I. Introduction of niobium tube
Brand number: R04200, R04210
Purity: ≥99.95%, 99.99%
Standard: ASTM B394
Density: 8.57g/cm 3
Status: hard, semi-hard, soft
Two, niobium tube application field
Used for heat exchange tubes in heat exchangers. Thermometer protection tube for petrochemical industry. Corrosion resistance, high temperature resistance industry aerospace, electronics industry.
Three, chemical composition
| Chemical composition（％） | ||||||||||||
| brand | Main element | Impurity content (≤) | ||||||||||
| Nb | Fe | Si | Ni | W | Mo | Ti | Ta | O | C | H | N | |
| Nb1 | Bal | 0.004 | 0.004 | 0.002 | 0.005 | 0.005 | 0.002 | 0.05 | 0.012 | 0.0035 | 0.0012 | 0.003 |
| Nb2 | Bal | 0.01 | 0.01 | 0.005 | 0.02 | 0.01 | 0.004 | 0.07 | 0.015 | 0.0050 | 0.0015 | 0.008 |
Four, mechanical properties
| brand | Minimum tensile strength (MPa) | Minimum yield strength (MPa) (0.2% residual deformation) | Minimum elongation (%) (25.4mm measurement) |
| R04200，R04210 Nb1，Nb2 | 125 | 85 | 25 |
5. Niobium tube tolerance (mm)
| Outside diameter | Outside diameter tolerance | Wall thickness tolerance |
| 1~20 | 0.01 | ±5% |
| 20~25 | 0.05 | ±5% |
| 25~40 | 0.10 | ±5% |
| 40~60 | 0.15 | ±5% |
| 60~80 | 0.20 | ±5% |
| 80~150 | 0.25 | ±5% |
Location：
