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 Drill Collar 

Technical Propties

Drill Collar manufactured by alloy steelheat treated wholly produced according API7-1mainly as fowllowing types: 

l      Ordinary Drill Collar

l      DC with slip groove

l      DC with elevator groove

l      DC with spiral groove

Technical Specification

OD:79.4-279.4

Length9.15 or 9.45 M, May produce as required

Merchanical Propties: 

OD(mm)

Tensile Strength(Mpa)

Yield Stength(Mpa)

Elongation(%)

Impact(J)

Hardness(HB)

31/8 - 63/4

≥ 965

≥ 758

≥ 13

≥ 54

285 - 341

7-11

≥ 930

≥ 689

≥ 13

≥ 54

285-341

 

 

 

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