Classification of steel pipe: steel pipe is divided into seamless steel pipe and welded steel pipe (seamed pipe). According to the section shape, it can be divided into circular pipe and special-shaped pipe. Circular steel pipe is widely used, but there are also some square, rectangular, semicircle, hexagon, equilateral triangle, octagon and other special-shaped steel pipes. Hydraulic pressure test shall be carried out for the steel pipes bearing fluid pressure to check their pressure resistance and quality. If there is no leakage, wetting or expansion under the specified pressure, it is qualified. Some steel pipes shall be subject to crimping test, expanding test, flattening test, etc. according to the standards or the requirements of the demander.<br>
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