Currently, spiral steel pipe widely used in engineering cooling after annealing treatment to eliminate residual stress, while cooling after welding residual stress is an important process, this approach is both extravagant energy and easily produce larger welding residual stresses. Heat treatment after welding is a new technique to eliminate the residual stress. Preheated before welding the material to a heat treatment temperature after the welding process and welding pieces of heating was continued to maintain this temperature, the soldering is completed using heat insulation cotton to its slow cooling. This method can effectively reduce residual stresses, progressive metal resistance to stress corrosion performance.
Spiral steel pipe used in different industries, according to certain production processing and manufacturing processes and production together, be able to show the construction of an important role and value. Spiral plant due to increasingly higher bearing pressure pipelines, using the premise of increasingly demanding, and to try to extend the life of the pipeline. Despite the economic crisis, but the large-diameter spiral steel pipe company cited argument is resuming development, to meet a better tomorrow. Large diameter spiral pipe in the transportation of gas, transportation has played a significant role. Large diameter spiral steel pipe is mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction piling pipe, is the development of the 20 key products.
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