The seamless steel pipes we use every day need to be done-some cutting treatment and heat treatment. What are the reasons for seamless steel tubes
to be treated?
Seamless steel pipe cutting treatment: After straightening the seamless steel pipe, the first inspection of soot blowing is performed to determine the length of the cutting head and tail. The purpose of seamless steel pipe cutting is to remove the ends with cracks, knots, scars, tears and uneven wall thickness to obtain the required fixed-size seamless steel pipe. In addition, the defects that are unqualified and difficult to salvage after removal are inspected. Such as inward folding, internal scarring, severe uneven wall thickness, etc. Generally, the former is cut on the work line, while the latter is cut off-line.
Control of heat preservation time during heat treatment of seamless steel pipe: The heat preservation time of heat treatment of seamless steel pipe should ensure that the steel pipe in the furnace can be completely burned through, make its temperature uniform, and complete the due structural transformation to obtain uniform structure and performance. -Generally increasing the heating temperature can shorten the holding time appropriately. When performing low temperature annealing (including softening, stress relief and recrystallization annealing), the closer the annealing temperature is to the lower critical point A1, the faster the recovery of the seamless steel pipe, the more complete the elimination of work hardening, so the holding time can also be appropriate shorten.