Reasons for cracking of Q345B seamless steel pipe

1. Raw materials
Some Q345B seamless steel pipe factories will choose round steel produced by small steel factories for processing in order to save costs, but the Q345B steel produced by these small steel factories will contain many impurities, bubbles and other problems. There will be interlayers, pores, etc. inside, and after post-processing, cracking problems will occur.

2. Heat treatment temperature control
Some manufacturers do not have rich production experience, and it is impossible to guarantee whether the heat treatment of Q345B seamless steel pipe is up to standard when the heating temperature and duration are judged solely by the experience of workshop workers. However, heat treatment will change the mechanical properties of Q345B seamless steel pipes, and general manufacturers do not have testing equipment to judge whether Q345B seamless steel pipes have reached the performance indicators required by customers.

3. Straightening
In the process of straightening, excessive straightening force will also cause internal damage and cracks in the Q345B seamless steel pipe. In the later stage, it will be packaged and shipped without flaw detection, which is also the reason for the cracking of the Q345B seamless steel pipe in the later stage.

4. Pulling
If the amount of deformation in drawing is too large, cracks will also be formed, which will cause cracks in the Q345B seamless steel pipe during post-processing.

The above four points are the main factors causing the cracking of Q345B seamless steel pipes. BBN has many years of professional experience in manufacturing seamless steel pipes. Welcome new and old customers to come to our factory for negotiation!