描述
For more than 10 years, Hoau has been a leading supplier of rare metals such as tantalum, niobium and its alloys. Relying on China’s abundant non-ferrous metal mine resources, it brings exquisite metal processing technology to meet customers’ requirements for non-ferrous metal materials in the fields of chemical industry, optoelectronics, aviation and other fields.
| Niobium and niobium alloy tubing grades and standards |
|---|
| category | country | grade | standard |
| tube | United States | R04200、R04210、R04251、R04261 | ASTM B394 standard |
| Niobium & Niobium Alloy Tube Chemical Composition (wt%≤) |
|---|
| element | Niobium R04200 | Niobium R04210 | NB-1% Zirconium R04251 | NB-1% Zirconium R04261 |
| C | 0.01 | 0.01 | 0.01 | 0.01 |
| N | 0.01 | 0.01 | 0.01 | 0.01 |
| O | 0.015 | 0.025 | 0.015 | 0.025 |
| H | 0.0015 | 0.0015 | 0.0015 | 0.0015 |
| zirconium | 0.02 | 0.02 | 0.8 to 1.2 | 0.8 to 1.2 |
| Ta | 0.1 | 0.3 | 0.1 | 0.5 |
| iron | 0.005 | 0.01 | 0.005 | 0.01 |
| S | 0.005 | 0.005 | 0.005 | 0.005 |
| W | 0.03 | 0.05 | 0.03 | 0.05 |
| nickel | 0.005 | 0.005 | 0.005 | 0.005 |
| mo | 0.010 | 0.020 | 0.010 | 0.050 |
| high frequency | 0.02 | 0.02 | 0.02 | 0.02 |
| titanium | 0.02 | 0.03 | 0.02 | 0.03 |
| B | 2ppm | – | 2ppm | – |
| aluminium | 0.002 | 0.005 | 0.002 | 0.005 |
| be | 0.005 | – | 0.005 | – |
| chromium | 0.002 | – | 0.002 | – |
| C | 0.002 | – | 0.002 | – |
| Niobium and niobium alloy tube sizes and tolerances |
|---|
| Outer Diameter (D)/in (mm) | Outer Diameter Tolerance/in (mm) | I.D. Tolerance/in (mm) | Wall Thickness Tolerance/% |
| 0.187 < D < 0.625 （4.7 < D < 15.9） | ± 0.004 （0.10） | ± 0.004 （0.10） | 10 |
| 0.625 < D < 1.000 （15.9 < D < 25.4） | ± 0.005 （0.13） | ± 0.005 （0.13） | 10 |
| 1.000 < D < 2.000（25.4 < D < 50.8） | ± 0.0075 （0.19） | ± 0.0075 （0.19） | 10 |
| 2.000 < D < 3.000（50.8 < D < 76.2） | ± 0.010 （0.25） | ± 0.010 （0.25） | 10 |
| 3.000 < D < 4.000（76.2 < D < 101.6） | ± 0.0125 （0.32） | ± 0.0125 （0.32） | 10 |
| Tolerances can be adjusted according to customer requirements. |
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