Tubo de aço sem costura ms tubo api 5l tubos de aço carbono preço ASTM A106 gr.b API 5L verniz preto aço carbono tubo sem costura tubo sem costura 28 polegadas grande diâmetro sem costura
1.Black varnish painted or oil painted, 2PE.3PE on the surface.
2.Plain,square cut or beveling end by caps.
3.In hexagon or triangle buddle with steel strips.
4.Other as the customer's requires.