Structural seamless pipe. This standard is applicable to seamless steel pipe for general structure and mechanical structure. Fluid seamless steel pipe standard is applicable to general seamless steel pipe for conveying fluids. The main difference between fluid pipes and structural pipes is that fluid seamless pipes are tested by hydraulic pressure or magnetic particle detector, eddy current and magnetic flux leakage. Therefore, the thicker the wall thickness of the fluid seamless steel pipe is, the more economical and practical it is. The thinner the wall thickness is, the higher the processing cost will be. Secondly, the process of the product determines its limited performance. Generally, the accuracy of the seamless steel pipe is low: the wall thickness is not uniform. The inner and outer surface of the tube has low brightness, high cost of length fixing, and the inner and outer surface has pits and black spots which are not easy to remove. Thirdly, its detection and shaping must be off-line processed. Therefore, it embodies its superiority in high pressure, high strength and mechanical structure materials.
Cold-drawn seamless pipe has more uniform wall than hot-rolled seamless pipe, and its outer wall is more smooth and beautiful. Hot-rolled seamless pipe is generally longer than seamless pipe. Cold-drawn seamless steel pipe: 1. Cold-drawn seamless steel pipe can be produced in small batches with high precision. It can be used for precision cold-drawn seamless tubes with high dimensional accuracy and good surface finish of mechanical structure and hydraulic equipment. 2. Cold-drawn seamless steel pipe has better performance, and its metal is more dense than that of welded seam, so it can withstand greater pressure. 3. There are strict tolerances and roughness for inner and outer dimensions of cold-drawn precision steel pipe. Hot-rolled seamless steel pipe: 1. Architectural category: the most Under-ground Pipeline transportation, extraction of groundwater when building, boiler hot water transportation and so on. 2. Machining, bearing sleeve, processing machinery accessories, etc. 3. Electrical: Gas transmission, hydroelectric fluid pipeline, I hope my answer can help you.
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