Specifications

4140 honed steel tubing
1.ID30-250mm
2.Technology:Cold Drawn
3.Better Roughness
4.No MOQ

4140 honed steel piping

Yantai Xinpeng Steel Is professional supplier on hydraulic cylinder tubes,bored tubes, Honed tubes, Cold drawn tubes.Seamless steel tubes, Cold drawn weld tubes!

Specification:

Product name:  Professional Supplier hydraulic cylinder Honed tube

1. MATERIAL SPECIFICATION AND REF. DOCUMENT

                       ST52,BK+S,DIN2391 OR Equivalent

2. CHEMICAL COMPOSITION (%)

Grade Elements	C(max)	Si(max)	Mn	P	S(max)
ST35	0.17	0.35	≥0.40	0.025	0.025
ST42	0.21	0.35	≥0.40	0.025	0.025
ST52	0.22	0.55	≤1.60	0.025	0.025

3. MECHANICAL PROPERTIES

Elongation(Min)    Y.S (Min.)         UTS (Min.)

≥15                     470 N/MM2       580 N/MM2

4. SUPPLY CONDITION

Cold drawn seamless steel tube, stress relieved and honed or skived roller burnished

5. SURFACE ROUGHNESS

Ra = 0.4~0.8Micron

6. TOLERANCES ON INNER DIA

ISO H8 H9

7. STRAIGHTNESS

≤ 0.5 mm/M

8. ID TOLERANCE

SIZE of I.D	I.D.Tolerance			Tolerance of wall thickness
	H8	H9	H10
30	+0.0330	+0.0520	+0.0840	<120mm(O.D) ±5% ≥120mm(D.D) to 210mm ±7.5% >210mm                        ±10%
>30-50	+0.0390	+0.0620	+0.1000
>50-80	+0.0460	+0.0740	+0.1200
>80-120	+0.0540	+0.0870	+0.1400
>120-180	+0.0630	+0.1000	+0.1600
>180-250	+0.0720	+0.1150	+0.185
>250-315	+0.0810	+0.1300	+0.2100
>315-400	+0.0890	+0.1400	+0.2300

 

 9. LENGTH AND CUT TOLERANCE

 Length ≤ 500mm , +2mm

500mm <Length ≤ 2000mm, +3mm

2000mm <Length≤ 5000mm, +5mm

5000mm < Length≤ 7000mm, +10mm

10. TUBE ENDS

Tube ends shall be cut nominally square to the axis and free from burs

11. APPEARANCE

Tube shall have a smooth internal and external surface consistent with cold working

process, tube inner surface should be free from rust, scratches and other surface

irregularities.

12. CERTIFICATION

Material certificates will be send.

13. PACKING

Anti-rust oil to be applied on material. Ends closed by plastic cap .  Bundled by steel  strips,braiding parcel.

14. SCOPE

Hydraulic cylinder tube for swivel crane, injection machine and construction

15.Production Process:

• Pretreatment : Pickling­—Phosphating—Saponification

 

 

 

• Cold drawn/cold rolled

 

 

• Annealing furnace——+SR

 

 

• Straightener—— Straightening

 

 

•  Straightness inspecting

 

 

• Dimension inspecting

 

  

 

• Sawing

 

 

 

• Lathe

 

 

• Polishing

 

 

• Products inspecting

 

 

• Finished Products

 

 

  Xinpeng Have passed The ISO9001 2008