Seamless steel pipe cracks reasons:
First: the organization is non-uniform tube reasons. 16Mn previous steel grade Q345B already changed, and it does not matter, pay attention to choose to perform a standard tube, a certain scale manufacturers of bar line.
Second: finish annealing temperature is suitable. Perforation heating temperature of 1180 ~ 1230 ℃, low carbon steel which is a temperature taken 1230-1250, it is appropriate. 35min furnace or heating time is the time? Furnace time is generally more than 60min.
Third: the reason cracks, test proved that the tube (round) the reasons for the majority, the interior contains more cracks, inclusions, gas and other packages. Perforated temperature, process adjustments can not be ignored, if the temperature is low perforation, adjusted properly, can also cause tearing capillary internal organization.
