... standards: ASTM/ASME Features:1) O.D seamless pipes (nominal to 48")2) Wall thickness up to 3.15"Available Specification as below ... .12Cr2MoWTiB(R102)9.A106B(ST45.8/III,20G)10low tem seamless steel tubeA333(A334) Gr.1,Gr.6,Gr.311.High ... , B ,X42 ,X46 ,X52 ,X56 ,X60 ,X65 ,X70 and X80 Seamless Pipes and Tubes (Big O.D. and Heavy Wall Thickness)