NEW-ERA STEEL TUBE TECHNOLOGY CO.,LTD
NEW-ERA STEEL TUBE HOLDING NINGBO PIPEWAY TRADE CO.,LTD
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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
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BQ drill pipes,HQ drill rods,HQ drill rods