S+C G1.4852 Catalyst Tubes 1.Standard:ASTM,ASME,DIN,GB 2.Material:ZG45Cr25Ni35Nb+Microalloy,HP-Nb+MA,G1.4852 3.ISO9001:2008 S+C G1.4852 Catalyst Tubes GradeC Si MnCr Ni Nb PSOtherZG45Ni35Cr25Nb+Microalloy0.40-0.50<=1.5<=1.023.0-27.033.0-37.00.7-1.5<=0.03<=0.03Ti+Zr(microelement ) 1.Standard:ASME,ANSI,ASTM,DIN,GB2.Material: ZG45Cr25Ni35Nb+Microalloy,HP-Nb+MA,G1.4852,H39WM3.Size:Length=16000mm, ...