320 / 240 Grit ASTM A269 TP304L Stainless Steel Bright Annealed Tube For

Product Specification

320 / 240 Grit ASTM A269 TP304L Stainless Steel Bright Annealed Tube For Sanitary Application

ASTM A269 TP304L Bright Annealed Tube refers to a stainless steel seamless/welded tubular product made from low-carbon austenitic stainless steel 304L grade, manufactured and tested in accordance with the ASTM A269/A269M standard specification. The "Bright Annealed" surface signifies that the tube has undergone a final heat treatment in a controlled atmosphere furnace (typically containing hydrogen, nitrogen, or argon), which prevents oxidation and scaling, resulting in a clean, smooth, and aesthetically pleasing bright surface finish. YUHONG GROUP has manufactured ASTM A269 stainless steel tubes mainly from 6mm to 152.4mm diameter. The regular length is 6 meter or we can cut into fixed length according to the client’s request. We can provide different surfaces, including bright annealed, annealed and pickled, mechanical polished and electrochemical polished.

Chemical Composition of SS304L:

Mechanical Properties of SS304L:

Different Surface Finishes:

• Bright Annealed (BA): The tube is heat-treated in a controlled atmosphere furnace. This prevents oxidation, eliminating the need for pickling. The result is a smooth, shiny, and oxide-free surface. It is the preferred finish for high-purity systems, instrumentation, and aesthetic applications.
• Annealed and Pickled (AP): The tube is heat-treated in a standard air furnace, which forms a dark oxide scale. This scale is then removed by pickling in an acid bath (usually a mixture of nitric and hydrofluoric acids). The resulting surface is a dull, matte gray finish.
• Polished: Starting from an annealed and pickled or bright annealed base, the tube is mechanically polished to achieve a specific surface roughness, such as 240 Grit, 320 Grit, 400 Grit, 600 Grit, etc..

Key Advantages and Features:

• Excellent Corrosion Resistance: The chromium content provides good resistance to oxidation and a wide range of corrosive media. The low carbon content provides superior resistance to intergranular corrosion after welding.
• Superior Weldability
• Outstanding Surface Finish: The bright annealed finish provides a smooth, non-porous surface that is easy to clean, resists bacterial adhesion.
• High Strength and Ductility: Excellent mechanical properties allow for use in a wide range of pressures and temperatures, while remaining formable for bending and flaring.
• Good Formability and Toughness

Different Applications:

• Instrumentation and Controls: Used for impulse lines, sensing lines, and connecting instruments in chemical plants, refineries, and power generation where leak-tightness and corrosion resistance are critical.
• Pharmaceutical and Biotechnology: For high-purity process lines, clean steam, and water-for-injection systems where the smooth, non-reactive bright annealed surface prevents contamination.
• Food and Beverage Industry: For processing and transporting dairy products, beer, soft drinks, and other edibles, where hygiene and ease of cleaning (CIP/SIP) are paramount.
• Semiconductor and Electronics: For handling ultra-high-purity gases and chemicals. The bright annealed finish minimizes particle entrapment and outgassing.
• Hydraulic and Pneumatic Systems: For cylinders and control lines requiring a smooth internal surface for efficient seal operation.
• Cryogenic Applications: Due to its excellent toughness at very low temperatures, it is used in handling liquid nitrogen, oxygen, and natural gas.