Spiral steel pipe raw materials arrive at the factory after the first test is the steel plate tensile test, tensile test is superficially speaking, the raw material is pulled to the big stress accepted when about to break, the steel plate yielded to a certain extent, because the internal grain arrangement from scratch, its resistance to deformation and progress from scratch, at this moment deformation despite the rapid development of raw materials test equipment is all-purpose data test machine, but can only follow the stress The progress of the progress, until the stress reaches a large value.
Doing tensile test on the one hand to check the quality of raw materials, on the other hand, on their own production of spiral steel pipe also has to ensure that some raw material suppliers now spell price, resulting in a significant decline in quality, directly leading to the quality of spiral steel pipe is not guaranteed, and more affect the reputation of the company, so production manufacturers must be measured, try.
General small diameter steel pipe (refers to from 219-529) applies to the strip width between 300-550, the width of the large production bond not, and the appearance of spiral steel pipe is not beautiful, narrow width, spiral steel pipe forming difficulty, after the production of spiral steel pipe weld seam is simply no point of view, almost into a right angle, on the spiral steel pipe caliber between 529-1000 simply with 685 – 1100 plate width, on the spiral steel pipe caliber in more than 1500, must be used to roll plate.