API steel pipe is a mild steel pipe, and because of its machinability, is widely used in structural pipe and fluid pipes. However, the common problem of API steel pipe is that there are pitting spots on the surface, or it is easy to crack in late bending, squishing, and other processing, which affects the product quality of customers. These problems are also not solved by many seamless steel pipe manufacturers at present, but the steel pipe can be solved, and the main reasons are as follows: In addition to containing carbon and a certain amount of silicon and manganese for deoxidation, API-free steel pipe does not contain other alloying elements (except residual elements), so it is particularly easy to cause surface pits when perforated.

API steel pipe belongs to the United States petroleum standard pipeline pipe, pipeline pipe is extracted from the ground oil, gas, and water, pipeline pipe to the oil and gas industry enterprises. Pipeline pipe comprises seamless pipe and welded steel pipe, the pipe end has a flat end, a threaded end, and a socket end; The connection mode is end welding, collar connection, socket connection, etc.

API steel pipe quality testing is particularly important, generally, API steel pipe ultrasonic testing is divided into online and manual two kinds, online API steel pipe ultrasonic detection wave installed in the production line, the continuous production of steel pipe online detection, a number of defects will alarm, because online ultrasonic detection equipment is automatic, Therefore, the phenomenon of missing and misreporting will occur in the detection process, so each batch of API steel pipe should be manually ultrasonic pumping detection after the production line.

API steel pipe due to its special production process, the use of high-frequency welding, so the general welding defect is not fused, and because its current and voltage are controlled by the machine, a quantity of API steel pipe unfused phenomenon is usually a very long, so the ultrasonic detection of API steel pipe is easy to judge. But the inspection personnel must be required to test fast, slow speed will affect the efficiency of production, and also easy to cause an increase in steel pipe waste.

Cangzhou Shenlong Pipe Manufacturing Co., Ltd. cooperates with Baosteel and Baogang to produce large-caliber seamless steel pipe, straight-seam welded pipe, spiral steel pipe, and pipe fittings. The products comply with API, ASTM, DIN, BS, and JIS standards, and can accept SGS, BV, and other inspections. The products are used in oil, natural gas, bridge, water conservancy, and other large-scale projects, which are worthy of trust.