Welded Steel Tube Precision Cold Drawn Automotive Steel Tube, is manufactured through a precise cold drawing process followed by welding. This type of steel tube is widely used in the automotive industry due to its high strength, precision, and consistent wall thickness. The tube's excellent durability and mechanical properties make it ideal for various applications in automobiles, including chassis, suspension systems, and fuel lines.
| Technique | Cold drawn & cold rolled |
| Application | 1. Automotive and mechanical pipes |
| 2. Petroleum cracking pipes |
| 3. High Pressure Boiler Pipe |
| 4. Low and middle pressure fluid transportation pipeline |
| 5. Chemical fertilizer equipment pipes |
| 6. Heat exchanger pipes |
| Delivery Conditions | 1. BK (+C) | No heat treatment after last cold forming process. |
| 2. BKW (+LC) | After last heat treatment there is a light finishing pass (cold drawing) |
| 3. BKS (+SR) | After the final cold forming process the tubes are stress relieve annealed. |
| 4. GBK (+A) | After the final cold forming process the tubes are annealed in a controlled atmosphere. |
| 5. NBK (+N) | After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere. |
| Package | 1. Bundle Packing. |
| 2. Plain end or vanished as per customer's request. |
| 3. Wrapped in waterproof paper. |
| 4. Sackcloth with several steel strips. |
| 5. Pack in heavy tri-wall boxes. |
Certificates: according to EN 10204 3.1
Inspection Items: Tensile stength, Yield stength, Elongation, Flattenging, Flaring
Chemical analysis
Eddy Current Test 100%, Size and surface checking 100%
Other test item can be arranged as per request
The tubes can be produced in the following delivery conditions:
BK (+C) Cold finished/hard (cold finished as drawn).
No heat treatment after the last cold forming process.
BKW (+LC) Cold finished/soft (lightly cold worked)
After the last heat treatment there is a light finishing pass (cold drawing).
BKS (+SR) Cold finished/stress relieve annealed.
After the final cold forming process the tubes are stress relieve annealed.
