A fine drawing process of special-shaped steel pipe

Abstract

The invention discloses a finish drawing process for a special-shaped steel tube body. The process comprises the following steps of (1) preparation of ram materials; (2) perforating treatment of a tube billet; (3) hot rolling treatment of a hollow billet; (4) drawing treatment of a hollow steel tube; (5) acid dipping of the special-shaped steel tube body; (6) sizing and reducing treatment of the special-shaped steel tube body; and (7) packaging of finished products. According to the finish drawing process, the structure is simple, the defective rate is reduced, and the cost is lowered; meanwhile, the finish drawing process is simple, the practical production requirements are met, and the comprehensive utilization rate is increased; moreover, the special-shaped steel tube body is machines more convenient and faster by strictly controlling the blanking size, the heating time, the pickling time and the pickling temperature in the technological process; the rate of later finished products is increased, and economic benefits of products are increased.

Description

technical field

[0001] The invention relates to a fine-drawing process of a special-shaped steel pipe. Background technique

[0002] The development of oil in the early 19th century, the manufacture of ships, boilers, and aircraft during the two world wars, the manufacture of thermal power boilers after the Second World War, the development of the chemical industry, and the drilling and transportation of oil and natural gas, all strongly promoted The development of the steel pipe industry in terms of variety, output and quality. The steel pipe is used to transfer fluid and powder, exchange heat and produce mechanical parts and containers, what's more it's a kind of economical steel. Using steel pipes to manufacture building structure grids, pillars and mechanical supports can reduce weight, save metal by 20-40%, and realize factory-like mechanized construction. The use of steel pipes to manufacture highway bridges can not only save steel and simplify construction, but also...