Precision Seamless Pipe

Precision Seamless Pipe

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.

Standards

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.

Advantages

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.

Availability

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.

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:

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.

precion seamless pipe
precion seamless pipe
precion seamless pipe

Available grades and size range

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

Chemical Components of ASTM A519 (ASME SA519)

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 /

ASTM A519 (ASME SA519) ASTM A513 Mechanical Properties ( Normal Grade)

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

DIN2391

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

EN1030-1, EN10305-2, EN10305-3

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

Cold Drawn Precision Tube Delivery Condition

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.

【H】 Ceramic lined pipe

Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.

【H】 Cast basalt lined steel pipe

Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.

【H】 Ceramic Tile Lined Pipes

Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.

【H】 Rare earth alloy wear-resistant pipe

The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.

【H】 Tubes Erosion Shields

Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.

【H】 ASTM A213 T91 Alloy Tube

The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.