API mild steel pipe is widely used in lots of industries. However, a lot of customers still don't know kinds of API steel pipe and their usage. Here we are instroduce you the detail of API steel pipe.

API line steel pipe

API line steel pipe is the line pipe that meets the American Petroleum standard. Line pipe is used for transportation of oil, gas and water to the oil and gas industry enterprises. Ends of pipe include plain end, threaded end and socket end; their connections concludes end welding, coupling, socket connections. With the development of technology, API line steel pipe's range of applications is expanding gradually, especially in the large-diameter disaster. Coupled with the factor of cost, welded pipe have a dominant position in the field of line pipe, limiting development of stainless steel seamless line pipe. During 2004, production of seamless line pipe is about 400,000 t, ranging from X42 to X70. API line steel pipe is divided into onshore line steel pipe and subsea line steel pipe. The production of high grade line steel pipe is currently adopting micro-alloying heat treatment technology. The cost of stainless steel seamless pipe is significantly higher than welded pipe. On the other hand, with the increase of steel grade, conventional technology of seamless steel pipe is difficult for producer to meet users' requirements. At present API line steel pipe production plant are carrying out research work in order to improve its pipeline corrosion resistance and stable performance in the environment of low or high temperature.

API seamless steel pipe

API seamless steel pipe is a kind of long bar without seams around. This kind of pipe has hollow sections. It is widely used for conveying fluids, such as oil, natural gas, gas and water. Manufacturing annular parts with API seamless steel pipe can improve utilization of material, simplify the process of manufacturing and save time of machining, such as bearing rings, jack sets etc. API seamless steel pipe is widely used for producing them. Compared to other materials, galvanized seamless steel pipe is lighter when they have same torsional strength. It is an economic cross-section steel, so it is widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive drive shafts, bicycle frames and construction using steel scaffolding etc.

API welded steel pipe

API straight seam steel pipe includes LSAW steel pipe and ERW straight seam steel pipe. In general API straight seam steel pipe are used for exploring. Painting, beveling, adding a cap and baling are important after finishing production. API straight seam steel pipe allows the existence of minor defects. Generally, the length of steel pipe exported is less than six meters because of the restriction of container size.