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How To Choose Stainless Steel Pipes for Mechanical Equipment?

In the construction of mechanical equipment, the choice of stainless steel pipe is crucial. Here are some key points to help you choose the right stainless steel pipe.

How To Choose Stainless Steel Pipes for Mechanical Equipment? 1

1. Understand the material of stainless steel pipe

 • Common material types:

 304 stainless steel pipe: This is the most commonly used one. It contains 18% chromium and 8% nickel, has good corrosion resistance, and can remain stable in general environments and various chemical media. For example, in food processing equipment, 304 stainless steel pipe can resist the corrosion of salt and acidic substances in food.

 • 316 stainless steel pipe: In addition to chromium and nickel, it also contains molybdenum. The addition of molybdenum enhances its tolerance to strong corrosive media such as chlorides. So if the mechanical equipment is used at the seaside or often in contact with chlorine-containing chemical environments, 316 stainless steel pipe is a better choice.

 • Material verification method:

 • You can check the material certificate provided by the supplier, which will detail the material composition and other information of the stainless steel pipe. At the same time, you can also use some simple testing tools, such as stainless steel testing potions, to preliminarily determine whether the material meets the standards.

 2. Consider the dimensional accuracy of the pipe

How To Choose Stainless Steel Pipes for Mechanical Equipment? 2

• Outer diameter and inner diameter dimensions:

 • For some mechanical equipment that requires precise matching, such as hydraulic equipment, the outer diameter and inner diameter dimensional accuracy of stainless steel pipes are very high. Accurate dimensions can ensure the sealing of pipeline connections and prevent liquid leakage.

 • According to the design drawings of the equipment, choose stainless steel pipes with appropriate outer diameter and inner diameter dimensions, and pay attention to the tolerance range of the dimensions. Generally, high-quality stainless steel pipe manufacturers will strictly control the dimensional tolerance to meet the needs of different industrial applications.

 • Length specifications:

 • Stainless steel pipes are available in different lengths, and the most common is a 6-meter standard pipe. However, if the equipment has special requirements for the length of the pipe, such as the need to customize the length to reduce the number of connection points, then it is necessary to communicate with the supplier to see if the required length can be provided.

 3. Choice of pipe wall thickness

How To Choose Stainless Steel Pipes for Mechanical Equipment? 3

• Choose according to pressure requirements:

 • If the stainless steel pipe is used to transport high-pressure liquids or gases, such as in chemical high-pressure reaction equipment, a thicker pipe wall is required to withstand the pressure. Generally speaking, the thicker the pipe wall, the stronger its pressure resistance.

 • The appropriate wall thickness can be determined by calculating the pressure that the pipeline is subjected to under working conditions and combining it with the material strength of the stainless steel pipe.

 • Consider cost and weight factors:

 • Too thick a wall will increase the material cost and the overall weight of the equipment. On the premise of meeting the strength and safety requirements of the equipment, a reasonable selection of wall thickness can reduce costs and reduce the weight of the equipment. For example, in some movable mechanical equipment with strict weight restrictions, it is a better choice to choose a stainless steel pipe with a thinner wall while ensuring safety.

 4. Surface quality

How To Choose Stainless Steel Pipes for Mechanical Equipment? 4

 • Surface finish:

 • For some mechanical equipment with high appearance requirements, or for pipeline systems that need to reduce fluid resistance, stainless steel pipes with high surface finish need to be selected. Smooth surfaces can reduce the adhesion of impurities, and are also easy to clean in some food and drug production equipment.

 • The surface finish of stainless steel pipes can be preliminarily judged by observation and touch. The surface of high-quality stainless steel pipes should have no obvious scratches, pits and burrs.

 • Surface treatment methods:

 • Common surface treatment methods include polishing and pickling. Polishing can make the surface of stainless steel pipes as bright as a mirror, and pickling can remove the oxide scale and impurities on the surface. According to the specific purpose and appearance requirements of the equipment, choose a stainless steel pipe with a suitable surface treatment method.

 5. Processing performance

How To Choose Stainless Steel Pipes for Mechanical Equipment? 5

• Bending performance:

 • If the stainless steel pipe needs to be bent during the manufacturing process of mechanical equipment, then choose a stainless steel pipe with good bending performance. Some stainless steel pipes with harder materials may crack when bent, affecting the quality of the pipeline.

 • You can understand its bending performance by checking the material manual of the stainless steel pipe or consulting the supplier, or you can verify it by conducting a small batch of trial bends.

 • Welding performance:

 • When assembling mechanical equipment, stainless steel pipes often need to be welded. Stainless steel pipes of different materials have different welding performance. For example, 304 stainless steel pipes are relatively easy to weld, and the welding quality can be guaranteed by selecting appropriate welding materials and processes. When selecting stainless steel pipes, consider whether their welding performance meets the welding process requirements of equipment manufacturing.

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