API estándar A106 tubería de acero sin costura Gr.B A53 Gr.B / ASTM A106 Gr.B A53 Gr.B AP175-79 tubo de acero, DIN2I5L , ASTM A106 Gr.B, ASTM A53 Gr.B, ASTM A179 / A192 / A213 / A210 /370 WP91, WP11, WP22. DIN17440, DIN2448, JISG3452-54. API5L materiales,Gr.A&b, X42, X46, X52, X56, X60, X65, X70, X80, ASTM A53Gr.A&b,ASTM A106 Gr.A&b, A135 ASTM, A252 ASTM, A500 ASTM, DIN1626, ISO559, ISO3183.1 / 2, KS4602, GB / T911.1 / 2, SY / 5037,