NEW-ERA STEEL TUBE TECHNOLOGY CO.,LTD
NEW-ERA STEEL TUBE HOLDING NINGBO PIPEWAY TRADE CO.,LTD
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Seamless Drill Pipes SAE4130 Geological Exploration Seamless Drill Pipes BQ/NQ/HQ
THE DRILL PIPES PRODUCED BY COLD DRAWN SEAMLESS ALLOY STEEL
TUBES FOR WIRE-LINE DRILL RODS,CORE BARREL,CASING PIPES.
THE STEEL NORM:ISO10097-1 WIRELINE DIAMOND CORE DRILLING PIPES ,
DCDMA DRILL STEEL PIPES,BS4019 ROCK DRILLING PIPES,METRIC DRILLING
RODS,ASTM A519 SEAMLESS ALLOY STEEL TUBING FOR ROCK DRILLING RODS.
STEEL GRADE: SAE/AISI4130,SAE4140,SAE1541,1045,St52.3
SPECIFICATIONS: ASTM A519 WITH FOLLOWING REQUIREMENTS.
THE DRILL TUBING MECHANICAL PROPERTIES:
| Tensile Min | 725MPa |
| Yield Min | 620MPa |
| Elongation (50.8mmG.L) | Min 15% |
| Hardness | 230-280 HB |
| Condition | Stress relieved. |
| Straightness better than: | 1 in 2000 MAX (1MM DEVIATION IN 2000MM) |
| Eccentricity (Max) | 5% |
| Grain size | ≥ 9 according to ASTM E112 |
| Residual Hoop stress | <80Mpa according to ASTM E1928-99 |
BQ,NQ,HQ DRILL PIPES DIMENSION AND TOLERANCES (IN MM)
| SR.NO. | OUTSIDE DIA | TOLERANCE | INSIDE DIA | TOLERANCE | WT | LENGTH (+5/-0) |
| 1 | 55.56 | +0.18/-0 | 46.20 | +0/-0.18 | 4.68 | 3070 |
| 2 | 69.85 | +0.20/-0 | 60.32 | +0/-0.20 | 4.765 | 3070 |
| 3 | 88.90 | +0.25/-0 | 78.00 | +0/-0.25 | 5.45 | 3070 |
NON-DESTRUCTIVE TEST
Eddy Current Examination according to ASTM E309shall be applied on all tubes using External Longitudinal
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
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