Cold Drawn/Rolled Black Phosphated Hydraulic Steel Tube with High Precision

Short Description:

The high-precision bright seamless steel pipe is used as the phosphating pipe, and the inner and outer walls of the steel pipe are phosphated with high-quality phosphating solution to form a black or gray phosphating protective film.
Absorb antirust oil through the small holes of the phosphating film to prevent rust, and put plastic covers on both ends to prevent dust.

  • FOB Price: US $0.5 - 100 / Piece
  • Min.Order Quantity: 100 Piece/Pieces
  • Supply Ability: 10000 Piece/Pieces per Month
  • Delivery : Within 10 days
  • Quality : Support third-party detection
  • Payment: TT/LC
  • Product Detail


    Product Tags

    Brief Introduction

    The phosphated steel pipe for hydraulic pressure produced according to DIN 2391 or en10305 has a black and bright color, uniform color and good rust prevention function. Phosphated steel pipes are widely used in hydraulic systems, construction machinery and construction vehicles. It is the main export product of our company.

    phosphated steel pipe

    Phosphated hydraulic Seamless Steel Tube Advantages

    • Outside and inside are both phosphated
    • Good surface 
    • Good performance in Anti Rust and corrosion
    • Widely used in Hydraulic Systerm

    Technical Parameters

    Grade                     ST35/E235  ST37.4  ST45/E255 ST52/E355
     Standard DIN2391  DIN1630  EN10305 DIN2445 JIS G3445  SAE J524                              
     Delivery Conditon      NBK(+N)   BK(+C)   GBK(+A)   BKW(+LC)   BKS(+SR)
     SIze OD4 to 219mm Thickness 0.5-35mm, 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.

    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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