S+C G1.4852 Catalyst Tubes 1.Standard:ASTM,ASME,DIN, ... :ZG45Cr25Ni35Nb+Microalloy,HP-Nb+MA,G1.4852 3.ISO9001:2008 S+C G1.4852 Catalyst Tubes GradeC Si MnCr Ni Nb ... .0-27.033.0-37.00.7-1.5<=0.03<=0.03Ti+Zr(microelement ) 1.Standard:ASME,ANSI,ASTM,DIN ... early stages of growth is essential for safe plant operation. S+C G1.4852 catalyst tubes