Steel Coil Tube
Test Category	TC1 (Hydrostatic Test) / TC2 (Hydrostatic Test + Additional NDT)
Outer Diameter (OD)	6.0 mm – 60.3 mm (0.24 in – 2.37 in)
Wall Thickness	0.5 mm – 6.0 mm (0.020 in – 0.236 in)
Coil Length	Up to 5,000 m (16,404 ft) per coil
Material Grades	1.4301, 1.4401, 1.4571, 1.4307, 1.4404, and other EN 10216-5 listed grades
Surface Finish	Pickled and Passivated (Standard) / Custom finish available
Delivery Condition	Annealed (A), Annealed and Pickled (AP), or as otherwise specified
PED Compliance	2014/68/EU — Suitable for Categories I–IV
Hydrostatic Test Pressure	1.5 × Maximum Allowable Pressure (per EN 10216-5)
Dimensional Tolerance (OD)	±0.10 mm (±0.004 in) for OD < 15 mm; ±0.15 mm (±0.006 in) for OD ≥ 15 mm
Dimensional Tolerance (Wall)	±10% of nominal wall thickness
Welding Suitability	All listed grades are fully weldable without preheating (for standard wall thicknesses)

Test Categories — TC1 and TC2

EN 10216-5 defines two distinct test category classifications to accommodate varying levels of safety assurance required by end applications:

TC1 — Hydrostatic Testing

Every coil is subjected to a full-length hydrostatic pressure test at a minimum pressure of 1.5 times the maximum allowable working pressure
Visual inspection of all tube ends and surface for defects
Suitable for general industrial pressure applications where moderate safety margins are acceptable
Appropriate for PED Category I and II equipment

TC2 — Enhanced Testing with Non-Destructive Examination

All TC1 requirements apply, plus additional non-destructive testing (NDT) methods
100% eddy current testing or ultrasonic testing along the full coil length to detect surface and subsurface discontinuities
Optional supplementary testing: magnetic particle inspection, radiographic testing, or leak testing
Recommended for PED Category III and IV pressure equipment, safety-critical systems, and high-integrity applications
Provides traceable test reports and certificates for regulatory compliance documentation

Manufacturing Process

The production of EN 10216-5 seamless coil tubes follows a rigorously controlled multi-stage manufacturing process to ensure dimensional accuracy, metallurgical integrity, and compliance with European pressure equipment standards:

Raw Material Selection & Inspection — Virgin stainless steel billets or slabs are sourced from certified mills and subjected to incoming quality control, including chemical composition analysis (spectrometry) and visual inspection to confirm conformity with the specified EN grade.
Hot Piercing & Forming — The steel billet is heated to forging temperature and pierced to produce a hollow tube blank. Continuous rolling mills are used to reduce the wall thickness and achieve the target outer diameter through controlled deformation.
Pilot Milling & Cold Drawing — A pilot is inserted or reduced at the tube bore to ensure internal dimensional accuracy. The tube then undergoes cold drawing through precision dies to achieve the exact OD and wall thickness tolerances specified by EN 10216-5.
Coiling & Straightening — The finished tube is wound into coils of the specified length and diameter. Precision coiling equipment ensures uniform winding tension and minimal mechanical damage to the tube surface.
Heat Treatment (Annealing) — Tubes are annealed in a controlled atmosphere furnace at temperatures between 1050°C and 1150°C, followed by controlled cooling. This process relieves residual stresses, restores full austenitic microstructure, and ensures optimal mechanical properties and corrosion resistance.
Pickling & Passivation — The annealed tubes undergo chemical pickling (typically using a mix of nitric and hydrofluoric acids) to remove scale and oxide films, followed by passivation to restore the protective chromium oxide layer on the surface.
Hydrostatic Testing — Every coil is subjected to a 100% hydrostatic pressure test at 1.5× the maximum allowable working pressure. Each tube segment is held under pressure for a specified dwell time to verify pressure integrity and detect any leakage or wall defects.
Non-Destructive Testing (TC2 Only) — For TC2 classification, the entire coil length undergoes automated eddy current or ultrasonic inspection. Any detected anomalies are marked, documented, and evaluated per the acceptance criteria defined in EN 10216-5.
Final Inspection & Certification — Completed coils are inspected for dimensional compliance, surface quality, and marking. Each coil receives a Mill Test Certificate (MTC) / EN 10204 3.1 Certificate documenting chemical composition, mechanical properties, hydrostatic test results, and NDT findings (where applicable).
Packaging & Dispatch — Coils are protected with moisture-resistant wrapping, secured on steel pallets or wooden crates, and marked with identification labels including grade, dimensions, standard, heat number, and PED conformity information.

