API 5L steel pipe is used for the solid and the conveying fluid. It is not only to exchange the heat, manufacturing machinery parts and container. It can reduce light weight and saving metal 20 ~ 40%. And can realize the mechanization of factory construction. API 5l steel pipe to the national economic development and improvement of quality of human life, which is better than the other steel products. From People's Daily appliances, furniture, water supply and drainage, gas supply, ventilation and heating facilities to various kinds of agricultural machinery equipment manufacturing, the development of underground resources and so on.
Because of the API steel pipe is connected with the life of human and production activities. Of course, API steel pipe consists of inferior steel pipe and high quality steel pipe, so you should know how to identify them. Folding is formed on the surface of the pipe line, this kind of defect often throughout the entire product longitudinal. Causes of fold is due to the pursuit of the false and inferior, high efficiency, large reduction of API steel pipe. And inferior steel tube appearance often have pitted surface phenomenon. Pits was caused by worn groove steel irregular uneven defects. If you want to pursuit of profit and inferior steel pipe manufacturer, often appear groove rolling the overweight.
The surface of the inferior steel pipe are prone to scarring for two reasons when it comes to identification of API steel pipe. Firstly, the inferior API steel pipe material uneven, impurities. Secondly, the inferior material manufacturer guide equipment simply, and it is easy to stick steel, these impurities after the roll bite are prone to scarring. Easy generation and inferior material surface crack, the reason is that it's blank is adobe, adobe air, adobe after cooling. Process due to the effect of thermal stress, cracks, after rolling there is crack.
It is easy to scratch of the inferior API steel pipe, the reason is that the false and inferior steel pipe factory equipment is very simple, which is easy to produce burr, scratch steel surfaces. Deep scratches to reduce the strength of the steel. The inferior steel tube cross-section oval, because in order to save material in the factory of producing API steel pipe. The quantity of the finished product roll before two slants big, the strength of rebar is greatly decreased, but also do not conform to the standard of rebar shape size.
