No. 45 seamless tube can greatly save machining man-hours, improve material utilization, and help improve product quality at the same time. Compared with ordinary steel tubes, No. 45 seamless tubes have higher dimensional accuracy and better surface finish. Therefore, No. 45 seamless tube has been widely used.

Annealing method of No. 45 seamless tube:
Annealing of No. 45 seamless tube can keep the surface of the steel tube bright and dimensional accuracy, and realize the surface oxidation and non-decarburization cold-rolled strip annealing in a protective atmosphere. The protective atmosphere has a single inert gas argon or helium. The composition of these mixed gases can be adjusted to make the oxidation and reduction, decarburization and carburization speeds equal in the annealing process, so as to realize the non-oxidation and non-decarburization of the annealing.