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Stainless Steel Honed Tube

In applications where exceptional corrosion resistance, cleanliness, and durability are paramount, stainless steel honed tubes emerge as the superior and often essential choice for hydraulic and pneumatic cylinder construction. These tubes combine the inherent benefits of stainless steel with a precision-engineered interior surface, making them ideal for challenging environments where standard carbon steel tubes would succumb to degradation.

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Description

The primary advantage of stainless steel honed tubes is their material composition. Typically manufactured from grades like 304/304L or 316/316L, these tubes offer excellent resistance to rust, oxidation, and a wide range of corrosive chemicals. This makes them indispensable in industries such as food and beverage processing (FDA/USDA applications), marine and offshore equipment, chemical processing, pharmaceutical manufacturing, and medical devices. Their non-porous, easy-to-clean surface prevents bacterial growth and ensures compliance with strict hygiene standards.

The manufacturing process involves meticulously honing the interior of a seamless stainless steel tube to achieve precise dimensional accuracy and a superior surface finish. The inner diameter is held to tight H8 or H9 tolerances, ensuring a perfect fit for seals and pistons, which is critical for maintaining pressure integrity and preventing leakages. Furthermore, the process guarantees excellent straightness (typically 0.5-1.0 mm/1000mm), which is vital for smooth, friction-free piston travel and preventing uneven seal wear.

The most critical outcome of the honing process is the achievement of an ultra-smooth internal surface with a roughness average (Ra) as low as 0.1 to 0.4 micrometers. This mirror-like finish serves multiple purposes: it drastically reduces friction between the piston seals and the tube wall, leading to higher system efficiency and lower operating temperatures. Most importantly, it significantly extends the service life of seals and wipers by minimizing abrasive wear, thereby reducing maintenance costs and downtime.

Available in various outer and inner diameters and custom lengths, these tubes can be further finished through processes like electrophishing to enhance their corrosion resistance and cleanability even further.

In conclusion, stainless steel honed tubes are not merely a alternative to carbon steel; they are a specialized solution for extreme operating conditions. By marrying the unparalleled corrosion resistance of stainless steel with the precision geometry and ultra-smooth finish of honing, they deliver unmatched reliability, longevity, and performance in the world's most demanding and corrosive applications. They are a fundamental component for engineers who cannot compromise on purity or performance.

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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