Precision seamless pipe is a pipe material producing by a cold drawn process with high precision and high-quality finish.
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.
Precision seamless pipes may adhere to specific standards depending on their intended use. For example, EN 10305-1 is a European standard that specifies the technical delivery conditions for seamless cold-drawn steel tubes of circular cross-section for precision applications.
Precision seamless pipes offer several advantages, including high dimensional accuracy, smooth surfaces, and the ability to withstand high pressure without leakage. They are also known for their excellent mechanical properties, such as high strength and good formability.
Precision seamless pipes are available from various suppliers and can be purchased online or through specialized steel distributors. They are often offered in a range of sizes and materials to meet specific application requirements.
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.
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:
There are three basic processes employed for the cold drawing of tube:
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.
| Product Name | Standard | Grade | O.D. Size Range 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 |
| Standard | Grade | Chemical Components (%) | |||||||
| C | Si | Mn | P | S | Mo | Cr | V | ||
| ASTM A519 | MT1010 | 0.05-0.15 | / | 0.30-0.60 | ≤0.040 | ≤0.050 | / | / | / |
| MT1015 | 0.10-0.20 | / | 0.30-0.60 | ≤0.040 | ≤0.050 | / | / | / | |
| MT1020 | 0.15-0.25 | / | 0.30-0.60 | ≤0.040 | ≤0.050 | / | / | / | |
| 1010 | ≤0.10 | / | 0.30-0.50 | ≤0.040 | ≤0.050 | / | / | / | |
| 1020 | 0.18-0.23 | / | 0.30-0.60 | ≤0.040 | ≤0.050 | / | / | / | |
| 1035 | 0.32-0.38 | / | 0.60-0.90 | ≤0.040 | ≤0.050 | / | / | / | |
| 1045 | 0.43-0.50 | / | 0.60-0.90 | ≤0.040 | ≤0.050 | / | / | / | |
| 4130 | 0.28-0.33 | 0.15-0.35 | 0.40-0.60 | ≤0.040 | ≤0.040 | 0.15-0.25 | 0.8-1.10 | / | |
| Grade | Delivery Condition |
Tensile Strength (Mpa) Min. |
Yield Strength (Mpa) Min. |
Elongation (%) Min. |
Hardness (HB) Min. |
| 1020 | HR | 345 | 221 | 25 | 55 |
| CW | 483 | 414 | 5 | 75 | |
| SR | 448 | 345 | 10 | 72 | |
| A | 331 | 193 | 30 | 50 | |
| N | 379 | 234 | 22 | 60 | |
| 1035 | HR | 448 | 276 | 20 | 72 |
| CW | 586 | 517 | 5 | 88 | |
| SR | 517 | 448 | 8 | 80 | |
| A | 414 | 228 | 25 | 67 | |
| N | 448 | 276 | 20 | 72 | |
| 1045 | HR | 517 | 310 | 15 | 80 |
| CW | 621 | 552 | 5 | 90 | |
| SR | 552 | 483 | 8 | 85 | |
| A | 448 | 241 | 20 | 72 | |
| N | 517 | 331 | 15 | 80 | |
| 4130 | HR | 621 | 483 | 20 | 89 |
| SR | 724 | 586 | 10 | 95 | |
| A | 517 | 379 | 30 | 81 | |
| N | 621 | 414 | 20 | 89 |
| Standard | Grade | Chemical Components (%) | Mechanical Properties（NBK) | |||||||||
| C Max. |
Si Max. |
Mn | P | S | Mo | Cr | V | Tensile Strength (Mpa) |
Yield Strength (Mpa) |
Elonga-tion (%) |
||
| DIN2391 | ST35 | 0.17 | 0.35 | ≥0.40 | ≤0.025 | ≤0.025 | 0.25-0.35 | / | / | 340-470 | ≥235 | ≥25 |
| ST45 | 0.21 | 0.35 | ≥0.40 | ≤0.025 | ≤0.025 | 0.45-0.65 | / | / | 440-570 | ≥255 | ≥21 | |
| ST52 | 0.22 | 0.55 | ≤1.60 | ≤0.025 | ≤0.025 | 0.90-1.20 | / | / | 490-630 | ≥355 | ≥22 | |
| Standard | Grade | Chemical Components(%) | Mechanical Properties（+N) | |||||||||
| C Max. |
Si Max. |
Mn Max. |
P Max. |
S Max. |
AL Min. |
Cr | V | Tensile Strength (Mpa) |
Yield Strength (Mpa) |
Elonga-tion (%) |
||
| EN10305 | E215 | 0.1 | 0.05 | 0.7 | 0.025 | 0.025 | 0.025 | / | / | 290-430 | ≥215 | ≥25 |
| E235 | 0.17 | 0.35 | 1.2 | 0.025 | 0.025 | / | / | / | 340-480 | ≥235 | ≥21 | |
| E355 | 0.22 | 0.55 | 1.6 | 0.025 | 0.025 | / | / | / | 490-630 | ≥355 | ≥22 | |
| Designation | Symbol | Description | |||||||
| Cold drawn/hard | +C | No heat treatment after the final cold drawing process | |||||||
| Cold drawn/soft | +LC | After the final heat treatment there is a suitable drawing pass | |||||||
| Cold drawn and stress relieved | +SR | After the final cold drawing process there is a stress relief heat treatment in a controlled atmosphere | |||||||
| Annealed | +A | After the final cold drawing process the tubes are annealed in a controlled atmosphere | |||||||
| Normalized | +N | After the final cold drawing operation the tubes are normalized in a controlled atmosphere | |||||||
Precision seamless pipes are typically produced through a cold-drawn or cold-rolled process. This process involves drawing the steel through a die to achieve the desired dimensions and surface finish. The resulting pipes have tight tolerances and excellent surface quality.
Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.
Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.
Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.
The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.
Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.
The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.
