Descaling process of high-pressure water jet on the inner and outer surfaces of cold-drawn seamless steel pipe in cold state

Abstract

The cold-state descaling process of high-pressure water jets on the inner and outer surfaces of cold-drawn seamless steel pipes is a cold-state descaling process of high-pressure water jets used to remove oxide scales on the inner and outer surfaces of seamless steel pipes in the production of cold-drawn seamless steel pipes Technical field . The technical scheme of the present invention is: first descale the inner surface of the steel pipe, and then the nozzle exits the steel pipe after descaling, places the nozzle on the outer surface of the steel pipe through the lifting adjustment device, descales the outer wall of the steel pipe, and the steel pipe enters the next stage after descaling The roller table uses the water jet sprayed from the low-pressure water nozzle to clean the inner and outer walls of the steel pipe, and cleans the residual abrasive after descaling. This process has fast cleaning speed and good descaling effect. It avoids over-pickling caused by traditional pickling process. There is no damage to the inner and outer surfaces of the steel pipe and no pollution to the environment. The waste liquid can be recycled, saving costs, improving work efficiency and reducing labor. strength. This inventive process replaces the traditional pickling process in the production of cold-drawn seamless steel pipes, reduces pollution and reduces costs.

Description

technical field [0001] The invention relates to the technical field of high-pressure water jet cold-state descaling process for removing scales on the inner and outer surfaces of seamless steel pipes in the production of cold-drawn seamless steel pipes. Background technique [0002] With the acceleration of my country's seamless steel pipe production speed and the continuous expansion of construction scale, its production equipment and production technology have made great progress, but compared with some developed countries, there are still many shortcomings, some old equipment and traditional production technology are facing challenges. [0003] During the heating process of the seamless steel pipe, the oxygen, carbon dioxide, moisture, etc. in the furnace gas react and diffuse with the iron element in the steel surface layer, and a large amount of oxide scale is formed on the surface. For the next cold drawing process, the surface oxide skin should be removed, that is, th...

AI Technical Summary

Problems solved by technology

At present, traditional processes such as pickling and shot blasting are commonly used in domestic descaling. The waste acid and waste gas produced by pickling seriously pollute the environment, and are increasingly restricted by the national environmental protection.

The dust pollution caused by shot blasting is also very serious, and the surface of the steel pipe is deformed with many pits, which requires a large investment in equipment and high operating costs.

The State Intellectual Property Office of the People's Republic of China disclosed the cold stainless steel / carbon steel wire rod, bar and strip steel high-pressure water shot blasting descaling method applied by Hangzhou Iron and Steel Group Corporation on June 20, 2005 and Hunan Nonferrous Heavy Machinery Co., Ltd. The company applied for the metal wire or bar abrasive water jet descaling method and equipment on January 19, 2010. The above two open patented invention equipment and processes use high-pressure water mixture to spray onto the surface of steel, mainly used for wire, Descaling of the outer surface of bars and other products, but in the production process of seamless steel pipes, the oxide skin on the inner surface of steel pipes due to heat treatment cannot be removed, so that it cannot meet the requirements of the next cold drawing process