Quality control of seamless steel pipes

Quality control of seamless steel pipes

The significance of quality control of seamless pipes

As an important steel product, seamless pipes are widely used in industrial production and civil fields. However, if the quality control is not strict during the manufacturing process of seamless pipes, the following problems may occur:

1. Safety risks: 

Unqualified quality of seamless pipes may lead to accident risks during production and use, causing personal and property losses. 

2. Economic losses:

Unqualified quality of seamless pipes may affect the service life and performance of seamless pipes, resulting in economic losses. Therefore, it is very important to implement quality control of seamless pipes. 

Quality control requirements of seamless pipes

1.Material control: 

The quality of seamless pipes must first be controlled from the raw materials, and high-quality steel billets must be selected to ensure that the surface is free of defects, bubbles, and cracks. At the same time, it is necessary to ensure that the chemical composition and mechanical properties of the raw materials meet the standard requirements. Such as high-purity steel to ensure the material performance and stability of seamless pipes.

2.Production process control:

In the manufacturing process of seamless pipes, various parameters must be controlled, such as pipe making temperature, heater temperature, pipe billet size, etc., to ensure that the diameter and thickness accuracy of seamless pipes meet the requirements, while reducing the number and degree of defects.

3. Non-destructive testing: 

The inspection of seamless pipes is an important means to ensure the quality of seamless pipes. During the manufacturing process, various non-destructive tests, such as ultrasonic testing, magnetic particle testing, etc., must be carried out to check the quality of seamless pipes and eliminate defects.

4. Mechanical property testing:

 The mechanical property testing of seamless pipes is also an important link to ensure the quality of seamless pipes. The tensile strength, yield strength, elastic modulus, etc. of seamless pipes can be tested by tensile testing machines and other equipment to ensure the performance of seamless pipes.

5. Surface treatment: 

The surface treatment of seamless pipes also has a certain impact on their quality. The surface roughness, cracks, folds and other defects, scale removal, pickling treatment and other processes are crucial to ensure the quality of seamless pipes. Visual inspection or special testing instruments can be used for inspection.

6. Size: 

The finished steel pipes are inspected to ensure that their diameter and wall thickness meet the standard requirements. Special measuring instruments can be used for measurement, such as micrometers, wall thickness gauges, etc.

7.Production process: 

Strictly control each process in the production process to ensure that the quality of each process is stable and reliable. Especially during the piercing and rolling process, the temperature and pressure must be strictly controlled to avoid cracks and deformation.

8. Metallographic structure:

The metallographic structure of the finished steel pipe is tested to ensure that its metallographic structure meets the standard requirements. Generally, a microscope is used to observe the metallographic structure to check whether there are microscopic defects.