Seamless steel pipe market competition at present, due to the limitation of its production process, the production cost of seamless steel tube has been high, resulting in the gradual decline in its economic benefit. As China’s metallurgical industry technology progress, instead of the seamless steel tube new products also emergence, so new product whether meet the indicators of seamless steel tube? Between them and what is the nature of the difference? Here are two kinds of confusing products on the market, hot tension reducing the difference between steel pipe and straight seam welded pipe briefly.
1, the weld quality directly decides the quality of welded pipe, and the greatest difference between welded pipe and seamless pipe. Straight seam welded pipe after high frequency welding, straight seam cimc carbon can’t eliminate, weld and parent just join together, has not completely melt into an organic whole of yield to the test of time and high pressure. Hot tension reducing mill steel after high frequency welding pass overall 800 degrees high temperature heating, the overall annealing, then open change processing, after this series of process, weld and parent organizations have the same performance, completely melt into an organic whole, very well done from the slit to the seamless transition.
2, process of the product quality differences caused by different hot tension reducing mill steel after high frequency welding also conducted a straight seam welded pipe is no process: online to remove burrs inside and outside. of the existence of burr will affect tube fluid flow, burr blocking the normal flow of the fluid, resulting in a spiral. According to the principle of fluid mechanics, local pressure will increase, weld stress non-uniform welded pipe also greatly reduce the coefficient of insurance, hot tension reducing mill steel pipe production technology fully considers the burr is dangerous, for deburring, making it even wall thickness, and the seamless tube no difference in appearance. So from this point of view, hot tension reducing mill steel pipe also completed from the slit to the seamless transition.
Of course, the difference between the two is not just limited to the above three points, but enough to explain the straight seam welded pipe and hot tension reducing pipe, there are great differences. The latter on the basis of straight seam welded pipe and the online clearing burr, inside and outside the overall heating , deformation and a series of new processing technology, making it have a qualitative leap, can be widely used in the field of in high pressure, and straight seam welded pipe of water gas delivery can only be limited to the low pressure environment. Although there are some people for seamless steel tube, hot tension reducing steel pipe, straight seam welded pipe and understanding in the fuzzy state, but believe that with the passage of time, the practice proved that people will recognize the hot tension reducing mill steel pipe products, this unique in the seamless pipe market is more and more bigger role, create greater economic benefits for the society!
Source: Zhejiang Yaang Pipe Industry Co., Limited (www.yaang.com)