Double wall copper brazed steel tubing, also know as Bundy tube, is the economical alternative to seamless tube. It has many of the samequalities as seamless tubing and is suitable for most high pressureapplications.
High Dimensional Accuracy
Satisfying Mechanical Propertie
Clean Inside Surface
Application
Regular Sizes & Stock
Tolerances
Customized Sizes
Material and Mechanical Performance
Corrossion Protection
Inspection
Manufacture Standard
A -Available as regular stock
U -Stock availability unstable, and needs to be pre-ordered
We are offering Bundy tubes of regular sizes, and at the same time capable of fabricating tubes of customized sizes.
Regular Size & Stock
Bundy tubes of the following table listed sizes are available in stock or to be produced upon being ordered.
| Dimensions | |||
| OD | Wall Thickness | ||
| mm | in. | 0.7mm | 1.0mm |
| 4 | U | ||
| 4.76 | 3/16 | A | |
| 6 | A | ||
| 6.35 | 1/4 | A | |
| 8 | 5/16 | A | U |
| 9.52 | 3/8 | A | U |
| 10 | A | U | |
| 12 | U | U | |
| 12.7 | 1/2 | A | U |
| 15 | U | U | |
Customized Sizes
We are capable of fabricating Bundy tube sizes which are not regularly used. By combinatingone or more processes of cold draw and annealing, Bundy tubes can be made to many other sizes to meet demands for special applications.
Please contact us to discuss in details.
Tolerances
| Tolerances (mm) | |||
| OD | Tolerance | Wall Thickness | Tolerance |
| <4.76 | ±0.05 | 0.7 | ±0.08 |
| 4.76-8 | ±0.08 | 1 | ±0.1 |
| >8 | ±0.15 | ||
Material and Mechanical Performance
| Material | |
| Low carbon steel | |
| Mechanical Properties | |
| Tensil Strength | 42000psi (290MPa) |
| Yield Strength | 26100psi (180MPa) |
| Elongation | ≥25% |
| Expansion | ≥20% |
| Inside SurfaceCleanliness | ≤0.16g/m2 |
