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Dongying Goldenman Trading Co .,Ltd
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Drill pipe o is in accordance with API SPEC 5D，Grade E X, G S- and out diameter range from 60.3mm to 168.3mm
Drill collars are manufactured from AISI 4145H and are supplied in the" as rolled" surface finish condition. Alternative surface finishes can be provided.Drill collars are trepanned and drifted to API Spec 7
Casing and tubing are accordance with API 5CT. and primary out diameter range from 73.02mm to 508.00mm , and thickness wall range from 5.51mm to 16.13mm. steel grade H40,J55,K55,M65,L80,N80,P110 etc
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