1. What is a carbon steel seamless pipe?
Answer: A carbon steel seamless pipe is a pipe made of carbon steel, which is produced by piercing a solid steel billet into a hollow tube blank and then rolling it without any welding seams. It is widely used in various industrial fields due to its good pressure resistance and toughness.
2. What are the common materials of carbon steel seamless pipes?
Answer: Common materials mainly include general carbon steel, such as 10# carbon steel (low carbon steel) and 20# carbon steel (medium carbon steel). These materials have good plasticity, toughness and weldability, suitable for general pressure and temperature conditions.
3. What are the high-specification materials of carbon steel seamless pipes?
Answer: High-specification materials include high-quality carbon steel (e.g., 45#) and low-alloy carbon steel (e.g., 16Mn/Q345, 20MnG). These materials have higher strength, hardness and wear resistance than common materials, and are suitable for harsh working conditions such as high pressure, high temperature and heavy load.
4.What is the difference in carbon content between common and high-specification carbon steel seamless pipes?
Answer: Common carbon steel seamless pipes (10#, 20#) have a carbon content of 0.10%-0.23%, which belongs to low and medium carbon steel; high-specification materials such as 45# have a carbon content of 0.42%-0.50% (high carbon steel), and 16Mn/Q345 has a carbon content of 0.12%-0.20% but contains alloy elements such as manganese to improve strength.
5. What is the main production process of carbon steel seamless pipes?
Answer: The main production process includes: steel billet heating → piercing (to form a hollow tube blank) → hot rolling/cold rolling → heat treatment (annealing, normalizing, quenching and tempering) → straightening → inspection → packaging. High-specification pipes often require more precise heat treatment and surface processing.
