Seamless steel pipes are used in every corner of our lives. In addition to being widely used in natural gas extraction, oil extraction and transportation processes, seamless steel pipes are also widely used in people's daily lives, such as bicycle manufacturing processes and machinery manufacturing. Process transmission shafts, cable conveying pipes, pressure vessel auxiliary accessories and other applications.
One of the most common problems in the manufacturing process of seamless steel pipes is steel pipe cracking. The cracking of seamless steel pipes has a great impact. It not only causes the loss of raw materials used, but sometimes also causes casualties. How to control the cracking of seamless steel pipes? Due to the situation, many experts are looking for the best control method after many experiments. Seamless steel pipe factories will produce cracked steel pipes when producing seamless steel pipes. Cracks are not terrible. We should investigate the causes and find solutions. This article will analyze and elaborate on some factors that may cause steel pipe cracking during the production process of seamless steel pipes.
Main factors affecting seamless steel pipe cracking
1. The influence of original material defects on the cracking of seamless steel pipes
In the actual production process, there are many factors that affect the production of tube blanks. The main factors are the production environment and production process of the tube blanks. There are also many defects caused by the tube blank production process, such as segregation, non-metallic inclusions, loose tube blanks, etc. , these defects also have a certain impact on steel pipe cracking to a certain extent.
2. Heating temperature factor
Seamless steel pipe, SSAW steel pipe, Casing and tubing all require cold rolling and hot rolling manufacturing processes.The first important process in the production of seamless steel pipes is hot rolling. Poor hot rolling (uneven, insufficient temperature, etc.) will cause internal warping, etc.
3. Influence of elemental composition of tube blank
Since all chemical elements in seamless steel pipes have their own unique properties, if segregation occurs during the production process of the steel pipe, the mechanical properties of the steel pipe will be biased and the chemical composition will be unevenly distributed, resulting in concentrated local stress on the steel pipe. Causes cracking during production.
4. Equipment debugging factors
From the moment it comes out of the furnace, every equipment component will affect the final quality of seamless steel pipes. For example, the scraping of equipment parts will cause outward warping and dents; failure to enter the punching machine will cause the head of the tube blank to be wetted and difficult to bite in, or the head will warp inside.
Preventive measures for cracking of seamless steel pipe
1. Strengthen material selection: Prioritize the selection of high-quality, compliant materials, and strictly control manufacturing parameters during the production process.
2. Standardize the manufacturing process: Strengthen equipment care and maintenance to ensure that various process parameters during the manufacturing process meet specification requirements.
3. Carefully design seamless steel pipes: During the design process, the use conditions and load conditions must be comprehensively considered, and more appropriate materials and wall thicknesses must be used.
4. Reasonable selection of welding materials and welding processes: In order to prevent cracking caused by welding, it is necessary to select welding materials that meet the regulations and ensure the rationality of the welding process parameters.
5. Conduct non-destructive testing of steel pipes: During the manufacturing and use of seamless steel pipes, non-destructive testing is used to check the quality and damage of the steel pipes, so that timely measures can be taken to prevent and repair cracks.
The cracking of seamless steel pipes has a great impact on the safety of equipment and buildings, so the prevention and control of seamless steel pipe cracking must be taken seriously. During the production and use process, it is necessary to strengthen material selection and production process control, adopt scientific design and manufacturing processes, select appropriate welding materials and welding processes, and conduct necessary non-destructive testing to ensure the quality of seamless steel pipes and prevent Cracking occurs.