99热这里-欧亚av-色先锋av-国产草逼视频-91在线亚洲-成人性生活免费视频-午夜影院污-樱桃香蕉视频-精品久久久一区-男人天堂亚洲天堂-国产美女视频一区-欧美一级性片-av在线色-99r在线视频-一区二区的视频

     A complete set of equipment for producing pipes using cold processing methods of cold rolling, cold drawing or a combination of cold rolling and cold drawing. It is a unit for deep processing of hot-rolled pipes or welded pipes. Different processing methods and corresponding auxiliary processes are selected based on the processing performance of the metal, pipe size, quality requirements, investment and benefits.
    The basic processes of cold-rolled and cold-drawn pipes are: (1) Pipe material supply, the pipe materials used are hot-rolled finished pipes or semi-finished pipes, extruded pipes and welded pipes; (2) Pipe material preparation, including inspection, bundling, pickling, cleaning, rinsing, neutralization, and drying , coating with lubricant, etc.; (3) cold working (cold rolling or cold drawing); (4) finished product finishing including finished product heat treatment, straightening, sampling, cutting heads and tails, inspection (manual inspection and various flaw detection), hydraulic test, oiling, packaging, warehousing, etc. Different products have different finishing contents.
    Cold drawn pipe is a type of steel pipe, that is, it is classified according to different production processes, which is different from hot rolled (expanded) pipe. It is processed through multiple passes of cold drawing during the diameter expansion process of the raw tube blank or raw material pipe, usually on a 0.5 to 100T single-chain or double-chain cold drawing machine. In addition to general steel pipes, low- and medium-pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, machined pipes, thick-walled pipes, small-diameter cold-drawn pipes with internal molds and other steel pipes, cold-rolled (drawn) steel pipes also include carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless thin-walled steel pipes, and special-shaped steel pipes.
   This article is compiled and published by Baiquan Hydraulic, please indicate when reprintinghttp://m.cbtea.cn