Cold Drawn TP304 Stainless Steel Seamless Pipe Bright Annealing SS Pipe Precison Pipes

Products Specification

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SS 304 Bright Annealed Pipe and Tube Equivalent Grades

Stainless Steel 304 BA Pipes and Tubes Chemical Composition

Introduction of BA Stainless Steel Tube

BA Stainless Steel Tube, known for its excellent surface finish, cleanliness, and high dimensional accuracy, is essential for industries requiring ultra-clean, high-purity conditions. These include sectors like biopharmaceuticals, semiconductors, liquid crystal displays (LCD), solar photovoltaic systems, and other high-tech fields. BA tubing undergoes a vacuum or controlled atmosphere heat treatment, producing a bright, reflective surface without oxidation, making it ideal for applications that require purity and corrosion resistance.

Materials and Standards of BA Stainless Steel Tube

Manufacturers typically use 304 and 316L stainless steels to produce BA stainless steel tubes, ensuring excellent corrosion resistance, strength, and versatility. These tubes adhere to various international standards, such as:

• ASTM A249, ASTM A269, ASTM A270, 3A, and BPE standards for the US.
• JIS G3447 and G3459 for Japan.

Manufacturing Process of BA Stainless Steel Tube

BA Stainless Steel Tube is primarily cold-rolled, offering high dimensional precision (up to 0.2%) and superior surface quality (Ra < 0.45 µm). Unlike polished tubes, the inner surface of BA tubing retains its smoothness, thanks to the advanced annealing process. Raw materials must comply with ASTM A269; in some cases, double-melted steel is employed for enhanced purity.

Characteristics of BA Stainless Steel Tube

BA Stainless Steel Tube is highly prized for its exceptional dimensional accuracy, smooth surface, and cleanliness. Moreover, their inner surface is softer than polished alternatives, making them ideal for ultra-clean applications. Additionally, the process ensures high precision, with dimensional accuracy reaching up to ±0.05 mm and surface roughness (Ra) approaching 0.4 µm.

Heat Treatment (Bright Annealing)

The heat treatment process, or bright annealing, occurs in a reducing atmosphere, where oxygen is minimized to prevent oxidation. This controlled environment maintains the tube’s smooth, reflective surface and optimizes its mechanical properties. As a result, the tubes are free of scale and, therefore, do not require further pickling or passivation.

Cleaning and Inspection of BA Stainless Steel Tube

Before leaving the production facility, BA tubes undergo an extensive cleaning process. Ultrasonic cleaning with degreasing agents like SC2286 removes oils and contaminants, ensuring ultra-clean surfaces are suitable for high-purity environments. Inspections involve methods like eddy current testing and hydraulic pressure tests to guarantee the absence of defects.

Finishing and Packaging of BA Stainless Steel Tube

After production, BA stainless steel tubes are straightened, cut to precise lengths, and polished to remove minor imperfections. Packaging typically includes several protective layers, such as PE bags, end caps, and anti-static materials, ensuring the tubes remain contamination-free during transport and storage.

Applications of BA Stainless Steel Tube

BA stainless steel tubes find extensive use in industries requiring ultra-high purity gas or fluid transport. Specific industries and applications include:

• Biopharmaceuticals
• Semiconductors
• Clean rooms and laboratories
• LCD and solar photovoltaic manufacturing
• High-purity gas systems
• WFI (Water for Injection) systems
• Compressed air and ultra-pure chemical systems

Additional Surface Treatments

Electropolished (EP) Tubing

Electropolished (EP) tubing is an extension of BA stainless steel tubing, where the internal surface undergoes an additional step of electrochemical polishing. This process further enhances smoothness and reduces the risk of contamination. EP tubing is the preferred choice for ultra-high purity applications, such as those in the semiconductor and pharmaceutical sectors.

Critical properties of EP tubes include:

• Diameter tolerance: ±0.02 mm (0.1%)
• Length tolerance: ±0.05 mm
• Straightness: ≤0.1 mm/m
• Surface roughness: Ra ≤ 0.15 µm
• Concentricity tolerance: ±0.01 mm

AP Tubing (Annealed and Pickled)

AP Tubing undergoes a less complex finishing process, including annealing, pickling, and passivation. This treatment removes surface oxides and enhances the tube’s mechanical properties for general applications.

MP Tubing (Mechanical Polish)

We mechanically polish stainless steel tubing to enhance internal and external surface finishes. While MP tubing does not achieve the smoothness of EP tubing, it remains suitable for less demanding clean applications requiring high surface quality but not ultra-high purity.

Key Properties

Corrosion Resistance

BA stainless steel tubes, particularly those made from 304 and 316L stainless steel, offer excellent corrosion resistance in most environments. The bright annealing process eliminates the need for pickling and passivation, further enhancing the material’s corrosion resistance by removing impurities and oxide layers.

Physical and Thermal Properties

Stainless steel BA tubes have impressive mechanical strength and moderate flexibility, making them ideal for bending and forming applications. Their thermal expansion coefficient and thermal conductivity are consistent with standard austenitic stainless steels, ensuring reliability in both high—and low-temperature environments.

Chemical Composition

• 304 Stainless Steel: 18-20% chromium, 8-10.5% nickel, with small amounts of carbon and manganese.
• 316L Stainless Steel: 16-18% chromium, 10-14% nickel, and 2-3% molybdenum for enhanced corrosion resistance.

Mechanical Properties

Stainless steel BA tubes exhibit high tensile strength and excellent elongation properties, allowing them to withstand high pressures and mechanical stresses daily in applications like gas lines and cleanroom systems.

Forming and Welding

Forming

Stainless steel BA tubes are relatively easy to form thanks to their high flexibility and controlled surface finish. They are suitable for bending, flaring, and other fabrication processes used in pipefitting and assembly.

Welding

Welding stainless steel BA tubes requires precision to avoid contamination and maintain surface integrity. TIG welding (Tungsten Inert Gas) is the preferred method, as it minimizes the introduction of impurities. After welding, proper passivation or electropolishing may be necessary to restore corrosion resistance and smoothness.

Corrosion of Welds

To maintain the tube’s overall corrosion resistance in critical applications, you must thoroughly clean and electropolish the welds. Welds can be vulnerable to corrosion, especially if the surface finish isn’t properly restored.

Descaling, Pickling, and Cleaning

Due to the bright annealing process, descaling and pickling processes are typically unnecessary in applications requiring stainless steel BA tubes. To ensure cleanliness, the appropriate chemical solutions clean tubes exposed to potential contaminants during fabrication, followed by rinsing with high-purity water.

Surface Finish Options

BA (Bright Anneal)

The standard finish for high-purity applications offers a smooth, reflective surface.

EP (Electropolished)

The manufacturing process achieves a superior internal surface finish, which is ideal for ultra-high purity systems where minimizing contamination is critical.

AP (Annealed and Pickled)

The bright annealing process is followed by chemical pickling to remove oxides, creating a bare finish.

MP (Mechanical Polish)

Mechanical polishing creates a polished surface, making it suitable for applications requiring cleanliness but not necessarily ultra-high purity levels.

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