无缝钢管是一种具有中空截面、周边没有接缝的长条钢材。钢管具有中空截面，大量用作输送流体的管道，如输送石油、天然气、煤气、水及某些固体物料的管道等。钢管与圆钢等实心钢材相比，在抗弯抗扭强度相同时，重量较轻，是一种经济截面钢材，广泛用于制造结构件和机械零件，如石油钻杆、汽车传动轴、自行车架以及建筑施工中用的钢脚手架等。用钢管制造环形零件，可提高材料利用率，简化制造工序，节约材料和加工工时，如滚动轴承套圈、千斤顶套等，目前已广泛用钢管来制造。钢管还是各种常规武器不可缺少的材料，枪管、炮筒等都要钢管来制造。钢管按横截面积形状的不同可分为圆管和异型管。由于在周长相等的条件下，圆面积最大，用圆形管可以输送更多的流体。此外，圆环截面在承受内部或外部径向压力时，受力较均匀，因此，绝大多数钢管是圆管。
Seamless steel pipe is a kind of long steel with hollow section and no joint around it. Steel pipe has hollow section, which is widely used as pipeline for conveying fluids, such as oil, natural gas, gas, water and some solid materials. Compared with solid steels such as round steel, steel pipe has lighter weight when its bending and torsional strength is the same. It is an economic section steel. It is widely used in manufacturing structural and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffolding used in construction. Manufacturing ring parts with steel pipes can improve material utilization, simplify manufacturing process, save material and processing time, such as rolling bearing rings, Jack sleeves, etc. At present, steel pipes have been widely used in manufacturing. Steel pipe is also an indispensable material for all kinds of conventional weapons. Tubes, barrels, etc. are made of steel pipe. Pipe can be divided into circular pipe and special-shaped pipe according to the shape of cross-section area. Because the circular area is the largest under the condition of equal circumference, more fluid can be transported by the circular pipe. In addition, when the ring section is subjected to internal or external radial pressure, the force is more uniform, so the vast majority of steel tubes are circular tubes.
冷拔无缝钢管的轧制方法较热轧（挤压无缝钢管）复杂。它们的生产工艺流程前三步基本相同。不同之处从第四个步骤开始，圆管坯经打空后，要打头，退火。退火后要用专门的酸性液体进行酸洗。酸洗后，磷化，涂油。然后紧接着是经过多道次冷拔（冷轧）再坯管，专门的热处理。热处理后，就要被矫直。钢管经矫直后由传送带送至金属探伤机（或水压实验）进行内部探伤。若钢管内部有裂纹，气泡等问题，将被探测出。钢管质检后还要通过严格的手工挑选。钢管质检后，用油漆喷上编号、规格、生产批号等。并由吊车吊入仓库中。
The rolling method of cold-drawn seamless steel tube is more complicated than that of hot-rolled (extruded seamless steel tube). The first three steps of their production process are basically the same. The difference is that starting from the fourth step, after the round billet is emptied, it should be first annealed. After annealing, special acid liquids are used for pickling. After pickling, phosphating and oiling. Then followed by a number of cold-drawn (cold-rolled) billet tube, special heat treatment. After heat treatment, it will be straightened out. After straightening, the steel pipe is sent to metal flaw detector (or hydraulic test) by conveyor belt for internal flaw detection. If there are cracks and bubbles in the steel pipe, they will be detected. After the quality inspection of steel pipes, strict manual selection is required. After quality inspection of steel pipes, paint is sprayed with numbers, specifications, production batches, etc. The crane is hoisted into the warehouse.
中国无缝管网宣传报道：冷拔钢管一般需要多次拉拔，在每次拉拔之间要有相应的去应力退火，保证下一次的冷拔顺利进行。从外表看冷轧无缝钢管往往是小直径的，热轧无缝钢管往往是大直径的。冷轧无缝钢管的精度高于热轧无缝钢管，价格也高于热轧无缝钢管。冷拔无缝管一般口径较小，大多在127mm以下，特别是冷拔无缝管外径的精度非常高，冷拔无缝管长度一般要短于热轧无缝管。壁厚方面冷拔无缝管要比热轧无缝管均匀。
China seamless pipeline network propaganda report: cold-drawn steel pipe generally need to be drawn many times, in each drawing between the corresponding stress relief annealing, to ensure that the next cold-drawn smoothly. From the appearance, cold-rolled seamless steel tubes are often small diameter, hot-rolled seamless steel tubes are often large diameter. The precision of cold-rolled seamless steel tube is higher than that of hot-rolled seamless steel tube, and the price is higher than that of hot-rolled seamless steel tube. The diameter of cold-drawn seamless tubes is generally smaller, mostly less than 127 mm. Especially, the accuracy of the outer diameter of cold-drawn seamless tubes is very high, and the length of cold-drawn seamless tubes is generally shorter than that of hot-rolled seamless tubes. The wall thickness of cold-drawn seamless pipe is more uniform than that of hot-rolled seamless pipe.
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