Hebei long Xu pipeline equipment manufacturing Co., Ltd. is mainly used in the production of alloy elbow pipe installation of a connection pipe fittings, for the connection of the pipe bend. Connect two nominal diameter of the same pipe, so that the pipe to do 90 degrees turn. Alloy is a kind of elbow bend it referred to a variety of materials, a variety of common carbon steel, manganese steel, nickel steel etc.. Alloy elbow is widely used. Ordinary bronze alloy elbow in the general water pipeline is more common, but with the improvement of living standards, a lot of tap water pipes have to use stainless steel elbow. Manganese steel alloy steel has excellent properties due to elbow withstand shock, extrusion, material wear etc., are usually used in concrete pipes, mud pipes wear serious in pipeline. The high manganese steel pressing elbow is used in fluid flow is more intense, the impact is relatively strong in the pipeline; nickel steel material alloy elbow is usually used in high concentration oxidizing acid (nitric acid, sulfuric acid etc.) at room temperature pipeline, but in reducing acid (hydrochloric acid, sulfuric acid and so on) the transmission pipeline will be severe corrosion, unless the concentration of hydrochloric acid is very low; the ability of martensitic alloy elbow was higher at 650 DEG C high temperature strength, oxidation resistance and corrosion resistance to water vapor, but poor weldability. Therefore, it is often used in high temperature water vapor transmission pipeline, water gas pipeline