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Sheng Ding Yuan Pipe-Making Co., Ltd
Sheng Ding Yuan Pipe-Making Co., Ltd  

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Carbon Seamless Steel Tube 

Payment Terms: T/T,L/C 
Place of Origin: Jiangsu, China (Mainland) 
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Product Detail

Means of Transport: Ocean,Land,Air
Packing: covered with caps at two en...
Production Capacity: 650 tons per month
Delivery Date: within 40 days

Material: ST 35,ST 37.4 E 235 E 355 ST 52.4 Standard: DIN 2391 EN 10305-1 DIN 1630 SAE J524
Application: Hydraulic System, Automobile, Mechanical Par

Detailed Product Description

Material:E215, E235, E255, E355,C45E, 30GrMoStandard:EN10305-1
Application:Hydraulic System, Automobile, Mechanical PartsOuter Diameter:4 To 60mm
Technique:Precision Cold Drawn Seamless Carbon Steel TubeThickness:0.5 To 7mm

Precision Cold Drawing Seamless Carbon Steel Tube For Automobile

Quick Detail:

1.DIN2391 st 52 steel tube are made using the cold drawing process. Precision tubes are made from carbon steel from quality Bao Steel,XingCheng Steel,and HuaiSteel.

2. The tubes are high precision in tolerance,excellent surface brightness,no oxidization on the outer and inner walls after heat treatment,high cleanness of inside wall.

3. No deformation after cold bending,no crack after flaring and flattening.


Synopsis of Process Routing: Quality Carbon steel — Cold Drawn — Heat Treatment Without Oxidization (NBK Status) — Nondestructive Testing— Flushing The Internal Hole With Special Equipment Under The High Pressure —Dealing With Antirust Oil On Surface — Plastic Capping On Both Ends.

The raw material we choosing:high quality Bao Steel,XingCheng Steel and HuaiSteel.Physical and chemical inspection will be made to make sure each batch is in qualified range. After piecing,each piece of tube is checked to be in permitted size deviation,this can garantee higher thickness tolerance and concentricity.

Production process quality control: We use the domestic first-class drawing machine,the production process is controlled with high hardness alloy internal and external matrix,so the product dimensions tolerance and ovality are strictly controlled in high level.Through the first, middle and last process inspection to ensure product quality.

Inner and Outer Surface Cleaning: We adopt automatic inner surface cleaning machine, rotating brush cleaning and high pressure oil flushing to clean the inner and outer surface.The new steel tube production craftsmanship can effectively remove all particulate attached to the inner and outer surface of tubes and thus achieving the utmost surface cleaness and polishness.

Finished tube anti-rust oil plating: We adopt high pressure spray plating method, the antirust oil is plated by high pressure jet after ten passes of filtering and one pass of precipitation to safeguard the tubes' outer and inner surface cleaness and polishness.


Precision tubes are used in hydraulic system,automobile,mechanical parts and in the occasion where the high precision,brightness,cleanness and mechanical properties of the tube are required.


Tube dimensions for carbon Precision steel tube

Outside diameter ranges from 4 to 60 mm and wall thickness ranges from 0.5 to 7mm. Precision steel tubes are delivered according to EN 10305-1, DIN 2391, BS 6323/4,ASTM A519 and JIS G3445.

Tolerance Table Of Steel Tube




GB (mm)

DIN (mm)

Enterprise control(mm)

Special high-precision(mm)

OD              Out Diameter





















Wall thickness 






Steel grades for carbon Precision steel tube





E215, E235, E255, E355,C45E, 30GrMo


ST35, ST45, ST52, ST37.4









Delivery condition and heat treatment processing of carbon Precision steel tube


Delivery Condition

Heat treatment process


Cold drawn/hard.After the last cold forming,no heat treatment.


Cold drawn/soft.After the last heat treatment follows the cold drawing there is a light finishing pass.



Cold drawn and stress relieved annealed. After the final cold drawing process the tubes are stress relieved annealed in a controlled atmosphere.


After the final cold drawing process the tubes are stress relieved annealed in a controlled atmosphere.


Normalized. After the last cold drawing process the tubes are annealed in a controlled atmosphere.


Length of precision tubes for carbon Precision steel tube

random length precision tubes in the range of 3 – 10 m

approximate length with tolerance +/-10 mm

tubes for the automotive industry also can be delivered as cut tubes according to customers' requirment.


Marking and bundles of carbon Precision steel tube

Marking of standard precision tubes is done according to standards or upon agreement by the InkJet system either in one spot or along the whole length of a tube. Bundle marking is done either by one or multiple labels with required data.


Surface protection of precision tubes for carbon Precision steel tube

Tubes are supplied with anticorrosion application. Internal surface and external surface are flushed with antirust oil.


Testing of precision tubes for carbon Precision steel tube

The mandatory tests for standard precision tubes are chemical analysis, tensile test, dimensional inspection and visual inspection.
Specific testing – acceptance testing certificate 3.1.B (3.1.A, 3.1.C).
Elective testing: flattening test or drift expanding test, roughness measurement and NDT to find longitudinal defects: eddy current inspection test,as a proof of tightness or leakage test by eddy current EN 10246-1.


Certificates for precision tubes

Certificates are issued according to standards, as an example we are showing: EN 10 204 (non-specified testing – 2.2, specified testing 3.1.B or 3.1.A, 3.1.C).

Competitive Advantage:

Certificate we awarded:TS 16949

  • Our typical customer: Continential Contitech,Benteler.

  • We have passed BMW'S review.

  • We have been cooperating with many auto parts manufacture,our tubes are widely used in BMW,Volkswagen,and other brands.

  • 400 tons precision steel tubes stock capacity,this make our delivery time short and timely.

 Ms. kris zheng

Tel: 86-512-56720298
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Company Info

Sheng Ding Yuan Pipe-Making Co., Ltd [China (Mainland)]

Business Type:Manufacturer
City: Suzhou
Province/State: Jiangsu
Country/Region: China (Mainland)

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