API 5L Büyük Çaplı spiral SSAW çelik boru spiral SSAW çelik boru Çelik Sınıfı: BS:1387, EN10217:S185, S235, S235JR, S235 G2H, S275, S275JR, S355JRH, S355J2H, St12, ST13, ST14, St33, St37, ST44, ST52 ASTM 53: Gr. A, Gr B API 5L: A, B, X42, X46, X52, X56, X60, X65 X70 spiral ssaw çelik boru Standart: IS: 3589