High-precision cold-drawn tubes are one type of steel pipe, that is, one classified according to the production process, which is different from the hot-rolled (expanded) pipe. It is formed by multi-pass cold drawing in the process of expanding the diameter of the capillary tube or the raw material tube, and is usually carried out on a single-chain or double-chain cold drawing machine of 0.5 to 100T.
High-precision cold drawn pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, mechanical processing pipe, thick wall pipe, small diameter and inner die cold drawn pipe, and other steel pipes. Also included are carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless thin-walled steel pipes, and special-shaped steel pipes.
High-precision cold-drawn tube can have an outer diameter of up to 6mm, a wall thickness of up to 0.25mm, a thin-walled tube with an outer diameter of 5mm and a wall thickness of less than 0.25mm. The precision and surface quality are higher than that of hot-rolled (expanded) tubes. Restricted, its caliber and length are limited. Today we will come together to understand the characteristics of the production of cold drawn steel pipes.
1. High production efficiency: It takes 154 hours to produce a cylinder with an inner diameter of 420 mm and a length of 12 meters by the traditional method, and it takes only 4 minutes to produce by cold drawing.
2. High pass rate: Because the rolling head of the boring head also plays a guiding role, during the cutting process, the blank tube is deflected due to its own weight, causing the rolling head and the boring tool to be biased, resulting in waste. The pass rate can only reach about 60%, and the production rate can reach 95% by cold drawing method.