Weight of galvanized layer - "red line indicator"In the new national standard, the zinc layer weight of galvanized steel pipes first proposed the "bottom line requirements"! Namely: In the old version of the standard only on the basis of "negotiating terms required" on the basis of an increase of "the inte...

China National Standard GB/T3091-2015 Welded Steel Pipe for Low Pressure Fluid Transportation,Line standard scaffolding tube standard: YB/T4202-2009Raw material (strip) implementation of standards: GB/T3524-92 welded steel pipe with the implementation of GB/T13793 standards applicable to a variety of structural parts, ...