Products / Products

Companies / About Us

We can also provide / About Us

Contact us

ADD: Building B,Gaoqiao Industries Park,Chengdong Road,Jingang Town,Zhangjiagang city.
Post: 215631
Tel:   +86-512-56930188;
Fax: +86-512-56930805
Tel: +86-512-56720298;
Fax: +86-512-56720295
Tel: +86-512-56729085;
Fax: +86-512-56720295

The current position: Home -

  • Name: DIN-precision fine drawing bright precision seamless
  • Number: A001
  • Time: 2014-11-18
  • Views : 395
  • Sold amount: 0Piece

Light pipe


· Outer diameter: 4-60mm, wall thickness: 0.5-60mm

· Standard: DIN2391 / EN10305-1 / 4, SAEJ524 / JISG3445

· Material: ST35, ST37.4, ST37, ST45, ST52, ST52.4, E235, E255, E355, SAE1010, SAE1020

· Delivery status: NBK (bright anaerobic normalizing)

· Length: 5800mm, 6000mm.

Packing: wooden packing or packaging.

Surface rust treatment: the inner and outer surfaces of the tube flush with anti-rust oil.

Surface quality: high accuracy, good finish, no oxide layer, no cracks, folding, rolling, folding, scarring, separation, hairline, and other defects. Surface finish: clean and free of iron, clean, better to extend the service life of the hydraulic system.

· Mechanical properties: a better elongation and strength properties after cold deformation, the flattening and flaring after no cracks.

· Test: tensile test, flaring and flattening test, hardness test, the chemical composition of the test.


Production Process Description: high quality steel tube embryo - precision cold drawn - anaerobic heat treatment (NBK state) - NDT - High Pressure Oil Test - surface rust oil treatment - the dust seal two.

We select raw materials: high quality Baosteel, Xingcheng Special Steel, Huaigang raw materials. Physical and chemical performance testing to ensure within acceptable ranges for each consignment. After detecting internal perforation, each pipe size are permitted deviation range. This ensures a higher wall thickness tolerances and concentricity.

Production process quality control: We used to pull the domestic first-class machines, the production process through the inner and outer superhard mold control, so the product's dimensional tolerances and ovality tolerance control at a high level. By the first, middle and end of the inspection to ensure product quality.

Inner and outer surface cleanliness: We use the automatic washing machine cleaning the hole, rotary brush cleaning and high pressure oil and wash the outer surface of the inner hole. This new steel production process can effectively remove all the particles adhering to the hole and the surface of the steel pipe, the inner and outer surfaces of the steel pipe was very clean and bright effect.

Anti-rust oil coating the finished tube:

We use high-pressure spraying method, a precipitation with high pressure spray gun, ensure that the inner and outer surfaces of the steel pipe clean and bright.

Main purpose:

Precision tubes for hydraulic systems, automobiles, machinery, and other precision steel pipe, finish, cleanliness, there are areas of high mechanical performance requirements.


DIN2391 steel Dimensions: diameter range: 4-60MM, wall thickness tolerance: 0.5-7MM, precision tubes delivery status in accordance with EN 10305-1, DIN 2391, BS 6323/4, ASTM A519 and JIS G3445 standard.

Pipe tolerance table


  Range (mm)
  GB (mm)
  German standard (mm)
  Corporate internal control standards (mm)
  Special high-precision (mm)
Outside diameter
  ± 0.1
  ± 0.08
  ± 0.05
  ± 0.03
  ± 0.15
  ± 0.15
  ± 0.05
  ± 0.03
  ± 0.20
  ± 0.20
  ± 0.08
  ± 0.03
  ± 0.25
  ± 0.25
  ± 0.08
  ± 0.03
Wall thickness
  ± 10%, Min ± 0.12
  ± 10%
  ± 10%, Min ± 0.05
  ± 10%, Min ± 0.03



DIN2391 standard steel pipe steel grades


  E215, E235, E255, E355, C45E, 30GrMo
  ST35, ST45, ST52, ST37.4
  ST37.4, ST44.4, ST52.4
BS6323 / 4
  CFS3, CFS4, CFS5, CFS8
  SAE1010, SAE1020, SAE1045

DIN2391 standard steel and heat treatment process delivery status


Delivery Status
  Heat Treatment Program
+ C
  Cold drawn / hard. After the final cold forming no heat treatment.
+ LC
  Cold drawn / soft. After the final heat treatment limiting deformation cold drawn, allowing a degree of cold deformation
+ SR
  Steel heat treatment is applied after the last cold deformation process, the result of state steel after due process, the residual stress deformation and machining makes a certain degree of difficulty increases.
+ A
  In the final step of the steel pipe after cold deformation, placed in a controlled atmosphere furnace for annealing.
+ N
  In the final step of the steel pipe after cold deformation, placed in a controlled atmosphere furnace at a temperature above the phase transition point to continue annealing.

DIN2391 precision steel standard length.

Precision tube length of any length: 3-10 m

Length tolerance is +/- 10mm

Automotive industry pipe length can be cut according to customer requirements.


DIN2391 precision steel surface protection:

Pipes for corrosion applications. An inner surface and an outer surface with a high pressure flushing.

DIN2391 precision tube test:

Precision steel mandatory experimental chemical analysis, tensile testing, dimensional inspection and surface inspection.

Specify test: acceptance test criteria 3.1.B (3.1.A, 3.1.C).
Limited test: flattening test, flaring test, roughness and non-destructive testing to detect longitudinal defects: turbine inspection test, in accordance with EN10246-1 standard eddy current testing to prove leak test.

Precision steel warranty book:

Accordance with the standards issued by the warranty book, for example, we will show: EN10204 (-2.2 infinite qualitative test, qualified testing 3.1.B or 3.1.A, 3.1.C)

Competitive Advantage:

We obtained a certificate: TS 16949

2 Our main customers: ContiTech, Benteler.

3 We used BMW's factory inspection.

4 We cooperate with many auto parts factory, our pipes are widely used in BMW, Volkswagen and other car brands.

5 We have 400 tons inventory, thus ensuring our delivery in a short time.

Product Comparison