Main characteristics and manufacturing process of large-diameter stainless steel pipes

 Large caliber stainless steel pipes usually refer to stainless steel pipes with an outer diameter of over 100 millimeters, and are usually made of high-quality stainless steel materials such as 304 and 316. Its main features include:

1. Corrosion resistance: Stainless steel pipes have excellent oxidation resistance and corrosion resistance, and can be used in various harsh environments without being easily corroded by chemicals.

2. High strength: Large diameter stainless steel pipes have a large wall thickness and strong load-bearing capacity, which can withstand high pressure and impact. They are commonly used in high-pressure and heavy-duty applications.

3. High temperature resistance: Excellent stainless steel materials can maintain stable physical properties under high temperature conditions, suitable for use in heat exchange equipment and petrochemical industries.

4. Superior processing performance: Large diameter stainless steel pipes can be customized into different shapes and specifications through welding, cutting, bending, and other processing methods to meet various engineering needs.

The manufacturing process of large-diameter stainless steel pipes is divided into several important steps, each of which is crucial and directly affects the quality and performance of the pipes.

1. Selection of raw materials: Excellent stainless steel raw materials must be selected, commonly including 304 and 316 stainless steel. 304 type is suitable for general environments, while 316 type is superior in corrosion resistance and suitable for seawater and high salt environments.

2. Heat treatment: During the manufacturing process, the pipe material needs to undergo heat treatment to eliminate internal stress and further improve its mechanical and corrosion resistance properties.

3. Forming: Large diameter stainless steel pipes are usually formed using hot rolling or cold drawing techniques. Hot rolled pipes are formed at high temperatures, with thick walls that are suitable for withstanding high-pressure environments; Cold drawn tubes are made through a stretching process at room temperature, which has good dimensional accuracy and surface smoothness.

4. Welding and Inspection: In the welding process of large-diameter stainless steel pipes, TIG welding or MIG welding is usually used to ensure the quality of the weld seam. After welding, the pipe material needs to be inspected multiple times, including non-destructive testing, pressure testing, etc., to ensure its reliability during use.

5. Surface treatment: In order to improve the anti-corrosion ability and aesthetics of stainless steel pipes, manufacturers often carry out surface treatments such as acid washing, passivation, and spraying.