Method for continuously producing medium-caliber welded tube by strip continuous casting

Abstract

The invention discloses a method for continuously producing medium-caliber welded tubes by strip continuous casting, comprising the following steps: 1) pouring thermal-state metal liquid into a bakie from a steel ladle, pouring into a molten pool formed by two water-cooled casting rolls which oppositely rotate and a side seal device via a submersed nozzle, and forming a casting band after being cooled by two water-cooled casting rolls; 2) sending the casting band into an on-line hot mill by a pinch roll to be manufactured into a hot rolling strip; 3) cooling the hot rolling strip by laminar flow, discarding and / or cropping end by the pinch roll and a flying shear device, and sending the hot rolling strip into an edge milling machine for processing edges, wherein the metal band with the edges being milled has favourable edge state; 4) sending the levelled metal band into a shaping machine set to finish shaping the welded tube; and 5) finishing welding the welded tube by the shaped metal band via high frequency. The invention effectively combines strip continuous casting technology and welded tube technology, has short technology process, low investment cost, high production efficiency, strong continuous production capability and high energy use ratio, and the production reaches the purpose of obtaining products with one heating.

Description

technical field [0001] The invention relates to a welded pipe production process, in particular to a method for continuous production of medium-diameter welded pipes by thin strip continuous casting. Background technique [0002] Thin strip continuous casting technology is a cutting-edge technology in the field of metallurgy today. It has been developed for more than 140 years since Henry Bessemer proposed this idea (US Patent 49053) in 1865, but at that time due to manufacturing technology and control technology And other related technology development is not mature enough, so that this technology is basically at a standstill. It was not realized in the continuous casting and rolling process of Al until the middle of the 20th century, which once again attracted people's attention in the field of steel manufacturing. [0003] Thin strip continuous casting integrates continuous casting, rolling, and even heat treatment, so that the thin strip produced can be formed into an i...

AI Technical Summary

Problems solved by technology

[0008] (1) The process is long. From molten steel smelting to the final steel pipe product, it needs to go through molten steel smelting-thick plate continuous casting-slab reheating-rough rolling-finish rolling-coiling-transportation-ERW production line to complete the middle diameter The manufacturing process of welded pipes occupies almost half of the entire steel plant;

[0009] (2) There are many units and equipment involved, and the capital investment cost is expensive, resulting in high production costs. Many small-scale iron and steel enterprises are unable to build medium-caliber welded pipe production lines

[0010] (3) The continuous production capacity is limited. The entire production line requires the supply of hot-rolled coils to be in place. Once the supply of hot-rolled coils is not in place, the entire production process will be stagnant

[0011] (4) The original steel strip is not preheated, and the occurrence of welding crack defects can only be avoided by reducing the speed of the high-frequency welding process, resulting in low production efficiency and large energy consumption

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