Wire-Line Diamond Core Drill rods of BQ,NQ,HQ,PQ drill pipes
BL850,BL950
New-Era Steel Tube Specially in manufacturing cold drawn precision Seamless wire line Drill Pipes for Geological
Exploration Seamless Drill Pipes BQ/NQ/HQ/PQ,and the inner pipes and outer
casing tubes.We have the steel grade
level XJY600,XJY750,XJY850,XJY950,BL850,BL950.
The detail seamless steel pipes of
materials:SAE4130,45MnMoB,30CrMnSiA,SAE4140
SPECIFICATIONS: A519 Seamless mechanical tubing for drill rods.
1).BQ,NQ,HQ DRILL PIPES DIMENSION AND TOLERANCES (IN MM)
| Q series drill pipes | Conditions | Size mm | Quantity, units | Weight kg/pcs | Length, mm |
| BQ drill pipe | Quenched and Tempered | 55.6x46 | 500 | 18.5 | 3050 |
| NQ drill pipe | Quenched and Tempered | 69.9х60.3 | 1000 | 24.6 | 3050 |
| HQ drill pipe | Quenched and Tempered | 88.9x77.8 | 1000 | 35.3 | 3050 |
| PQ drill pipe | Quenched and Tempered | 114.3x101.6 | 500 | 47.5 | 3050 |
2).The Mechanical properies of drill pipes:
| Technical data | Tensile Strength, MPA | Yield Strength, MPA | Elongation, % | Hardness,HRC |
| 4130+SR | 730 | 620 | 14 | 22-26 |
| 30CrMNSIA+QT | 850 | 750 | 14 | 28-32 |
| 4130+QT | 950 | 850 | 13 | 30-35 |
| Deviation from straightness | Not more than 0,3 mm per 1 meter of length,total 1/6000 | |
| Deviation from straightness | Not more than 0,25 mm per 0.2 meter of length from each of the end
of pipe | |
| Tolerance for BQ drill rod | Deviation of the diameter is 55.75+0,2/-0,2mm, 46.15 +0,2/-0,2mm | |
| Tolerance for NQ drill rod | Deviation of the diameter is 70.1+0,15/-0,2mm, 60.4-0,3mm | |
| Tolerance for HQ drill rod | Deviation of the diameter is 89+0,38/-0,1mm, 78.1-0,48mm | |
| Tolerance for PQ drill rod | Deviation of the diameter is 114.3+0,50, 103.2-0,5mm | |
| Eccentricity | Not more than 7% | |
Drill pipes by Eddy Current Examination according to ASTM E309
shall be applied on all tubes using External
Longitudinal
NON-DESTRUCTIVE TEST
notch with depth of no more than 7.5% of wall thickness (maximum
notch depth 0.80mm and minimum notch
depth 0.30mm) , 0.30mm maximum width and 25mm maximum length, made
from the same chemistry and size
of tubing.
THE CORE DRILLING PIPES SURFACE CONDITION
The tubes must have smooth surface,black surface or black
phosphatized.
THE STEEL TUBES AND STEEL PIPES MARKING
The request information shall be marked on each tube with paint,
and
each bundle shall be identified with a securely attached metal tag.
STEEL TUBES AND STEEL PIPES SURFACE COATING
The tubes inside and outside shall be coated with a rust inhibitor
PACKING OF ALLOY SEAMLESS TUBES
Standard Export worthy packing, preferably in hexagonal bundle with
plastic wrapped and steel strapped.
STEEL PIPES PRODUCTS PICITURES
Tag: steel drill rod,rock drill rods,wireline drill rods,casing drill pipes,seamless steel pipes,rock
drill pipes,
BQ drill pipes,HQ drill rods,HQ drill rods
