Anaerobic brightening Seamless Precision Steel Tube

Short Description:

Anaerobic brightening Seamless Precision Steel Tube for Bending and Flaring Adopt high-quality carbon steel, finish drawing or rolling process, and anaerobic bright heat treatment. Each steel pipe is subject to nondestructive testing. The inner wall of the steel pipe is washed under high pressure and immersed in antirust oil, which can withstand greater pressure. Both ends are equipped with dust.

Anaerobic brightening Seamless Precision Steel Tube pressure tubing intended for use as hydraulic lines and in other applications requiring tubing of a quality suitable for flaring and bending.
The seamless steel tube Straigtness: tube shall be straightened to atolerance of 1mm over a 1000mm lenght.

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Brief Introduction

EN/DIN cold drawn seamless steel tube wiht high precsion adopt anaerobic  bright heat treatment(NBK) or (GBK) to get the bright surface of the steel tube. The tube could be bending,flaring and flattening wihout crack. It has high precison, on oxide layer on both sides of the tube. It can be used for various complex deformation and machining. BA high precison seamless steel tube is usually used for hydraulic cylinder, diesel,hydraulic pump station and hydraulic system which ares require the steel tube in high precison and cleanliness

bright seamless steel pipe

Technical Parameters

Grade  ST35/E235  ST37.4  ST45/E255 ST52/E355
 Standard  SAE J524 SAE409  DIN2391  DIN1630  EN10305 DIN2445 JIS G3445 
 Delivery Conditon  NBK(+N)   BK(+C)   GBK(+A)   BKW(+LC)   BKS(+SR)
 Size OD4 to 120mm Thickness 0.5-20mm, Length: Accroding to request
 Tolerance Outer Diameter:   According to Standard
Thickness:           According to Standard
 Finish Phosphated Coating
Oil dipped
 Application Hydraulic System;Car/bus;construction vehicle
 Delivery time A.7 days if this goods is stock goods.
B.20 days if this goods will be produced after order

Delivery Condition 

Designation Symbol Description
Cold finished (hard) BK(+C) Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation
Cold finished (Soft) BKW
The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding)
Cold finished and stress-relieved BKS(+SR) Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree.
Annealed GBK(+A) The last Cold forming process is followed by annealing in a controlled atmosphere.
Normalized NBK(+N) The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.


Outer Diameter Allowable tolerance Special Tolerance
GB/T3639 DIN2391 OD WT
4mm-20mm ±0.10mm ±0.08mm ±0.05mm ±0.05mm
20mm-30mm ±0.10mm ±0.08mm ±0.08mm ±0.08mm
31mm-40mm ±0.15mm ±0.15mm ±0.10mm ±0.08mm
41mm-60mm ±0.20mm ±0.20mm ±0.15mm ±0.15mm
61mm-80mm ±0.30mm ±0.30mm ±0.20mm ±0.20mm
81mm-120mm ±0.45mm ±0.45mm ±0.30mm ±0.30mm

Certificates:       According to EN 10204 3.1 

Inspection Items:
Tensile stength, Yield stength, Elongation, Flattenging, Flaring;
Chemical analysis
Eddy Current Test 100%, Size and surface checking 100%
Other test item can be arranged by A Third Party as per request

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