... 2. Standard:GB/T5312-------Chinese National Standard Vessel Seamless Steel Pipe1. Material: 320,360,41 0,00C rl7Nil4Mo2,0C ... ships, and I,II,III ranks pressure system pipelines, hydraulic gas transportation and bulk chemicals. Carbon steel seamless steel pipe wall ... temperature does not exceed 450 °C, alloy steel seamless steel pipe wall temperature ...