Manufacturing method and manufacturing equipment for online hot rolling and rolling forming of seamless special pipes

Abstract

The invention relates to a manufacturing method and manufacturing equipment for online hot rolling and rolling forming of seamless special pipes. The preparation method for the seamless special pipes is simple, easy to implement, low in needed drawing force, energy saving and cost reducing, environmental pollution is reduced, the steel pipes cannot be damaged, and the produced steel pipes can reach the standards on appearance, overall dimensions and comprehensive mechanical performance indexes. The appearance, the overall dimensions and the comprehensive mechanical performance indexes are specifically reflected in that defects of drags, scratches and the like in the appearance are avoided; the overall dimensions, straightness, flatness, R angle and the like meet standard requirements; mechanical performance, impact property, the metallographic structure and the like meet standard requirements. Meanwhile, in the equipment, a forming mill is improved, a quick cooling device and a quick steel feeding device are added, and the production requirement for online hot rolling and rolling forming of the seamless special pipes can be met.

Description

technical field [0001] The invention relates to a method for preparing hot-rolled and rolled-on-line seamless special-shaped pipes and special-purpose manufacturing equipment, which uses the residual temperature of hot-rolled steel pipes to form on-line, and belongs to the technical field of metal products. Background technique [0002] In recent years, although the steel market as a whole is not optimistic, the demand for seamless steel pipes is still strong, and the development momentum is strong. In particular, seamless special-shaped steel pipes are more and more favored by customers. Because compared with the circular seamless steel pipe, the special-shaped seamless steel pipe has the following advantages: when the cross-sectional area is the same, the section moment of inertia of the special-shaped pipe is larger than that of the round pipe; The tube has greater bending stiffness; the special-shaped tube has better assembly, and the welding joint is reliable; the speci...

AI Technical Summary

Problems solved by technology

[0003] At present, most seamless special-shaped steel pipes are processed by cold drawing process, but the cold drawing process is relatively complicated, requiring processes such as head making, annealing, pickling, cold drawing, straightening, etc., and cold drawing is sliding friction, the required drawing The force is large, and it is easy to strain the inner and outer surfaces of the steel pipe. At the same time, the cold drawing manufacturing method not only has high energy consumption, but also has a low metal yield, and pickling and phosphating will also cause environmental pollution.

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