GB/T 9808-2008 Seamless Steel Pipe
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
| 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 | ~ |
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 | ||
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 Pictures:
Company Introduction:
FAQ:
Q: Are you trading company or manufacturer?
A: We are a professional steel pipes materials manufacturer.
Q: How long is your delivery time?
A: Generally it takes 7-14 days if the goods are in stock or 30-60 days if there is no stock, this mainly depends on quantity.
Q: Do you provide free sampleas?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment?
A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shippment.
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