JIS Stkm13c, DIN St52, SAE1020 Srb (Skived & Roller Burnished) Pneumatic Cylinder Tube

• Type: Seamless
• Technique: Srb
• Material: Alloy, Carbon Steel
• Surface Treatment: Bare Pipe
• Usage: Boiler Pipe, Hydraulic/Automobile Pipe, Machinery Industry, Chemical Industry, Special Purpose
• Section Shape: Round
• Inner Diameter: 30mm~416mm
• Precision of Inner Size: H5~H10
• Roughness of Inner Surface: Ra≤0.63um
• Length: Fixed Length, by Random
• End Processing: Plain Ends
• Steel Material: St52, Q345b, 27simn, 15CrMo,40cr, 20cr,etc
• Transport Package: Standard Seaworthy Packing
• Specification: ASTM, DIN, GB/T
• Trademark: Iron&steel
• Origin: China
• HS Code: 73045910
• Production Capacity: 2000tons Per Month

Product Description

The honing/skived and roller burnished seamless steel pipe is cold draw both inside and out, then is given tempering treatment with a tensile strength of up to 520N / mm2 or more. Our factory improves upon the work with our own precision honing/skived roller burnished, using the diameter tolerance of H5~H10. It helps to extend the life of the cylinder, and reduces the wear of the seal.

Specifications of major steel material:

Processing form	I.D.mm	Length	Straightness	I.D.tolerance	I.D.Roughness(RA)
Cold-rolled	30-100	≤12M	0.3-1.0/1000	H8-H10	0.4-1.6um
Cold-drawn	30-250	≤12M		H8-H10	0.8-1.6um
Hone	40-500	≤12M		H8-H9	0.4-0.8um
SRB	50-250	≤9M		H8	0.1-0.4um

 Tolerance of ID and WT 

Size of inside Diameter(mm)	ID Tolerance			Tolerance of wall thickness
30	+0.0330	+0.0520	+0.0840	<120mm(OD)              ±5% >120mm up 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	+0.1850
>250-315	+0.0810	+0.1300	+0.2100
>315-400	+0.0890	+0.1400	+0.2300

Length and cut tolerance
Length ≤ 500mm , +2mm
> 500mm ≤ 2000mm, +3mm
> 2000mm ≤ 5000mm, +5mm
> 2000mm ≤ 7000mm, +10mm
Standard:DIN 2391,EN10305
Material: St45,St52,E355
Chemical composition 

Steel grade	Chemical composition,%
	C	Si	Mn	P	S	Cr
				≤
St45	0.17-0.24	0.17-0.37	0.35-0.65	0.035	0.035	0.250
ST52(E355)	≤0.22	≤0.55	≤1.6	0.025	0.025	0.25
SAE1026	0.22-0.28	0.15-0.35	0.60-0.90	0.040	0.050	/
27SiMn	0.24-0.32	1.10-1.40	1.10-1.40	0.035	0.035	0.300
20#	0.17-0.24	0.17-0.37	0.35-0.65	0.035	0.035	0.250

9. Mechanical Properties 

Delivery condition	BK Cold finished(hard)		BKS Cold drawn and stress-relieved
Steel grade	Rm Mpa	Elongation A5(%)	Rm MPa	ReH MPa	Elonggation A5(%)
ST45	≥550	≥5	≥520	≥375	≥15
ST52(E355)	≥640	≥5	≥600	≥520	≥14
SAE1026	≥640	≥5	≥600	≥510	≥15
16Mn	≥640	≥5	≥600	≥520	≥14
20#	≥550	≥8	≥520	≥375	≥15

Tube ends 
Tube ends shall be cut nominally square to the axis and free from burs 
11.Delivery condition:BKS
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