... 4" -28", 13.7-711.2mm 3 line pipe steel API SPEC5L: B specifications: 1/ 4" -28", 13.7-711.2mm ... for ASTM A333, GR.A, GR.1, GR. 6 grade: A, GR.7, GR.3, specifications:1/ 4" ... 711.2mm 8 Steel seamless steel pipe (heat pipe) DIN17175-1979: carbon structural steel, steel grade St35.8-St45.8/ I ... 6-720* 1-70mm 11 Low and medium pressure boiler pipe steel grade GB3087-1999, 10, 20: # #, specifications: 6-720 ...