Cold-drawn steel pipes in cold-drawn steel pipe mills belong to cold-drawn steel pipes, which are welded after bending and deformation of steel strips or steel plates into circular or square shapes. The blank used for cold-drawn steel pipe is steel plate or strip, which is classified according to welding method. Welding methods can be classified as arc welded pipe, high frequency or low frequency resistance welded pipe, gas welded pipe, cold drawn steel pipe, Bondi pipe and so on. Welded steel pipe: used in oil drilling and mining and machinery manufacturing industry, etc. Cold-drawn steel pipe: can be used as water gas pipe, large diameter cold-drawn steel pipe for high-pressure oil and gas transmission, etc. Cold-drawn steel pipe for oil and gas transmission, pipe pile, pier and so on. 按焊缝形状分类可分为冷拔钢管和冷拔钢管直缝焊生产工艺简单，生产效率高，成本低，发展较快螺旋焊强度一般比冷拔钢管高，能用较窄的坯料生产管径较大的焊管，还可以用同样宽度的坯料生产管径不同的焊管。但是与相同长度的冷拔钢管相比，焊缝长度增加30~100%，而且生产速度较低。因此，较小口径的焊管大都采用直缝焊，大口径焊管则大多采用螺旋焊。
According to the weld shape, it can be divided into cold-drawn steel pipe and cold-drawn steel pipe. The production process is simple, the production efficiency is high, the cost is low. The strength of developing faster spiral welding is generally higher than that of cold-drawn steel pipe. The welded pipe with bigger diameter can be produced with narrower blank, and the welded pipe with different diameter can also be produced with the same width blank. However, compared with cold-drawn steel pipes of the same length, the length of weld increases by 30-100%, and the production speed is lower. Therefore, most of the smaller diameter welded pipes are welded by straight seam welding, while the larger diameter welded pipes are mostly welded by spiral welding.
Cold-drawn steel pipes in cold-drawn steel pipe plant are divided into automatic submerged arc cold-drawn steel pipes and high frequency cold-drawn steel pipes. The spiral seam automatic submerged arc cold-drawn steel pipe can be divided into Class A pipe and Class B pipe according to the pressure level of the conveying medium. Class A pipes are generally welded with Q235, Q235F ordinary cold-drawn steel pipes and 16Mn ordinary low-alloy structural steel pipes. Class B pipes are welded with Q235, Q235F, Q195 and other steel pipes. They are used as spiral seams of high-frequency cold-drawn steel pipes with spiral seams for low-pressure fluid conveying pipes. There is no uniform product standard yet. Generally, Q235 ordinary cold-drawn steel pipes are used. Q235F and other steel products.
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