Market analysis of ERW casing1.1 Seller's Market of ERW Settlement1. l. I. Production status of ERW casing abroadThe production of foreign ERW casing is the same as its use, and it is roughly divided into three stages:The first stage is the start of production and testing of ERW casing.At the same t

Application of ERW welded pipe1.1 Application of foreign ERW casingThe United States was the first country to use ERW casing and the country that used it the most. The development process of ERW casing application can be roughly divided into three stages:The first stage is when ERW casing begins to

1. 1 Technical advantages of ERW casing (compared to seamless casing) (1) High dimensional accuracyThe ERW casing adopts a mechanical sizing process after forming, so that the accuracy of its dimensions (outer diameter, wall thickness, roundness, etc.) is improved compared with that of the jointed c

Analysis of the reasons why double-sided submerged arc straight seam steel pipes are widely used:(1) Since it is a straight weld, the weld is short, so the chance of defects is small.(2) The welding seam is a straight line, which has little effect on the coating of anticorrosive materials.(3) There