Distinguish straight seam steel pipes by the outer diameter
Small-diameter straight seam steel pipes with an outer diameter between φ4.76-φ12.70 mm; small-diameter straight seam steel pipes with an outer diameter between φ13-φl14 mm; medium-diameter steel pipes with an outer diameter between φ114-φ406 mm Straight seam steel pipe; large-diameter straight seam steel pipes with an outer diameter greater than φ406 mm.
Welded steel pipes are distinguished by wall thickness
Welded pipes can be classified into the following five categories according to the ratio of the wall thickness t to the outer diameter D of the steel pipe: (1) those with t/D less than 2% are ultra-thin-walled pipes; (2) those with t/D equal to 2-5% are thin-walled pipes; (3) t/D Those with more than 5-12% are ordinary wall pipes; ④ those with t/D greater than 12-18% are thick-wall pipes; ⑤ those with t/D greater than 18% are special-wall pipes.
Thin-walled tubes, normal-walled tubes, and thick-walled tubes are not conceptually distinguished by the value of wall thickness. However, some standards have three different wall thicknesses corresponding to the same outer diameter. The pipes with these three wall thicknesses may be named thin-walled pipes, ordinary wall-thickness welded pipes, and thickened straight seam steel pipes in this standard.
Because of the special functions such as corrosion resistance, oxidation resistance, and anti-static properties of the straight seam welded steel pipe, as well as the beauty and durability of the straight seam, welded steel pipe, it has gradually become a trend to use it to make some machinery, components, and springs. With the continuous maturity and stability of the technological process, the "Xiangyang" industrial product straight seam welded steel pipe, which has been developing and growing in recent years, is gradually infiltrating into practical hardware, construction, and decoration industry and other industries with its function and polynomial function. field. And as people become more familiar with it, its demand will become more and more rapid, and its application field will become broader and broader. Another example is the widely used welding rod and a large number of stainless steel components, connectors, etc., whose fields have also been widely occupied by straight seam welded steel pipes. In addition, with the development and rational use of high-tech products, the application range of straight seam welded steel pipes is also further expanding. And the equipment transformation of the chemical fiber industry.