Applications

The EN 10216-5 Seamless Stainless Steel Coil Tube is designed for a broad spectrum of pressure-critical applications across multiple industries:

Pressure Vessels & Boilers — Construction of heat exchangers, reactors, condensers, and storage vessels in chemical, petrochemical, and pharmaceutical processing plants operating under PED jurisdiction.
Process Piping Systems — Instrumentation piping, impulse lines, and transfer lines in refineries, power generation facilities, and manufacturing plants requiring corrosion-resistant, leak-free connections.
Automotive & Aerospace — Fuel lines, brake lines, hydraulic circuits, and air conditioning tubing in automotive, commercial vehicle, and aerospace manufacturing where weight, durability, and reliability are critical.
Food & Beverage Industry — CIP (Clean-in-Place) compatible tubing for milk processing, brewing, beverage dispensing, and food-grade fluid transfer systems requiring hygienic, non-reactive materials.
Medical & Pharmaceutical — Sterilizable tubing for medical gas delivery, pharmaceutical manufacturing lines, and laboratory equipment where biocompatibility and corrosion resistance are essential.
Energy & Power Generation — Condenser tubes, steam lines, and auxiliary piping in nuclear, fossil fuel, and renewable energy power plants operating at elevated temperatures and pressures.
Oil & Gas — Downhole tubing, wellhead instrumentation lines, and offshore platform piping systems exposed to corrosive hydrocarbon environments and high-pressure conditions.
Marine & Offshore — Ballast water system tubing, fire suppression lines, and auxiliary piping on ships, subsea installations, and offshore platforms requiring resistance to seawater corrosion.

Quality Certifications & Compliance

Wenzhou Jixing Metal Materials Co., Ltd maintains a comprehensive quality management system to ensure every EN 10216-5 coil tube product meets or exceeds European regulatory and industry standards:

EN 10216-5 Compliance — Full technical delivery conditions for seamless stainless steel pressure tubes as specified by the European Committee for Standardization (CEN).
EN 10204 3.1 Test Certificate — Each shipment is accompanied by a manufacturer's test certificate confirming chemical composition, mechanical properties, hydrostatic test results, and dimensional compliance.
PED 2014/68/EU Conformity — Products are manufactured and documented to support CE marking and conformity assessment under the EU Pressure Equipment Directive for Categories I through IV.
ISO 9001:2015 — Quality Management System certification ensuring consistent product quality and process control throughout the manufacturing chain.
ISO 3834 / EN 1090 — Welding quality standards compliance for downstream fabrication and assembly operations.
Material Traceability — Full heat-to-heat traceability from raw steel mill through to final coil dispatch, with documented chemical analysis and mechanical test records.
NDT Accreditation — TC2 non-destructive testing performed by qualified personnel in accordance with EN ISO 9712 standards.

Unique Selling Points

Full PED-Ready Documentation: Every coil tube ships with complete EN 10204 3.1 test certificates and PED conformity documentation, eliminating the need for additional testing or certification by the end user or pressure equipment manufacturer.

Dual Test Category Flexibility: Customers can select TC1 or TC2 classification at the