Also known as the "skin effect," When an alternating current through a conductor, due to induction effect caused by the larger cross section of the conductor current distribution is uneven, the closer the conductor surface current density. The skin effect increases the effective resistance of the co

In the lsaw steel pipe production process, because the primary process is in a hot state, so the heating operation is resolution product quality is very important process. The heat with the furnace, according to their results, and reheating furnace is divided into two kinds; the former is used to bi

Welded tube bending refers to long rolling (type, rod, pipe) in the longitudinal extent of the bending direction. Per meter length of the curved chord is called curvature per meter; total length of the curved with the total chord ratio is called the total length of the total curvature. Bending of al

(1) spiral boiler tube manufacturing process to determine their residual stress is large, according to foreign information records, and some even close to the yield limit, LSAW pipe boiler tube expansion process due to the use of residual stress close to zero. (2) spiral seam welding boiler pipe-lin

In recent years, China's pipeline construction ushered in a new development of the peak. At the same time, the world market for steel pipe demand increases rapidly, so a large number of steel pipe exports. Behind the production and application of this prosperity, there has been some steel pipe quali

What is casing pipe or tube?The metal pipe or tube used in drilling well or any underground installation is called casing tube or pipe. Casing pipes are used for casing oil & gas wells. In casing a large diameter pipe is assembled and is inserted into a drilled section of a bore-hole. Why is casing

1 Square tube performance index - plasticPlasticity refers to the metal material in the loading, the plastic deformation (permanent deformation) without the capacity to destroy. 2 Square tube performance index analysis - hardnessSteel pipe hardness is a pointer to measure the hardness of the metal m

In recent years, offshore deep-water dock project has been large-scale construction in the domestic coastal, as the bearing capacity of the pile of deep-water wharf, commonly used spiral weld large diameter piling pipe; In addition, bridges, roads, high-rise buildings also need piling pipe.Besides,

Oil and gas pipeline measures 14 to 42 inches in diameter, but is usually 20 to 36 inches. It is often composed of 40-foot lengths but lengths may be as long as 60 or 80 feet. The pipe is wrapped and coated for protection against corrosion, especially since it runs underground. About half of all gas

Seamless steel pipe has a very important position in China's steel industry, the low-pressure boiler tubes and high pressure boiler tubes also plays a important role in the seamless steel pipe. Their application environments are relatively poor and have requirements on temperature and pressure , so