What should be paid attention to after the seamless steel tube is cut? What should be paid attention to during the heat treatment? The following seamless steel tube manufacturers will introduce you in detail:
1. Attention to cutting of seamless steel tube
After the seamless steel pipe is straightened, the initial inspection of soot blowing is performed to determine the length of the cut head and tail. The purpose of seamless steel tube cutting is to remove the ends with cracks, knots, scars, tears and uneven wall thickness to obtain the required fixed-size seamless steel tube. In addition, the defects that are unqualified and difficult to salvage after inspection are removed, as shown in the figure. Breaks, internal scarring, severe uneven wall thickness, etc. Generally the former is cut off on the working line, while the latter is cut off-line.
2. Control of heat preservation time during seamless steel tube heat treatment
The heat preservation time of the seamless steel tube during heat treatment should ensure that the steel pipe in the furnace can be completely burned through, make its temperature uniform, and complete the due structural transformation, so as 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 and the more complete the effect of eliminating work hardening, so the holding time can also be appropriately shortened.
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