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Drill Collar

Drill Collar Usage : One of the most important components of the drill string is to provide drilling bit of pressure and the drill string rigid role. Standard : API 7, API 7-1 and SY/T standards. Material : AISI 4145 H or Non-magnetic material. Types: Slick drill collars / Spiral drill collars / Non-mag material drill collars Size : OD : 3 1/8”---11”, Length : 10’---31’ Mechanical Property: Mechanical Property of Slick and Spiral drill collars made of AISI 4145 H OD Range Yield Strength(MPa) Tensile Strength(MPa) Elongation (%) Hardness (HB) Impact Test(J) mm in 79.4~171.4 31/8~63/4 ≥758 ≥965 ≥13 285~341 ≥54 177.8~279.4 7~11 ≥689 ≥930 ≥13 285~341 ≥54 Mechanical Property of Non-mag Drill Collars OD Range Yield Strength(MPa) Tensile Strength(MPa) Elongation (%) Hardness (HB) Impact Test(J) mm in 79.4~171.4 31/8~63/4 ≥758 ≥827 ≥18 177.8~279.4 7~11 ≥689 ≥758 ≥20

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