Source: https://www.derbosteelpipe.com/pipe-30inch-sch20-sch-xs-12-7mm-wall-thickness-submerged-arc-welding-100-x-ray-testing-double-butt-straight-seam-welding-material-api-5l-gr-b-psl2-bevelled-ends-11-8-meters-per-length.html
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