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Home>>Product>>Drill Collar & Drill Pipe

Non-magnetic Drill Collar

Mechanical Property

O.D mm	Yield Strength ó 0.2 MPa	Tensile Strength ó b Mpa	Elongation δ4 %	Reduction of area %	Charpy Akv ft.1b
79.4-171.5	≥758	≥827	≥18	50	≥50
177.8-279.4	≥689	≥758	≥20	50	≥50

Magnetic Property:
Relative magnetic conductivity<1.010 when the magnetic intensity is 1X105 /4 πNm.

Magnetic gradient<0.05μT in the area of 100mm away from the inner bore.

drill collar

Square Drill Collar

Square Drill Collar (hexagon or cubic) which is made of alloy cast irons AISI4145H can be divided into two kinds: drilling string and downhole. There are certain amount of wearable blocks which are made of 20-45 meshes wolfram carbide filings on each sides.

Square Drill Collar

Outside Diameter （in）	四方对边（in）	Inside Diameter （in）	Strength （in）
4 3/4	3 3/4	1 1/2	15/30
5 5/8	4 1/2	1 3/4	15/30
6 1/8	5	2	15/30
6 1/4	5	2	15/30
6 5/8	5 1/2	2	15/30
6 3/8	5 1/2	2	15/30
7 7/8	6 1/2	2 1/4	15/30
8 1/2	6 3/4	2 1/4	15/30
8 3/4	7	2 1/4	15/30
9 7/8	8	2 13/16	15/30

Mechanical Property

Diameter Rang		Tensile? Strength MPa	Yield Strength MPa	Elongation δ4 %	Charpy AKV J	Brinell Hardness HB
mm	in	Tensile? Strength MPa	Yield Strength MPa	Elongation δ4 %	Charpy AKV J	Brinell Hardness HB
79.4-171.4	3 1/8-6 3/4	≥965	≥758	≥13	≥54	≥285
177.8-279.4	7-11	≥930	≥689	≥13	≥54	≥285

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