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Precision Cold Drawn Honed Steel Tubing

Precision cold drawn honed (CDH) steel tubing represents the pinnacle of performance and quality in the realm of seamless mechanical tubing. It is a specialized product engineered for applications demanding exceptional dimensional accuracy, superior surface finish, and outstanding mechanical properties, most commonly as cylinder barrels in hydraulic and pneumatic systems.

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Description

The manufacturing process is a two-stage operation that defines its superior characteristics. It begins with cold drawing, where a seamless steel shell is pulled through a die at room temperature. This process cold-works the steel, significantly increasing its tensile strength, yield strength, and hardness while achieving tight outside diameter (OD) and wall thickness tolerances.

The critical second stage is honing, an abrasive machining process. The cold drawn tube's inner diameter (ID) is precision-honed using rotating abrasive stones. This step accomplishes three vital objectives: First, it delivers an exceptionally smooth and consistent internal surface finish, typically measured in micro-inches (Ra). A mirror-like finish is crucial for minimizing friction and wear on seals and pistons, ensuring efficient operation and long service life. Second, it achieves ultra-precise internal dimensional tolerances and straightness. Third, the honing process creates an ideal cross-hatch surface pattern, which is optimal for retaining lubrication and facilitating effective seal break-in.

The combination of these processes results in a tube with unparalleled properties:

Excellent Geometric Control

Tight tolerances on OD, ID, and wall thickness.

Superior Surface Finish

A smooth, honed ID surface that reduces friction and seal wear.

Enhanced Mechanical Properties

High strength and hardness from cold working.

Immediate Readiness for Use

The tubes are typically supplied clean, phosphate-coated, and oiled, ready for assembly without further machining.

Consequently, precision CDH tubing is the material of choice for hydraulic cylinders, pneumatic cylinders, shock absorbers, linear actuators, and various high-precision applications in industries such as construction, agriculture, manufacturing, and aerospace, where reliability and performance are non-negotiable. It provides the critical foundation for efficient and durable fluid power systems.

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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