Tube for Geological Drilling

Tube for Geological Drilling

Uses
Ground drilling pipe is a steel pipe for geological departments to drill core, mainly including geological drill pipe, geological casing, core pipe, drill collar, active drill pipe and bit.

Standard

GB/T 9808 Seamless Steel Pipe for Drilling

YB/T 235 Steel Pipe for Geological Drilling

YB/T 528 Oil Drilling Pipe

YB/T 691 Seamless Pipe for Oil Drill Collars

Product Size
Outer Diameter: 73.02mm~219.1mm
Wall Thickness: 6.25mm~20.0mm
Length: 6.0m~12.0m

Dimension Tolerance
Deviation of Outside Diameter: -0.5%D~+1.0%D
Deviation of Wall Thickness: -10%S~+12.5%S
Bending Degree: ≤1.5mm/m

Chemical Composition (%)

**Chemical Composition of Tube for Geological Drilling**
Material	Grade	C	Si	Mn	P	S	Cu	Cr	Ni	Mo	V	B
45MnB	DZ40 (ZT380)	0.42-0.49	0.2-0.4	1.1-1.4	<0.04	<0.04						0.001-0.0035
50Mn	DZ40 (ZT380)	0.48-0.56	0.17-0.37	0.7-1.0	<0.04	<0.04
40Mn2	DZ50 (ZT490)	0.37-0.44	0.2-0.4	1.4-1.8	<0.04	<0.04
40Mn2Si	DZ50 (ZT490)	0.37-0.45	0.4-0.7	1.3-1.8	<0.04	<0.04
45MnMoB	DZ60 (ZT590)	0.41-0.49	0.17-0.37	0.9-1.2	<0.04	<0.04				0.2-0.3		0.001-0.005
42MnMo7	STM-R780 (ZT520)	0.38-0.45	0.15-0.35	1.55-1.85	<0.025	<0.02	<0.2	<0.3	<0.3	0.15-0.2
36Mn2V	STM-R780-1	0.35-0.4	<0.65	1.3-1.7	<0.025	<0.02					0.08-0.2

Mechanical Properties

**Mechanical Properties of Tube for Geological Drilling**
Grade	Elongation	Yield Strength	Tensile Strength
DZ40	14	380	640
DZ50	12	490	690
DZ60	12	590	770
STM-R780	15	520	780
STM-R780-1	15	520	780
DZ75	10	740	840
DZ85	10	840	940
DZ95	10	940	1030

Back