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GB/T 9808-2008 Seamless Steel Pipe for Geological Drill and Mining Tubing
Product Description:
This standard specifies the drilling seamless code, ordering content, dimensions, Weight, , technical requirements, test methods, marking and quality certification, packaging, appearance inspection rules. This standard applies to the geological core drilling, well drilling, hydrogeological drilling, engineering drilling casing material, core tube materials and materials with seamless steel casing collar, ordinary drill pipe tool joints feed materials and seamless steel pipes, steel particles Drill material seamless steel pipe, rope coring drill pipe tool joints feed materials and seamless steel pipes, drill collars, drill collar lock connector feed materials and seamless steel pipes.
Chemical Compositon
| CHEMICAL COMPOSITION % max | |
| P | S |
| 0.030 | 0.030 |
Bending Degree
| Nominal Wall Thickness/mm | Bending Degree/(mm/m) |
| ≤15 | ≤1.5 |
| ＞15 | ≤2.0 |
The bending degree of the wire-line drill rod is not larger than 1.0 mm per meter.
Tolerance
| Standard | Producton Method | Tube Size | Tolerance | |
| GB/T 9808-2008 | Hot rolled | OD | (+1.0%D) +0.65 (-0.5%D) -0.35 | |
| WT | ≤10 | (+15%S) +0.45 (-10%S) -0.35 | ||
| >10 | (+12.5%S, -10%S) | |||
| Cold Drawn | OD | ±0.50%D or ±0.20 | ||
| WT | ±8%S or ±0.15 | |||
| Q(N)/ T118-2010 | Cold Drawn | OD | OD | ±0.40%D or ±0.20 |
| WT | WT | ±7%S or ±0.15 | ||
Chemical composition
| Stee Grade | C | Si | Mn | P max | S max | Cu max | Cr | Mo | B |
| T600 (45MnMoB) | 0.43-0.48 | 0.17-0.37 | 1.05-1.35 | 0.02 | 0.015 | 0.20 | ~ | 0.20-0.25 | 0.001- 0.005 |
| T750 (30CrMnSiA) | 0.28-0.34 | 0.90-1.20 | 0.80-1.10 | 0.02 | 0.015 | 0.20 | 0.8-1.1 | ~ | ~ |
| T850 4140 | 0.38-0.43 | 0.17-0.35 | 0.70-0.90 | 0.02 | 0.015 | 0.20 | 0.9-1.1 | 0.15- 0.25 | ~ |
Testing items and sampling quantity for steel tube
| Serial number | Testing item | Sampling quantity |
| 1 | Chemical composition | 1 sample from each furnace |
| 2 | Tensile test | 1 sample from each batch |
| 3 | Ultrasonic examination | All |
| 4 | Eddy current test | All |
| 5 | Magnetic flux leakage test | All |
Grade comparison table
| This standard | JIS G 3465-2006 | Related industry standard |
| ZT380 | — | DZ240 |
| ZT490 | — | DZ250 |
| ZT520 | STM-R780 | — |
| ZT540 | — | DZ255 |
| ZT590 | — | DZ260 |
| ZT640 | — | DZ265 |
| ZT740 | — | DZ275 |
Mechanical Properties:
| Steel | Tensile Strength Mpa | Yield Point Mpa | Elongation % | Heat treatment |
| Grade | min | |||
| ZT380 | 640 | 380 | 14 | Normlized |
| ZT490 | 690 | 490 | 12 | Normlized |
| ZT540 | 740 | 590 | 12 | Normlized |
| ZT590 | 770 | 590 | 12 | Normlized |
| ZT640 | 790 | 640 | 12 | QT |
| ZT740 | 840 | 740 | 10 | QT |
| T850 | 950 | 850 | 15 | QT |
Product Picture:
Package and Delivery:
Q: Are you trading company or manufacturer ?
A: A professional steel pipes materials inventor, manufacturer and solution provider
A: Generally it is 7-14 days if the goods are in stock. or it is 30-60 days if the goods are not in stock, it is according to quantity.
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30%
T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact us.
GB/T 9808 -2008 Seamless Steel Pipe for Geological Drill and Mining Tubing
