1. Can carbon steel seamless pipes be used in boiler systems?
Answer: Yes. Common carbon steel pipes (20#) can be used in low-pressure boilers (pressure ≤2.5MPa, temperature ≤350℃); high-specification pipes such as 20MnG, 15CrMoG are used in high-pressure boilers (pressure >2.5MPa, temperature >350℃).
2. What is the difference in processing performance between common and high-specification carbon steel seamless pipes?
Answer: Common carbon steel pipes (10#, 20#) have good processing performance, easy to cut, bend, punch and other processing; high-specification pipes such as 45# have high hardness and poor processing performance, requiring higher processing speed and cutting tools, and may need annealing before processing.
3. What is the material grade of carbon steel seamless pipes corresponding to international standards?
Answer: 20# carbon steel corresponds to ASTM A106 Gr.B (American standard), EN 10210 S235JR (European standard); 16Mn/Q345 corresponds to ASTM A106 Gr.C, EN 10210 S355JR; 45# corresponds to ASTM A1084, EN 10210 C45.
4. Are carbon steel seamless pipes magnetic?
Answer: Yes. Both common and high-specification carbon steel seamless pipes are ferromagnetic materials, which can be attracted by magnets. This is a simple way to distinguish carbon steel pipes from stainless steel pipes (stainless steel pipes are generally non-magnetic or weakly magnetic).
5. What are the main factors affecting the performance of carbon steel seamless pipes?
Answer: The main factors include: 1. Chemical composition (carbon content, alloy elements content); 2. Heat treatment process (annealing, normalizing, quenching and tempering); 3. Production process (piercing, rolling precision); 4. Dimensional parameters (wall thickness, diameter); 5. Surface and internal quality (defects, inclusions).
