6 Steps of Mild Steel Pipe Pickling

Mild steel pipe is a seamless steel pipe made of carbon steel with a carbon content of less than 0.25%. It is also called soft steel because of its low strength, low hardness and softness. It is a kind of carbon steel pipe.

Basic principle of pickling process of mild steel pipe

Pickling of mild steel pipe is a chemical reaction. Its basic principle is to use acid solution to chemically corrode the steel pipe to remove the surface oxide scale and welding slag to achieve a clean and bright effect. The pickling process can improve the quality and finish of the steel pipe surface, and at the same time provide a good foundation for subsequent production, processing and surface treatment.

Pickling process of mild steel pipe

The process flow of pickling of mild steel pipe is mainly divided into pretreatment, cleaning, soaking, neutralization, water rinsing, post-treatment and other steps. The specific process is as follows:

1. Pretreatment

The surface of the steel pipe must be pretreated, including the process of degreasing and dust removal to ensure that there are no impurities and dirt on the surface of the steel pipe.

2. Cleaning

Put the mild steel pipe in the cleaning tank and use alkaline solution to clean it to remove burrs and other debris on the surface of the steel pipe.

3. Soaking

Put the steel pipe in the pickling tank for soaking. Add acidic solution to the pickling tank, and the iron oxide scale on the surface of the steel pipe will be corroded.

4. Neutralization

The acid needs to be neutralized during the pickling process. Use alkaline solution to neutralize the remaining acid to make it neutral.

5. Rinse with clean water

After pickling, rinse the steel pipe in a clean water tank to remove the acidic solution and neutralizer.

6. Post-treatment

After pickling, the surface of the steel pipe will become dry and dull, and post-treatment such as oiling, painting, electroplating and other surface treatments are required to achieve the required quality standards.

Precautions for pickling of mild steel pipes

1. The pickling process should be carried out in a well-ventilated environment to ensure the health and safety of the operators.

2. During the pickling process, the concentration and neutralization degree of the acid solution should be checked regularly to ensure the pickling effect and work safety.

3. The pickling tank should be cleaned and replaced regularly to avoid the influence of dirt and debris in the tank on the pickling effect.

4. After pickling, the surface of the steel pipe should be post-treated in time to avoid oxidation and corrosion on the surface of the steel pipe.

5. The waste liquid and waste gas generated during the pickling process should be treated in accordance with national environmental protection regulations to protect the environment and ecology.

Conclusion

This article introduces the basic principles, process flow and precautions of the pickling process of mild steel pipes in detail. I hope it can help engineers and technicians engaged in steel pipe production and research and development to learn and refer to ensure the safety of the pickling process and production quality.