What is the thick-walled Seamless Steel pipes?
Thick-walled seamless steel pipe refers to a steel pipe whose outer diameter to wall thickness ratio is less than 20. Common products include ASTM A106 seamless steel pipe, ASTM A53, etc.
It is mainly used as petroleum geological drilling pipes, petrochemical cracking pipes, boiler pipes, bearing pipes and high-precision structural pipes for automobiles, tractors, aviation, etc.
What are the characteristics of thick-walled seamless steel pipes?
Thick-walled SMLS steel pipe is a kind of seamless steel pipe with larger wall thickness. No welding process is used in its manufacturing process, so it has the following characteristics.
1. High strength: Since seamless pipes have no welds, they are stronger and can withstand greater pressure and heavy loads.
2. Corrosion resistance: Made of high-quality alloy materials, it has corrosion resistance and can be used for a long time in harsh environments.
3. Good dimensional stability: The inner and outer diameters of seamless pipes have high precision, ensuring the dimensional stability and accuracy of the pipes.
Advantages: It has the characteristics of high strength, corrosion resistance, dimensional stability, etc., and is suitable for use in high pressure, high temperature and harsh environments.
Disadvantages: Compared with welded pipes, thick-walled seamless pipes are more expensive and require more resources in the production process.
How should we identify the quality of thick-walled seamless steel pipes?
1. High-quality thick-walled seamless steel pipes with uniform composition.
2. However, due to the poor material, the end face of the cutting head is uneven and has no metallic luster.
3. Inferior thick-walled seamless pipes have no metallic luster and are light red or similar to pig iron. There are two reasons for the production of steel billets. One is that the rolling temperature of inferior materials is not standardized. The second is to visually measure the steel temperature.
When rolled according to the specified austenite area, the performance of thick-walled seamless steel pipes will naturally not meet the standards.
4. The material of fake and inferior thick-walled seamless steel pipes has many impurities, the steel density is low, and the dimensions are seriously out of tolerance. In the absence of vernier calipers, they can be weighed and inspected.
5. The cross-section of inferior thick-walled seamless pipes is oval because the manufacturer reduces the number of the first two passes of the finished roll in order to save material.
6. The surface of inferior thick-walled seamless pipes is prone to scars.
①Inferior thick-walled seamless steel pipes have uneven materials and many impurities.
② The guide equipment of counterfeit and shoddy material manufacturers is simple and easy to stick to steel. These impurities can easily leave scars after biting the roller.
7. The surface of inferior materials is prone to cracks because the blank is made of adobe. There are many pores on the adobe. The adobe will crack due to thermal stress during the cooling process, and cracks will occur after rolling.
