We introduce to you the detail:
1. Attention problem of seamless steel pipe cutting treatment
After straightening the seamless steel pipe, an initial inspection of soot blowing is required to determine the length of the cut head and tail. The purpose of the seamless steel pipe cutting is to remove the ends with cracks, knots, scars, tears and uneven wall thickness to obtain the required fixed-length seamless steel pipe.In addition, remove defects that are difficult to repair after inspection, such as inward folds, internal scarring, uneven wall thickness,etc.Generally, the former is cut off on the operation line, while the latter is cut off offline.
2. Control of heat preservation time of seamless steel tube during heat treatment
The heat preservation time during heat treatment of seamless steel pipe should ensure that the steel pipe in the furnace can be completely burned out to make its temperature uniform and complete the transformation of its proper structure, so as to obtain uniform structure and performance.Increasing the heating temperature can appropriately shorten the holding time.When performing low temperature annealing (including softening,stress relief and recrystallize annealing).The closer the annealing temperature is to the lower critical point A1, the faster the recovery of the seamless steel pipe and the more complete the role of eliminating work hardening,Therefore, the holding time can also be shortened appropriately.