Ming Drill Rods SAE4130 Steel Drill Pipes
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 tubes and outer casing tubes.We have the steel grade
level XJY600,XJY750,XJY850,XJY950,BL850,BL950.
The detail steel pipes of materials:SAE4130,45MnMoB,30CrMnSiA,SAE4140
SPECIFICATIONS: ASTM A519 WITH FOLLOWING REQUIREMENTS.
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 mother pipe | Quenched and Tempered | 55.75x4.8 | 500 | 18.5 | 3000 |
| NQ mother pipe | Quenched and Tempered | 70.1х5.0 | 1000 | 24.6 | 3000 |
| HQ mother pipe | Quenched and Tempered | 89.0x5.6 | 1000 | 35.3 | 3000 |
| PQ mother pipe | Quenched and Tempered | 114.3x5.8 | 500 | 47.5 | 3000 |
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 mother pipe | Deviation of the diameter is 55.75+0,2/-0,2mm, 46.15 +0,2/-0,2mm | |
| Tolerance for NQ mother pipe | Deviation of the diameter is 70.1+0,15/-0,2mm, 60.4-0,3mm | |
| Tolerance for HQ mother pipe | Deviation of the diameter is 89+0,38/-0,1mm, 78.1-0,48mm | |
| Tolerance for PQ mother pipe | Deviation of the diameter is 114.3+0,50, 103.2-0,5mm | |
| Eccentricity | Not more than 7% | |
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 RODS SURFACE CONDITION
The tubes must have smooth surface,black surface or black phosphatized.
THE 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.
TUBES PIPES SURFACE COATING
The tubes inside and outside shall be coated with a rust inhibitor
PACKING OF ALLOY TUBES
Standard Export worthy packing, preferably in hexagonal bundle with plastic wrapped and steel strapped.
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
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