Rolling manufacturing method of special-shaped seamless steel pipe

Abstract

The present invention relates to a special-shaped seamless steel pipe rolling manufacturing method, which directly uses cold rolling to manufacture a special-shaped seamless steel pipe, and specifically comprises: raw material preparing, roller type straightening, flaw detection, cold rolling pretreatment, cold rolling, heat treatment, straightening, marking and warehousing, wherein hot rolling isfirstly performed to obtain a special-shaped seamless steel pipe billet material for cold rolling at a room temperature, and the special-shaped seamless steel pipe is manufactured by using cold rolling, wherein the process steps specifically comprise raw material preparing, heating, hot rolling, annealing, roller type straightening, flaw detection, cold rolling pretreatment, cold rolling, heat treatment, straightening, marking and warehousing. According to the present invention, with the special-shaped seamless steel pipe rolling manufacturing method, the manufacture of the special-shaped seamless steel pipe is not limited by the raw material; the hot rolling and the cold rolling are combined by using the rolling tool and the core rod die or the cold rolling is separately performed, suchthat the advantages of easy performing and high yield are provided; and the flexible combination installation can be performed according to the requirement, and the installation precision can be controlled.

Description

technical field [0001] The invention belongs to the technical field of manufacturing seamless steel pipe products, and in particular relates to a rolling manufacturing method of special-shaped seamless steel pipes. Background technique [0002] Special-shaped steel pipe is a general term for steel pipes with cross-sectional shapes other than round pipes. With the rapid development of various industries such as construction, manufacturing, aerospace, marine engineering, petrochemical, electric power, highways, high-speed railways, mining machinery, construction machinery, etc., special-shaped steel pipes are economical cross-section profiles that can meet different stress conditions. , attracting more and more attention. Special-shaped steel pipes can better adapt to the particularity of use conditions, save metal and improve labor productivity in parts manufacturing. Special-shaped steel pipes generally have a large moment of inertia and section modulus, and have a large r...

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Problems solved by technology

[0006] The above-mentioned patent also discloses a solution: the method of processing welded or seamless steel pipes into special-shaped steel pipes by using roller-type cold-bending to push and deform steel pipes. This patent also provides a large initial development investment. When the design is unreasonable, it is necessary to redesign the processing roll, which will cause waste of resources such as manpower and material resources, and increase the production cost.

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