Drill colla

1.drill collar are according to API Spec 7-1 2.Pipe size:31/2-11。3.Length 10'--31' 4.AISI 4145 H / 41 产品详细描述 API 7-1 drill collarProduct description:1.AISI4145H or 4145HM high quality alloy steel is put to use for the material of drill collar. 2.We adopt advanced technic for full length heat treatment. Chemical composition and microelement are well controlled.3.The products are characterized by high traceability and stabe mechanical properties.

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Drill pipe
	We can supply all kinds of drill pipes that are consistent with API SPEC 5DP or SY/ 5561-92. Drill pipes can be made as customers’ requirements and be equipped with the same type of tool joints. Ad

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