Production process for extra-large aperture super wall thickness square steel pipe

Abstract

The invention relates to a production process for an extra-large aperture super wall thickness square steel pipe. A steel flat plate blank material with specified plate thickness and length and matched with the size of a final product is used, and bent through a bending machine, then the operation of rolling, closing, and overlap welding are performed on the blank materials, and the blank material is welded and reshaped through straightening, so that a final extra-large aperture super wall thickness square steel pipe is formed. The production process is not limited by parent metal, and production can be performed according to the requirements for sizes of different specifications of square steel pipes; Compared with other square steel pipe production process which needs hot working, the production process saves energy consumption, is simple, reduces procedures and improves production efficiency, so that the strength of the produced square steel pipe is improved to a great extent. The process technology fills a gap of the production of the domestic extra-large aperture super wall thickness square steel pipes, and has an important social significance.

Description

technical field [0001] The invention relates to a production process of a super-large-diameter super-thick square pipe, in particular to a single-seam straight seam submerged arc welded square steel pipe. Background technique [0002] As we all know, after nearly ten years of rapid development in my country's steel pipe industry, steel pipe production has accounted for more than 50% of the world's steel pipe production, of which seamless steel pipe production accounts for more than 60% of the world's total, and welded steel pipe production accounts for 45% of the world's total. Above, my country has become a veritable world steel pipe production power. It has reached the world advanced level in terms of output, variety, quality, equipment and equipment level, and production technology level. [0003] Welded steel pipe is also called welded pipe. Category: According to the weld, there are straight seam welded pipe and spiral welded pipe. According to the process, there are ...

AI Technical Summary

Problems solved by technology

Here, with respect to existing double straight seam welding square, rectangular steel pipe and single weld seam square steel pipe technology, the problem and deficiency of method are: 1. the welded pipe double seam of same length increases half compared with single seam welding length, welds like this Defects and impacts are relatively doubled; double seam welding has lower ergonomics than single seam welded steel pipes, more consumables, large chemical costs, heavy pollution, and high cost; double seam welding is less beautiful than single seam welded steel pipes, and has similar precision and strength worse than

2. The single-weld square steel pipe formed by cold drawing or rolling after welding of round pipes has specifications limited by molds and mechanical equipment, and steel materials are also limited by molds, mechanical equipment and high-frequency welding equipment. Narrow, with a maximum side length of 500mm and a maximum wall thickness of 16mm; at the same time, it has a greater impact on the original mechanical properties of the overall base material, and the plasticity and toughness of the material are reduced; in addition, there are also complex processes, difficult manufacturing, and finished products Low efficiency, poor work efficiency, high cost and other shortcomings and deficiencies

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