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Skived and Roller Burnished Tubes

Skived and roller burnished tubes represent a pinnacle in the production of high-precision, seamless hydraulic cylinders. This two-stage cold-working process transforms a rough, honed, or extruded steel tube into a component with exceptional surface characteristics and dimensional accuracy, making it ideal for demanding hydraulic and pneumatic applications.

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Description

The process begins with skiving. In this first stage, a single-point cutting tool is passed through the bore of the tube. Its primary function is to remove a controlled layer of material from the internal surface. This achieves two critical objectives: it eliminates surface imperfections and inconsistencies from the base material, and it establishes the exact final inner diameter with extremely tight dimensional tolerances. Skiving effectively prepares a perfectly uniform canvas for the next crucial step.

The second stage is roller burnishing. This is a chipless finishing process where hardened, precision rollers are forced under high pressure against the skived inner surface. The rollers cold-work the metal, compressing the peaks of the microscopic surface profile into the valleys. This plastic deformation yields a multitude of benefits:

Superior Surface Finish

It creates an exceptionally smooth, mirror-like surface with a very low roughness average (Ra). This minimizes friction, reduces wear on seals and pistons, and enhances the efficiency of the hydraulic system.

Increased Hardness and Strength

The cold-working process induces compressive stresses on the surface layer, which increases its hardness and fatigue strength, leading to a longer service life.

Improved Pressure Retention

The burnished surface is non-porous and densified, providing an excellent barrier against fluid leakage.

The combination of these processes results in a tube that offers unmatched performance. The skiving ensures perfect geometry and size, while the roller burnishing optimizes the surface integrity. Consequently, these tubes are the preferred choice for hydraulic cylinders in heavy machinery, industrial equipment, and mobile applications where reliability, efficiency, and longevity are paramount. Their seamless nature and superb finish contribute to lower operating costs through reduced friction, minimized leakage, and decreased downtime.

1. Chemical Composition

Steel grade	Chemical composition %
	C	Si	Mn	P	S	Cr	Ni	V	AI
	C	Si	Mn	≤				≥
C20	0.17-0.24	0.17-0.37	0.15-0.65	0.035	0.025	0.250	0.250	/	/
CK45	0.42-0.5	0.17-0.37	0.5-0.8	0.025	0.025	0.250	0.300	/	/
Q355B	≤0.2	≤0.5	1.0-1.6	0.030	0.030	0.030	0.250	0.080	0.015
Q355D	≤0.2	≤0.5	1.0-1.6	0.030	0.025	0.250	0.250	0.150	/
E355(ST52)	≤0.22	≤0.55	≤1.6	0.025	0.025	0.250	0.250	/	/
SAE1026	0.22-0.28	0.15-0.35	0.6-0.9	0.040	0.050	/	/	/	/
4130	0.28-0.33	0.15-0.35	0.4-0.6	0.040	0.040	0.80-1.10	/	/	/
4140	0.36-0.43	0.15-0.35	0.705-1.0	0.040	0.040	0.80-1.10	/	/	/

2.Mechanical Property:

Delivery condition	Cold finished(hard)(BK)		Cold drawn and stress-relieved(BK+S)
Steel grade	Rm MPa	Elongation A5%	Rm MPa	ReH Mpa	Elongation A5%
C20	≥550	≥5	≥520	≥375	≥15
CK45	≥645	≥5	≥600	≥520	≥10
Q355B	≥640	≥5	≥600	≥520	≥14
Q355D	≥640	≥5	≥600	≥520	≥14
E355(ST52)	≥640	≥5	≥600	≥520	≥14
SAE1026	≥640	≥5	≥600	≥520	≥15

3.Tolerance:

Tolerance	I.D Tolerance			Tolerance of wall thickness
Size of I.D.	H8	H9	H10	<120mm(O.D) ≥120mm up to 210mm >210mm	±5% ±7.5% ±10%
30	0.033	0.052	0.084
>30-50	0.039	0.062	0.1
>50-80	0.046	0.074	0.12
>80-120	0.054	0.087	0.14
>120-180	0.063	0.1	0.16
>180-250	0.072	0.115	0.185
>250-315	0.081	0.13	0.21
>315-400	0.089	0.14	0.23

4.Processing Form

Processing form	I.Dmm	Length	Straightness	I.D tolerance	I.D Roughness (RA)
Honed	40-500	≤12M	0.5-1/1000	H8-H9	0.4-0.8um
SRB	50-250	≤12M	0.5-1/1000	H8	0.1-0.4um

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Precision Cold Drawn Honed Steel Tubing

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