Surface treatment of precision seamless pipes

Surface treatment of precision seamless pipes

1.Grinding treatment

The annular indentation has caused a certain degree of damage to the surface of the precision tube. Grinding can be used to remove the damaged part of the surface and restore the original surface finish. Grinding can be done using a grinder or electric grinding head, but it should be noted that the grinding strength and speed should be moderate to avoid secondary damage to the precision tube.

2. Polishing treatment

For precision tube that require high surface finish, grinding may not be able to meet the requirements. In this case, polishing methods can be used to deal with annular indentations. Polishing can be achieved by mechanical or chemical methods. The specific operation methods are as follows:

(1) Mechanical polishing: Use a polishing machine and grinding cloth for polishing to ensure the cleanliness of the polishing head and grinding cloth to avoid contaminating the surface of the precision steel pipe;

(2) Chemical polishing: Choosing the appropriate polishing fluid and processing time can achieve better polishing effects.

3. Filling processing

For deeper annular indentations, or areas that cannot be completely repaired by grinding and polishing, a filling method may be considered. The filling method can fill the annular indentation with filler, and then grind and polish it to restore the surface of the precision steel pipe to its original appearance.

4.Heat treatment

When the annular indentation is severe and has affected the actual use effect of precision steel pipes, heat treatment methods can be considered. Heat treatment can cause certain plastic deformation of precision tube through heating and cooling, thereby eliminating annular indentations. However, it should be noted that the heat treatment temperature and time must be controlled very precisely to avoid further damage to the precision tube.

Degreasing and degreasing methods for precision steel pipes

1. Principle of steel pipe degreasing

Impurities such as fat and oil on the surface of steel pipes will affect the adhesion and corrosion resistance of the coating, so they need to be removed through degreasing. The principle of steel pipe degreasing is to use chemicals such as solvents or alkaline electrolytes to react with fatty acids under certain conditions to decompose the fatty acids into water-soluble soap and other substances, thereby removing impurities such as fat and oil on the surface.

2. Steel pipe degreasing method

(1) Chemical degreasing method: Use chemical agents such as organic solvents or alkaline electrolytes for degreasing treatment. This method has the advantages of good degreasing effect and fast speed, but has the disadvantages of polluting the environment and consuming a lot of energy.

(2) Mechanical degreasing method: Use mechanical mechanics principles such as friction and pressure to perform degreasing treatment. This method has the advantages of simple operation, no pollution, and low cost, but it cannot completely remove surface impurities, and the degreasing effect is not as good as the chemical degreasing method.

(3) Thermal degreasing method: heat the steel pipe to a certain temperature and use thermal energy to remove surface oil and other impurities. This method will not cause environmental pollution, but it is only suitable for low-temperature adsorption and desorption of grease, and its performance is poor.

3. Precautions

(1) Before degreasing, the surface should be cleaned to remove shallow stains to ensure the degreasing effect.

(2) Select appropriate chemicals and process conditions for degreasing treatment to avoid affecting the surface and mechanical properties of the steel pipe.

(3) The degreasing process will produce some harmful gases and wastewater, which need to be treated and discharged to avoid environmental pollution.

In short, steel pipe degreasing is a key process to remove oil stains and other impurities on the surface of steel pipes, and plays an important role in ensuring the quality and service life of steel pipe coatings.

Passivation treatment of precision seamless tubes

1.Overview

Passivation refers to forming a lighter-colored oxide layer on the metal surface, making the metal surface smoother and weakening the ability to rust and corrode, thereby improving the corrosion resistance, durability, decoration and lubricity of the metal. Seamless  pipe passivation treatment is to perform chemical reaction treatment on the surface of seamless steel pipe to prevent it from being oxidized and corroded, and improve its service life and application effect.

2. Process

(1) Pretreatment: Clean the surface of the steel pipe to remove oil and impurities to ensure the purity of the surface during reaction.

(2) Pickling: Put the seamless steel pipe into an acidic solution to react to form an oxide layer on its surface.

(3) Cleaning: Wash away the remaining pickling liquid and impurities with water to ensure the surface is clean.

(4) Passivation: Put the steel pipe into the passivation solution to react, so that an oxide layer with a thickness of about 1 micron is formed on the surface of the steel pipe to enhance its corrosion resistance and durability.

(5) Cleaning: Wash the passivation solution with water to ensure that there are no residual passivation solutions and impurities on the surface of the steel pipe.

(6) Drying: Drain the moisture on the surface of the steel pipe.

3.Application

Seamless steel pipe passivation treatment has a wide range of applications, such as automobiles, ships, machinery, electronics, construction and other fields, and is used for surface anti-corrosion treatment of pipes, containers, components and other products. In the construction industry, passivation treatment of seamless steel pipes can improve the durability and strength of steel pipes and ensure the safety of buildings. In the manufacturing industry, passivation of seamless steel pipes can improve product quality and reduce production costs.

In short, the passivation treatment of seamless steel pipes can not only improve the corrosion resistance and durability of the metal, but also enhance its decorativeness and lubricity. It is widely used in various fields and provides strong support for the development of all walks of life.