seamless steel tube seamless steel tube with Beveled End, Plastic Cap and Black Paint seamless steel tubeseamless steel tube with Bevwith Beveled End, Plastic Cap and ... : API 5L, API 5CT, AS 5CT, ASTM A106 seamless sess steel tube Steel Grade: A, B, X42, X46, X52, X56, X60, X65 ... φ140-φ381 middle straight seam seam steel pipe production line and four production lines ofφ219-φ2032 bifilar double-side ...