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See the following table for mechanical properties for steel grade Z140 in DS-1.


Drill Pipe Spec. Steel Grade Yield Strength (MPa) Tensile Strength (Mpa) Charpy V-notch Impact Energy (J)
Specimen Size: 10X10
Min. Max. Min. Average of 3 specimens Single Reading
DS-1 Z140 966 1103 1034 54 47

Mechanical property test results for DHDT D24 and D130 actual drill pipes are as follows:





Tensile Properties of DHDT D24 and D130 Actual Drill pipes


Drill pipe Size Steel Type Condition Sampling Location Sampling Direction Specimen Type Specimen Size(mm) Steel Grade Rt0.7 Rm Elongation
D24x40 60.3x7.1 4124M Q+T Drill pipe body Longitudinal Strip 19.00
19.00
Z140 1035
1038
1110
1130
14
17
D24x40 60.3x7.1 4124M Q+T Tool joint box Longitudinal Round-bar φ12.5 Z140 1127
1131
1200
1190
17
16
D24x40 60.3x7.1 4124M Q+T Tool joint pin Longitudinal Round-bar ̶φ12.5 Z140 1126
1137
1210
1210
17
17
D130x150 89x12 4124M Q+T Drill pipe body Longitudinal Strip 19.00
19.10
Z140 1059
1043
1130
1120
21
21
D130x150 89x12 4124M Q+T Tool joint box Longitudinal Round-bar φ12.5 Z140 1104
1110
1190
1190
17
17
D130x150 89x12 4124M Q+T Tool joint pin Longitudinal Round-bar φ12.5 Z140 1082
1099
1170
1180
18
19

Charpy V-notch Impact Energy of DHDT D24 and D130 Actual Drill Pipes


Drill pipe D24x40 D130x150
Dimensions of Drill Pipe Body(ODX Wall Thickness) 60.3x7.1(mmxmm) 88.9x12(mmxmm)
Dimensions of Upsetting End(ODX ID) 67x22(mmxmm) 111x48(mmxmm)
Condition of Pipe Body and Upsetting End Q+T Q+T
Steel Grade of Drill Pipe Body and Upsetting End Z140 Z140
Test Method ASTM A370 ASTM A370
Test Temperature Room temperature Room temperature
Sampling Direction Longitudinal Longitudinal
Sampling Location Upsetting End Pipe Body Upsetting End Pipe Body
Sampling Size 10x10x55(mmxmmxmm) 10x5x55(mmxmmxmm) 10x10x55(mmxmmxmm) 10x7.5x55(mmxmmxmm)
Measured Single Value 106 120 118 60 64 62 62 88 64 65 67 66
Average Value from 3 Samples 114 62 71 66

Conclusion: Tensile properties of DHDT drill pipes meet completely with the requirements of grade Z140 in DS-1. Their Charpy V-notch impact energy is much higher than the requirement stipulated in DS-1. High strength and high toughness has been achieved. Grade V-150 drill pipe is under development and can be supplied to the market in the near future

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