Stainless Steel Coil Tube

• ​Introduction

Stainless steel coil tube is a type of long, thin-walled tubular product made of stainless steel, characterized by its coiled shape for easy storage and transportation. It is widely used in industries such as chemical engineering, food processing, pharmaceuticals, and refrigeration due to its excellent corrosion resistance, high-temperature resistance, and good mechanical properties.

• ​Main Functions

Heat Transfer Medium: Facilitates heat exchange in refrigeration, air conditioning, and heat pump systems by carrying hot or cold fluids.

Fluid Conveyance: Transports corrosive, high-purity, or high-temperature fluids (such as chemicals, food-grade liquids, and steam) without contamination.

Reaction Vessel Accessory: Serves as a coil in reactors for uniform heating or cooling of reactants.

Mechanical Protection: Acts as a protective sleeve for cables or pipelines in harsh environments due to its durability.

• ​Tubing Standards

ASTM A269，ASTM A213，ASTM A249； EN 10216-5，EN 10217-7； GB/T 14976，GB/T 12771，GB/T 13296.

• ​Material & Performance

304/304L(1.4301/1.4307) is preferred for general environments; 316/316L(1.4401/1.4404) is preferred for chlorine-containing and highly corrosive environments; 321(1.4541) is the priority for high-temperature environments.

Corrosion resistance：Stainless steel materials form a dense oxide film on the surface, which can resist the corrosion of most acids, alkalis and other media. High temperature resistance：It can work stably in high temperature environments, and the specific temperature range depends on the material. Mechanical properties: Has high strength, toughness and ductility, and can withstand certain pressure and bending deformation. Surface finish：The inner and outer surfaces are smooth, which can reduce fluid resistance and avoid fluid pollution.

• ​Manufacturing Process

Raw Material Preparation  — Selected stainless steel billets (seamless) or strips (welded) undergo chemical and mechanical tests to meet standards like ASTM A269.

Tube Formation  — Seamless: Billets are hot-extruded into hollow shells, then cold-rolled/drawn for precision, with annealing to relieve stress. Welded: Strips are coiled into tubes, welded via TIG/laser, and heat-treated to prevent corrosion.

Heat Treatment  — Annealing (800–1100°C) improves ductility; solution annealing (1050–1150°C) enhances corrosion resistance for austenitic grades.

Coiling  — Straight tubes are coiled by CNC machines, with inert gas protection for thin-walled types to avoid oxidation.

Surface Treatment  — Pickling removes impurities; passivation forms a protective oxide layer. Polishing (optional) ensures low roughness for hygiene-critical uses.

Quality Testing  — Dimensional checks, pressure tests, and NDT (ultrasonic/eddy current) verify compliance with standards.

• Specifications