... )Payment: T/T,L/C ASTMA53/A106 Gr.B/X56/X60 pipe line stockist First, the details of our products. API ... ;ASTMA333;ST37,ST42,ST52;Gr.B,X42,X46,X52,X56,X60,X65,X70, etcUsagefor petroleum/ natural gas pipeline , for conveying water ... north road, Tanggu , Tianjin , China ASTMA53/A106 Gr.B/X56/X60 pipe line stockist