1. What is the difference between 10# and 20# carbon steel seamless pipes in terms of performance?
Answer: Both are low carbon steels. 20# has higher carbon content than 10#, so its tensile strength and yield strength are slightly higher than 10#, but the plasticity is slightly lower. 10# is more suitable for occasions requiring high plasticity, and 20# is more suitable for occasions requiring slightly higher strength.
2. Why is 16Mn carbon steel seamless pipe more widely used than 45#?
Answer: 16Mn has better comprehensive performance: it has higher strength than ordinary carbon steel (10#, 20#) and better weldability and toughness than 45#. It can meet the requirements of most medium and high pressure and load-bearing occasions, so it is more widely used.
3. What is the minimum bending radius of carbon steel seamless pipe?
Answer: It depends on the pipe diameter, wall thickness and material. For ordinary 20# seamless pipe, the minimum bending radius is generally 3-5 times the outer diameter; for thick-walled pipes or high-specification 45# pipes, the minimum bending radius needs to be increased to 5-8 times to avoid pipe cracking.
4. Can carbon steel seamless pipes be used for transporting corrosive media?
Answer: Generally not recommended. Carbon steel has poor corrosion resistance and is easy to corrode when in contact with corrosive media (such as acid, alkali, salt water). If it is necessary to use it, anti-corrosion treatment (such as lining plastic, anti-corrosion coating) must be carried out on the inner wall.
5. What is the difference between seamless pipe and ERW welded pipe of 16Mn material?
Answer: 16Mn seamless pipe has no welding seam, high pressure resistance and good fatigue performance, suitable for high-pressure and high-temperature occasions; 16Mn ERW welded pipe has a welding seam, lower cost, but lower pressure-bearing capacity than seamless pipe, suitable for low and medium pressure occasions.
