Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
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GOST 9941-81 12X18H9T 12X18H10T 12X18H12T Cold And Warm-Deformed Seamless Tubes
GOST 9941-81 is a standard that specifies the requirements for seamless steel tubes in Russia. This standard is used to ensure that the tubes meet specific criteria regarding their dimensions, tolerances, and technical requirements.
Seamless tubes, as described by GOST 9941-81, are typically used in high-pressure applications, such as in the oil and gas industry, power plants, and various industrial machinery where strength and durability are critical.
| Outside Diameter, mm | Tolerance | ||
|---|---|---|---|
| Normal | High | Higher | |
| 5≤OD≤10 | ±0.3mm | ±0.2mm | ±0.15mm |
| 10＜OD≤30 | ±0.4mm | ±0.3mm | ±0.2mm |
| 30＜OD≤95 | ±1.2% | ±1.0% | ±0.8% |
| OD>95 | ±1.0% | ±1.0% | ±0.8% |
Wall thickness & Tolerance
| Wall Thickness, mm | Tolerance | ||
|---|---|---|---|
| Normal | High | Higher | |
| 0.2 | ±0.05mm | ±0.03mm | – |
| 0.3≤WT≤0.4 | ±0.07mm | ±0.05mm | – |
| 0.5≤WT≤0.6 | ±0.10mm | ±0.07mm | – |
| 0.7≤WT≤1 | ±0.15mm | ±0.10mm | – |
| 1＜WT≤3 | +12.5/-15% | ±12.5% | +12.5/-10% |
| 3＜WT≤7 | ±12.5% | +12.5/-10% | ±10% |
| WT>7 | +12.5/-10% | ±10% | – |
Mechanical Properties
| Steel grade | Point of maximum load δВ, N/mm2 (kgf/mm2) | Elongation δ5, % | Density ρ, g/cm3 |
|---|---|---|---|
| No less than | |||
| 08Х17Т | 372 (38) | 17 | 7.70 |
| 08Х13 | 372 (38) | 22 | 7.70 |
| 12Х13 | 392 (40) | 22 | 7.70 |
| 12Х17 | 441 (45) | 17 | 7.70 |
| 15Х25Т | 461 (47) | 17 | 7.60 |
| 04Х18Н10 | 490 (50) | 45 | 7.90 |
| 08Х20Н14С2 | 510 (52) | 35 | 7.70 |
| 10Х17Н13М2Т | 529 (54) | 35 | 8.00 |
| 08Х18Н12Б | 529 (54) | 37 | 7.90 |
| 10Х23Н18 | 529 (54) | 35 | 7.95 |
| 08Х18Н10 | 529 (54) | 37 | 7.90 |
| 08Х18Н10Т | 549 (56) | 37 | 7.90 |
| 08Х18Н12Т | 549 (56) | 37 | 7.95 |
| 08Х17Н15М3Т | 549 (56) | 35 | 8.10 |
| 12Х18Н10Т | 549 (56) | 35 | 7.95 |
| 12Х18Н12Т | 549 (56) | 35 | 7.90 |
| 12Х18Н9 | 549 (56) | 37 | 7.90 |
| 17Х18Н9 | 568 (58) | 35 | 7.90 |
| 08Х22Н6Т | 588 (60) | 20 | 7.60 |
| 05ХН28МДТ | 490 (50) | 30 | 7.96 |
Appliacation
Heating exchanger
Water Supply Systems
Steel Plant
power Plant
Architectural Construction
paper & pulp industry
