1 GB 3087 Seamless Steel Tube for Low and Medium Pressure Boiler 2 GB 5310 Seamless Steel Tube and Pipes for High Pressure Boiler 3 GB/T 18984 Seamless Steel Pipes for Low Temperature Service Piping 4 GB/T 31940 Bi-Metal Composite Corrosion Resistance Steel Pipe for Fluid Transportation 5 GB/T 32957 Cold-drawn or Cold-rolled Precision Inside SSAW Steel Pipe Welded steel tybes for pressure purposes delivery technical conditions part5 submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties Steel Pipe for Ordinary Structure GB/T 13793 Longitudinally electric resistance welded steel pipe SY/T 5040 Spirally submerged arc welded steel pipe piles Some results are removed in response to a notice of local law requirement.For more information,please see here.12345Next