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Help CenterGB/T 9808 Seamless Steel Tube – Drilling Operations Grades ZT380, ZT490, ZT520, ZT590, ZT640, ZT740
Product Spotlights
Grades ZT380, ZT490, ZT520, ZT590, ZT640, ZT740 – Current Standard: GB/T 9808-2023
OD: 6mm – 256mm | WT: 1mm – 18mm
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GB/T 9808 Seamless Steel Tube – Drilling Operations
Grades ZT380, ZT490, ZT520, ZT590, ZT640, ZT740 – Current Standard: GB/T 9808-2023
Product Overview
GB/T 9808 seamless steel tubes for drilling operations – geological core drilling, water well drilling, oil & gas exploration, and engineering drilling.
Current Standard: GB/T 9808-2023 (effective July 1, 2024)
Grades: ZT380, ZT490, ZT520, ZT590, ZT640, ZT740
OD: 21.3mm – 660.4mm | WT: 1.0mm – 30mm
✅ GB/T 9808-2023 – current standard (replaces GB/T 9808-2008)
✅ Seamless – for drilling integrity
✅ ZT380 – ≥380 MPa yield, ≥640 MPa tensile – most economical
✅ ZT740 – ≥740 MPa yield for deep drilling
✅ Impact tested – ≥39 J/cm²
✅ EN 10204 3.1 MTC with heat number
Grade Selection – Drilling Applications
| Grade | Yield (MPa) | Tensile (MPa) | Impact (J/cm²) | Application |
|---|---|---|---|---|
| ZT380 | ≥380 | ≥640 | ≥39 | General drilling – most popular |
| ZT490 | ≥490 | ≥690 | ≥39 | Water well drilling |
| ZT590 | ≥590 | ≥770 | ≥39 | Wire-line drill pipes |
| ZT640 | ≥640 | ≥790 | ≥39 | Heavy duty drill pipes |
| ZT740 | ≥740 | ≥840 | ≥39 | Drill collars, deep drilling |
Most Popular Sizes – Drilling Tubes
| OD (mm) | WT (mm) | Grade | Application |
|---|---|---|---|
| 50 | 4.0 – 6.0 | ZT380 | Small bore drilling |
| 60 | 4.0 – 8.0 | ZT380, ZT490 | Standard drill pipes |
| 73 | 5.0 – 10.0 | ZT490, ZT520 | Wire-line drill pipes |
| 89 | 6.0 – 12.0 | ZT590, ZT640 | Heavy duty |
| 114 | 8.0 – 15.0 | ZT640, ZT740 | Drill collars |
Contact
📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website:
Tags: GB/T 9808 Drilling Steel Tube Seamless Steel Pipe ZT380 ZT490 Drill Pipe Chinese Standard
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