According to metal processing performance, pipe size, quality requirements and investment and benefit, different processing methods and corresponding auxiliary processes are selected. The basic processes of cold-drawn seamless steel pipe and cold-drawn seamless steel pipe are: (1) pipe material supply, using hot-rolled seamless steel pipe finished pipe or semi-finished pipe billet, extrusion pipe and welded pipe; (2) pipe material preparation, including inspection, bundling, pickling, cleaning, washing, neutralization, drying, coating lubricant, etc.; (3) cold processing (3) cold processing Cold rolling or cold drawing; (4) Finishing of finished products includes heat treatment, straightening, sampling, cutting head and tail, inspection (manual inspection and various flaw detection), water pressure test, oiling, packaging, storage, etc. Different products have different finishing contents.
A complete set of equipment combination for pipe production by cold rolling and cold drawing. It is a deep processing unit for hot-rolled pipe or welded pipe.
The production characteristics of cold-drawn seamless steel pipe processing unit are that the pipe material usually undergoes many cold deformation and hardening processes from input to finished product. Therefore, the whole production process is composed of several preparation processes and deformation processes, and has the characteristics of reciprocating cycle. As a result, there are many processes, long production cycle and large metal consumption. Low productivity, high precision, bright and smooth inner and outer surface, no peeling, no cracks, no pits. 冷拔无缝钢管性能与作用
Performance and Function of Cold Drawn Seamless Steel Pipe
1 、自重轻、强度高，运输安装方便。采用纤维缠绕生严的夹砂玻璃钢管道，其比重在 1.65-2.0 ，只有钢的 1 / 4 ，但冷拔无缝钢管的环向拉伸强度为 180 - 300MPa ，轴向拉伸强度为 60 - 15OMPa ，近似合金钢。因此，其比强度(强度/比重)是合金钢的 2 一 3 倍。这样它就可以接用户的不间要求，设计成满足各类承受内、外压力要求的管道。对于相同管径的单重。 FRP 管只有碳素钢管(钢板卷管)的 1/2.5 ，铸铁管的 1/3.5 ，预应力钢筋水泥管的 1/8 左右，因此运输安装十分方便。冷拔无缝钢管道每节长度 12 米，比混凝土管可减少三分之二三财接头。它的承插连接方式，安装快捷简便，同时降低了吊装费用，提高了安装速度。
1. Light weight, high strength, convenient transportation and installation. The proportion of fibre-wound sand-filled FRP pipe is 1.65-2.0, only 1/4 of steel, but the circumferential tensile strength of cold-drawn seamless steel pipe is 180-300 MPa, and the axial tensile strength is 60-15 OMPa, which is similar to alloy steel. Therefore, the specific strength (strength/specific gravity) of the alloy steel is 23 times as high as that of the alloy steel. In this way, it can meet the user's uninterrupted requirements and be designed to meet all kinds of pipelines to withstand internal and external pressure requirements. For the same diameter of the single weight. FRP pipe is only 1/2.5 of carbon steel pipe (steel coiled pipe), 1/3.5 of cast iron pipe and 1/8 of pre-stressed reinforced concrete pipe. Therefore, transportation and installation are very convenient. The length of cold-drawn seamless steel pipe is 12 meters per section, which can reduce two-thirds of the financial joints compared with concrete pipe. Its socket connection mode is fast and simple to install, while lowering the hoisting cost and improving the installation speed.
2, anti pollution and anti borer. The surface of unsaturated polyester resin is clean and smooth, and it will not be contaminated by shellfish, fungi and other microbial stations in ocean or sewage, so as to increase roughness, reduce cross-section and increase maintenance costs. Cold-drawn seamless steel pipes are clean for long-term use without these pollution. At the same time, because of its smooth inner wall and excellent corrosion resistance, it will not produce scales and microorganisms, effectively ensure the water quality and maintain the stability of water resistance. However, the traditional pipe still has the phenomenon of increasing water resistance and surface scaling in the future.
3 、耐热性、抗冻性好。在一 30 ℃状态下，仍具有良好的韧性和极高的强度，可在一 50 ℃- 80 ℃的范围内长期使用，采用特殊配方的树脂还可在 11O ℃以上的温，及工作。
3. Good heat resistance and frost resistance. Under the condition of 130 C, it still has good toughness and extremely high strength. It can be used for a long time in the range of 150 - 80 C. The resin with special formulation can also work at temperature above 11O C.
4. It has good corrosion resistance and has no effect on water quality. Cold-drawn seamless steel pipe can resist the erosion of acid, alkali, salt, seawater, untreated sewage, corrosive soil or groundwater and many chemical fluids. Compared with the traditional pipe, its service life is longer, and its design service life is generally more than 50 years. For sand-laden FRP pipe, it is more used in municipal and urban transportation and distribution network. Because of its non-toxic, rustless, tasteless, no secondary pollution to water quality, no need for corrosion protection, long service life, simple installation and other advantages, it is welcomed by the water supply and drainage industry.
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