Production process of cold drawn steel pipe

- Jul 08, 2019-

Cold drawn steel pipe, cold rolled steel pipe unit is a complete set of equipment for producing pipes by cold rolling, cold drawing or cold rolling combined with cold drawing. It is a unit for deep processing of hot rolled pipe or welded pipe.


Different processing methods and corresponding auxiliary processes are selected according to the processing properties of the metal, the pipe size, the quality requirements, and the investment and benefits. The basic processes of cold-rolled cold drawn tubes are: (1) pipe material supply, the pipe material used is hot-rolled finished pipe or semi-finished pipe, extruded pipe and welded pipe; (2) pipe material preparation, including inspection, bundling, acid Washing, cleaning, rinsing, neutralizing, drying, applying lubricants, etc.; (3) cold working (cold rolling or cold drawing); (4) finishing of finished products including heat treatment of finished products, straightening, sampling, cutting head and tail, inspection ( Manual inspection and various flaw detection), hydraulic test, oiling, packaging, storage, etc. Different product finishing content is different.


The production characteristics of the cold-worked pipe unit are that the pipe material is usually subjected to multiple cold deformations and work hardening from the input to the finished product. Therefore, the whole production process is composed of a plurality of preparation processes and deformation processes, and has the characteristics of reciprocating cycle, and thus the number of processes The production cycle is long, the metal consumption is large, the production efficiency is low, and the general production scale is not large.


The simultaneous deployment of cold drawing and cold rolling mills in the unit is beneficial to their respective advantages, especially for the production of high-alloy steel pipes such as stainless steel and non-deformable non-ferrous metal pipes. The cold drawing machine has a single and multiple straight stripper and a reel extubator (see reel extubation). The length of the pipe when the single cold drawing is 50m, and the length of the coil is several hundred meters. The cold drawing machine has a tonnage of at least 30kN and a maximum of 7000kN. Conventional cold-rolled pipe mills are available in two-roll cold-rolled pipe mills and multi-roll cold-rolled mills.