Pipe fitting inspection

Steel tube            According to the section shape, it can be divided into circular steel pipe and special-shaped steel pipe. Among them, circular steel pipe is the most widely used steel pipe, usually referred to as circular steel pipe. There are many kinds of special-shaped steel pipes, with different cross-section shapes (even variable cross-section steel pipes), the more commonly used ones are square and rectangular steel pipes.            The steel pipe is divided into seamless steel pipe and welded steel pipe according to the production process. The former is divided into hot-rolled seamless steel pipe and cold-rolled (cold drawn, extruded) seamless steel pipe; the latter is divided into welded steel pipe (mainly high-frequency resistance welding), gas welded steel pipe and furnace welded steel pipe according to the welding method. According to the classification of its uses, there are steel pipes for pipeline, thermal equipment, mechanical industry, high pressure vessel, geological drilling, petroleum industry, chemical industry and engineering structure, etc.            Steel pipe inspection items:            Composition analysis, tensile strength, bending strength, impact strength, expanding test, flattening test, curling test, bending of the whole pipe, hydraulic test, spot corrosion, crevice corrosion, intergranular corrosion, hydrogen sulfide stress corrosion, hydrogen induced cracking, etc