EN10139 DC04 7.94MM*0.9MM Double-wall zinc-coated Seamless steel tubing in coil
We supply steel tubes of many sizes with fine accuracies, made from low carbon steel strips.
Zinc galvanized double-wall steel tube has better corrosion protection than non-galvanized double-wall steel tube which is copper brazed
Bundy tube, sometimes called Bundy pipe, is the type of double-walled low-carbon steel tube manufactured by rolling a copper-coated steel strip through 720 degrees and resistance brazing the overlapped seam in a process called Bundywelding.
We offer single wall electro-welded steel tube, also known as single wall Bundy tube. Mostly it's coated with copper for automotive use. Also, it can be plated with zinc for automotive and condenser use, or coated with PVF for automotive use, as an economic alternative for double-wall welded steel tube.
Chemical Composition
| Chemical Composition |
| C | Si | Mn | P | S |
| 0.08% | 0.03% | 0.03% | 0.02% | 0.02% |
Mechanical Properties
| Tensile Strength | 290Mpa |
| Yield Strength | 180Mpa |
| Elongation | 20% |
| Salt spray test | 48hours |
| Inside Surface Cleanliness | 20g/m2 |
SINGLE WALL STEEL TUBING OD & WT TOLERANCE
All the tube diameters can be available plain, zinc-coated or copper coated.
PLAIN TUBE
Plain tube is supplied with its outside surface slightly oiled to improve the resistance to oxidation. Tube shall be kept in dry storages, away from air drafts, humidity or any other corrosive agents
ELECTROLYTIC BOTH SIDE COPPER COATING
The steel strip from which the tube is made shall be copper coated on both sides with a copper layer ≥2µm. The area along the welding seam, on the outside surface is not coated because of the scarfing operation to remove the excessive bead.
HOT DIP ZINC COATING
Tube outside surface can be coated with a layer of zinc whose weight is ≥ 70 grams per square meter determined by UNI EN ISO 1460/97. This coating the tube withstands to > 72 h in salt spray fog test before showing red rust (according to UNI ISO 9227).
WORKING SHOP
Laboratory Testing Equipment
PACKING
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EN10139 DC04 Double Wall Steel Tube 7.94MM*0.9MM Zinc Galvanised Steel Pipe Coil Images
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