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Raise Boring Drill Pipe size from 8" to 15"

1. ETERNAL company specialize on manufacturing raise boring drill pipe from 8” to 15”, which is applicated to bore all kinds of tunnel and shaft. In the past years, RBM drill pipe ( drill rod )  has been exported to many countries, such ash South Africa, Brazil, Chile, Mexico, Russian, Vietnam, Korea etc, It could be installed on the machine of Sandvik, Atlas Copoc etc.


2. Size and technical specification

Main technical specification

Norminal size

Shoulder to shoulder length

Small bore diameter

Diam.of boreback

Length of

boreback

shoudler to first

spanner flat

Width of

spanner flat

Shoudler to end of spanner flats

Dimension across

spanner flat

Connections

Weight

A

B

C

D

E

F

G

H




in mm  

in mm

in mm

in mm

in mm

in mm

in mm

in mm

in mm


kg

8”203.2

48"1219.2

4-3/4“120.7

65/32"156.4

22”558.8

11/2"38.1

23/4”69.9

81/4"209.6

67/8“174.6

63/4"R.B.-DI22

170

10”254  

60”1524

4-3/4"120.7

77/16“188.9

36"914.4

11/2"38.1

23/4”69.9

81/4"209.6

8”203.2

81/4"RB-D122

345

11-1/4”286.8

60"1524

4-3/4”120.7

711/16”195.3

36"914.4

11/2"38.1

31/2”88.9

10"254

9"228

91/4"R.B.-DI22

480

12-7/8”323.9

60”1524

57/16"138.1

9”228.6

36”914.4

19/16”39.7

315/16"100

11"279

101/2”266.7

101/2"RB.-D122

640

12-7/8”323.9

120"3048

57/16"138.1

9”228.6

96”2438.4

19/16”39.7

315/16”100

11"279

101/2”266.7

101/2"R.B.-DI22

1270


3.  Production features

3.1 Choose high strength forging material, including 4140, 4330V, 4330V MOD

3.2 Through quenching and tempering heat treatment, carry out sample test on each piece drill pipe

3.3 CNC turning DI22 thread with high strength, every thread has two starts


4.    Material chemical specification  :

C: 0.28 Min./0.37 Max.        Mn: 0.45Min./0.65Max.          Si: 0.1 Min./0.3 Max.

Ni: 2 Min./3 Max.                  Cr: 0.8 Min./1.1 Max.              Mo: 0.4 Min./0.65 Max.

V: 0.05 Min./0.15 Max.


5.   Mechanical property 

Tensile strength : min 1035MPA    Yield strength : 965MPA 

Impact value :min 90J    

Surface hardness :HB325-365 


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