... Tubes 1.Standard:ASTM,ASME,DIN,GB 2.Material:ZG45Cr25Ni35Nb+Microalloy,HP-Nb+MA,G1.4852 ... ) 1.Standard:ASME,ANSI,ASTM,DIN,GB2.Material: ZG45Cr25Ni35Nb+Microalloy,HP-Nb+MA,G1.4852, ... resistancePressure resistanceHigh Impact strength Reformers can be found in hydrogen, ammonia, and methanol process plants around ... the major concerns is that the tube material in the catalyst tubes is susceptible to a ...