Currently seamless increasingly competitive market, because by its manufacturing process constraints, seamless steel pipe production costs have been high, resulting in the gradual decline of its economic benefits.
Seamless hollow sections, a large number of channels for transporting fluids, steel pipe and solid bar, etc. compared to large diameter spiral steel pipe, the same torsional strength in bending, lighter, is an economic cross-section of large diameter spiral pipe , widely used in the manufacture of structural parts and mechanical parts, such as drill pipe,piling pipe, automotive drive shafts, bicycle frames and construction using steel scaffolding.
Weld quality directly determines the quality of large diameter spiral pipe, is a large-diameter spiral pipe and seamless biggest difference lies. Large diameter spiral steel pipe in two-sided submerged arc welding, the carbon can not be eliminated straight sets crevices, welds, and the mother just converge together, and not completely fused into one, unable to withstand the test of time and pressure. Hot stretch reducing the double submerged arc welded tube even after the overall temperature of 800 degrees after heating, the overall annealing, and then open the change process, through this series of processes, the weld performance has the same parent organization, completely melting as a whole, well done from a seam to seamless transition.
Of course, the difference between the two is not just limited to the above two points, but illustrates the large diameter spiral steel pipe and hot stretch reducing pipe there are still significant differences. The latter in the large diameter spiral pipe has conducted on the basis of clear internal and external burrs online, the overall heating type variable and a series of new technical processing, enabling Tianjin 316L stainless steel tube which has been a qualitative leap in the field of high pressure common use, and can only be limited to large diameter spiral pipe water under low pressure gas transmission.
Different processes resulting in differences in product quality, reducing thermal stress in double submerged arc welded steel pipe after also carried out a large-diameter spiral pipe are no external burr removal process online. The presence of burrs affect the flow of fluid inside the tube, burrs blocking the normal flow of fluid, to produce swirl. According to principles of fluid mechanics, the weld must increase local compression, discontinuity of the large diameter spiral pipe safety factor is also greatly reduced, hot stretch reducing steel production process to take full account of the risks that exist burr, burr to limit Clear, making it uniform thickness, seamless appearance with no difference. So from this point of view, hot stretch reducing pipe joints from having also completed a seamless transition to.
No comments:
Post a Comment