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CDS is popular in the hydraulics, being used to make hollowed chrome plated telescopic cylinders and hydraulic rods. It is also popular for large bore, heavy walled, high pressure hydraulic cylinders.
Cold Drawn Seamless tubes also find uses in heavy equipment manufacturing such as cranes and garbage trucks.
Due to the characteristics of high-precision, in precision machinery manufacturing, auto parts, hydraulic cylinders, construction (steel sleeve) industry has a very wide range of applications.
Heat Exchanger Tubes
Heat exchange tubes are intended for heating or cooling process fluids, they are for example suitable for closed circuit cooling of electrical equipment using demineralised water and for cooling water soluble oil solutions in quenching tanks.
Boiler tubes
Boiler tubes are used in heat exchange appliances in which the energy is transferred from one medium to the other.
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Honed tubes
Honed tube is well known as hydraulic cylinder tube in many industries. This is because honed tubes are the most important materials of manufacturing hydraulic cylinders. And as this kind of tubing is usually honed in tube inside diameter, it is known as honed ID tubing also.
General process of cold drawing
A considerable proportion of the seamless tubes and pipes manufactured through the cold roll piercing technology undergo subsequent cold forming. The principal reasons behind cold drawing are:
- Achievement of closer wall thickness and diameter tolerance
- Improvement in surface finish
- To enhance serviceability
- No premature failure
- Suitable for critical forming Such as 180˚ Bends
- Enhancement of mechanical properties of the tube
- Expansion of product mix towards the lower end of the OD and wall thickness scales.
There are three basic processes employed for the cold drawing of tube:
- Hollow drawing
- Stationery drawing or floating plug drawing and
- Drawing over a mandrel (also known as drawing on-the-bar)
Annealing
After the goods are cold drawn to sizes, the tubes are put on annealing furnace for heat treatment and normalising.
Straightening
Post annealing, the goods are passed through a seven roller straightening machine to achieve proper straightening of the tubes.
Eddy current
Post straightening, each tube is passed through eddy current machine to detect for surface cracks and other defects . Only the tubes that pass eddy current are fit for delivery to customers.
Finishing
Each tube is either oiled with corrosion resistant oil or varnished for surface protection and corrosion resistant as per customers requirement, each tube end is covered by plastic end caps to avoid damage in transit, the marking and specs are put and the goods are ready for dispatch.
Precision cold drawn shapes mean the product that has complicating geometry manugactured by drawing process under temperature.
| Product Name | Standard | Grade | Size Range (O.D. mm) | Usage |
|---|---|---|---|---|
| Seamless cold drawn precision tubes | JIS G3445 | STKM 11A, STKM 12A, STKM 12B, STKM 12C, STKM 13A, STKM 13B, STKM 13C, STKM 15A, STKM 15C, STKM 17A, STKM 17C, STKM 18A | 6.00 to 88.90 | Mechanical and Automobile Precision Tubes |
| DIN2391 | ST35, ST45, ST52 | 6.00 to 76.00 | Seamless precision tubes | |
| ASME/ ASTM SA/A519 | SAE1010, SAE1020, SAE1025, SAE1026, SAE1035, SAE1045, SAE4130 | 6.00 to 340.00 | Mechanical precision tubes | |
| EN10305-1 | E215, E235, E335 | 6.00 to 340.00 | Hydraulic pressure equipment | |
| ISO8535-1 | ST35, ST37, ST52 | 6.00 to 16.00 | High precision high pressure fuel pipes | |
| Cold Drawn Welded Precision Tubes | ASTM A513 | MT1010, 1015, 1020 | 21.70 to 90.00 | Automobile shock absorber cylinder, front and rear axle structural purpose, director tubes, engine hydraulic tubes |
| EN10305-2 | E215, E235, E335 | 10.00 to 90.00 | ||
| DIN2393 | S215, S235, S355 | 10.00 to 90.00 | ||
| DIN2394 | S215, S235, S355 | 10.00 to 90.00 |
What is a Precision Seamless Tube?
Precision seamless pipe is a kind of high-precision steel pipe material processed by cold drawing or hot rolling. Because the inner and outer walls of precision steel pipe have no oxide layer, bear high pressure and no leakage, high precision, high smoothness, cold bending without deformation, expansion It is mainly used to produce pneumatic or hydraulic components, such as air cylinders or oil cylinders, which can be seamless pipes or welded pipes. The chemical composition of precision steel pipes is carbon C, silicon Si, manganese Mn. , Sulfur, Phosphorus P, Chromium Cr. Compared with solid steel such as round steel, seamless steel pipe is lighter in bending and torsion strength when the bending and torsion strength is the same. Components.
Classification of precision seamless tubes
Precision seamless tubes, precision hydraulic seamless tubes, cold drawn precision seamless tubes, cold rolled precision seamless tubes, high precision seamless tubes, precision bright seamless tubes.
The main varieties of precision seamless tubes:
DIN/EN series high-precision precision bright seamless steel pipes, special steel pipes for hydraulic systems, special steel pipes for automobile manufacturing.
Features and advantages of precision seamless tubes:
1. The precision is high, which saves the user’s waste of labor and materials for machining.
2. There are many specifications and a wide range of applications.
3. The cold-rolled product has high precision, good surface quality and good straightness.
4. The inner diameter of the steel pipe can be made into a hexagonal shape.
5. The performance of the steel pipe is superior, and the metal is denser.
While inheriting the advantages of seamless steel pipes, precision steel pipes also have some of their own characteristics. The use of precision manufacturing of ring parts can increase the utilization rate of materials, simplify the manufacturing process, and save materials and processing man-hours. For example, rolling bearing rings, jack sleeves, etc., have been widely manufactured with precision steel pipes. The popularization and application of precision seamless pipes is of great significance for saving steel, improving processing efficiency, reducing processing procedures or equipment investment. It can save costs and processing man-hours, increase production volume and material utilization, and help improve product quality and reduce costs. , Is of great significance to improve economic efficiency. Generally, precision seamless tubes are used in industries with high precision requirements, and most of them without precision requirements use seamless tubes. After all, the price of precision seamless tubes of the same specifications is higher than seamless tubes.