Development of Technology of PQF Process for Rolling Heavy-wall,Extra-short Tube

The problems staying with the PQF process in case of rolling the heavy-wall，extra-short tube are solved by means of optimizing the process itself.Described as the focus is the key element restraining the production，i.e.，optimally matching the retained mandrel speed with the extractor rolling speed.A measure as taken is to increase the retained rack return time delay via the electric control system so as to ensure consistent torque of the extractor during the rolling process，which is in line with automatic operation of the entire rolling area.The actual site operation result shows that the steel tube geometric dimension accuracies are up to applicable specification，and the metal yield is also up to the designed target of the mill line.