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Seamless square and rectangular tube
Time 2014-7-28 See 1047
 

 Seamless square and rectangular tube is seamless tube as base material by changing the pulling or drawing production process changes made ​​to pull, square and rectangular tube can be divided into seamless cold drawn and hot-rolled seamless square and rectangular tube. That changed after pulling through seamless pipe, physical properties and chemical composition will change into it, and the weight is calculated according to the weight of what the theory to account for it? Because unlike seamless square and rectangular tube Rectangular straight seam pipe, straight seam steel square and rectangular tube is welded steel roll or directly from the system, so the physical properties, chemical composition or weight of the accounting equation will happen any changes. But for seamless square and rectangular tube, these will change. In terms of physical properties, elongation Rectangular seamless tube after pulling changed significantly reduced, in general are 20 or less, but the tensile strength will be enhanced to some extent, since the material does not undergo any change, the chemical any component not change. But if it is to achieve the required values ​​on the extension rate, which in the production process requires annealing, that is, after forming it, and then the molding annealed seamless square and rectangular tube, so as to ensure a seamless square and rectangular tube is not finished or elongation is reduced cracking problem occurs



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