Compared with seamless pipe, galvanized pipe and other steel, welded pipe has some outstanding characteristics. First of all, it is very simple to judge whether there is weld on the steel surface. Because the welded pipe is made by welding, it has obvious characteristics. Secondly, the diameter of welded pipe is generally large, and the diameter of seamless pipe and galvanized pipe is relatively small. Therefore, A514 grade E QT steel plate, welded pipe is generally used in underground pipeline to transport water, gas, air, oil and heating steam with low pressure.
A514 grade E QT steel plate, 09CrCuSb steel has the following advantages: 1. The alloy ratio is optimized and rare alloy is added. The finished steel product has excellent sulfuric acid uniform corrosion resistance. 2. The content of As, Sn, Pb and other elements, and the gas content of hydrogen, oxygen and nitrogen are controlled to improve the purity of the billet. According to the analysis of many times, the grain size of the material is not coarser than grade 6. The corrosion resistance of the equipment made of 09CrCuSb steel is improved, and the maintenance cycle is relatively prolonged, which has great economic benefits.
The cold bending method is mainly used to produce cold-formed section steel and welded pipe. The cold bending method is to bend the steel strip or steel plate into various cross-section shapes by the cold bending machine in the cold state. If the A514 grade E QT steel plate steel pipe is bent into a circular, square or other hollow shape and welded by a proper welding method, it is a welded pipe. The advantages of cold bending: first, the cold-formed section steel is light in weight and large in bearing capacity, and it can save metal by replacing the hot-rolled section steel; second, it can produce all kinds of A514 grade E QT steel plate extremely thin, extremely wide and complex section steel which can not be produced by hot rolling.
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