Scale removal spray liquid on surface of steel tube

Abstract

The invention discloses scale removal spray liquid on the surface of a steel tube, and relates to the technical field of production of the seamless steel tube, in particular to spray liquid for removing scales on the inner surface and the outer surface of the seamless steel tube. The spray liquid consists of water and garnet abrasive, wherein the particle diameter of the garnet abrasive can be 50 to 100 meshes. Because the garnet has a sharp angular appearance and can still keep the sharp angular appearance after being crushed, the garnet has extremely strong crushing force to the scale. The spray liquid is jetted to the surface of the steel tube by high pressure to remove the scales on the inner surface and the outer surface of the steel tube through high-pressure washing, so that the steel tube from which the scale is removed can be directly delivered to a user for use. The spray liquid completely substitutes the conventional acid washing process in the production of the cold-drawn seamless steel tube, so that the pollution is reduced and the cost is lowered.

Description

technical field [0001] The invention relates to the technical field of production of seamless steel pipes, in particular to a liquid spray for removing oxide scales on the inner and outer surfaces of 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, the steel pipe descaling technolog...

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