Specifications

1 ID30-250mm W.T.2-30mm
2.Straightness: 0.5 /1000
3.Tolerance INT: ISO H9 H8 H7
Hot selling china seamless pipe ASTm AISI Di

Hot selling  china seamless pipe ASTm AISI DiN standard

1.Straightness: 0.5 /1000
2.Tolerance INT: ISO H9 H8 H7

Specification of cold tube:

Inside diameter	40-250mm
Max length	14m
Straightness	0.5 /1000
Tolerance INT	ISO H9 H8 H7
Type	cold drawing
Tubes are provided according to the norm EN10305-1

 CHEMICAL COMPOSITION (%)

Si(Max)	Mn(Max)	C(Max)	P (Max.)	S(Max)
0.50	1.6	0.22	0.025	0.025

 

MECHANICAL PROPERTIES

Tensile strength Min	Yield Point Min	Elongation % Min
580N/mm2	420N/mm2	10

 

EXCENTRICITY

Outer Diameter	Excentricity
< =125 mm	5 %
> 125 mm	7 %

measured according to the formula:

E = (max Wt – min Wt)/( max Wt + min Wt) x 100 %

 

BORE OVALITY

The bore ovality is comprised in the 50 % of the inside diameter tolerances. ready to honed tube

Marking: JW, ID, OD

Length: unfixed length or fixed length

Package: banding with steel strips, braiding parcel at outside

Conservation: Anti rust oiled coating on the inside and outside of the surface, plastic caps at both ends.

Impact test: -20°C, 27 J (only for special requirement)

 Process

• Pretreatment :  Acid cleaning- Parkerizing

 

• Cold drawn/cold rolled

• Annealing furnace—— stress-relieving (+SR)

 

• Straightener—— Straightening/ Leveling

•  Straightness inspecting

• Dimension inspecting

  

• Sawing off not good parts

 

• Lathe

• Surface Polishing

 Finished honed tube

Application: Hydraulic cylinder tube

Any need, please feel free to contact us!

ISO 9001 2008 Verified High standard