Generally, when Q345 seamless steel pipe is used, there are certain requirements for temperature and other conditions. Only when the temperature and conditions are suitable, can the performance of Q345 seamless steel pipe be better developed.

The service temperature range of Q345B seamless steel pipe in GB / T 8163 is: - 20 ℃ ~ 425 ℃. GB / T 8163-2008 seamless steel pipe for fluid transportation: this standard specifies the ordering content, dimension, shape, weight, technical requirements, test method, inspection rules, packaging, mark and quality certificate of seamless steel pipe for fluid transportation. GBT8163 standard is applicable to general seamless steel pipe for fluid transportation. Q345 seamless steel pipe can be divided into Q345A, Q345B, Q345C, Q345D and Q345E. Their impact temperature is different. Q345A, no impact; Q345B, impact at 20 degrees temperature; Q345C, impact at 0 degrees; Q345D, impact at - 20 degrees; Q345E, impact at - 40 degrees.