Hot finish seamless tubing is employed in a variety of uses, particularly when heavy wall thicknesses, specific steel alloys or both are required. Specific applications include bushings, spacers, bearings and other mechanical parts in automobiles, trucks, aircraft and construction, agricultural and drilling equipment, as well as hydraulic cylinders.
Features
- Ability to provide thicker walls than other tube manufacturing methods
- Exhibits high strength mechanical properties
- Used for high pressure and heavy-duty applications that require strength, but less stringent dimensional tolerances
Benefits
- Uniform structure reduces machining time and expense
- Cost effective heavy wall tubing
- Wide range of sizes
Size capability may vary by specification and facility. Please inquire for more specific information.
Grades
- Carbon base grades 1008 – 1050
- Alloy full range of 41xx/43xx & 86xx series
- Others available by inquiry
Specifications
- ASTM A519
- Customer specific available by inquiry & review
Manufacturing process
Tubular Products’ seamless mechanical tubing is produced from solid round billets by rotary piercing and then is rolled in an Assel mill equipped with a no-end-loss unit that permits an extremely broad range of diameter/wall thickness ratios. Tubes are then processed through a multiple-pass sizing reducing mill and a rotary sizer.
Tube lengths from the hot mill are slowly air cooled or—moved directly to a unique isothermal annealing furnace to ensure a uniform microstructure hardness to promote excellent machinability. This process contrasts with conventional slow-cool furnaces, where tubes are cooled in bundles. That can result in variations in microstructure and hardness from tube to tube and even within a tube itself.
After cooling, tubes are pickled in an acid bath to remove mill scale and are inspected. Minor imperfections are removed by grinding prior any additional processing.