What is honed tube?

A Honed Tube is usually a CDS (Cold drawn seamless) steel tube or DOM (Drawn Over Mandrel) welded steel tube with inner diameter honed or skived &roller burnished, so honed tubing is with extremely precise Inner Diameter(ID) dimensions and smoothly ID surface. Honed tubes are broadly utilized to manufacturer and repair hydraulic cylinders and pneumatic cylinders. So in many fields, the honed tube is called cylinder tube also.

Hydraulic Honed Pipe

1. Description: Honed tube is a kind of smooth bore steel tube used to manufacture hydraulic cylinder barrels that is the core part of a piece of hydraulic cylinder. 
2. Commodity: Cold drawn seamless honed tube for hydraulic cylinder
3. Size range: 40mm*30mm-580mm*500mm
4. Available steel grade: 

5. Manufacture method: Cold rolled, hydraulic cold drawn, hot rolled+deep hole boring
6. Delivery condition: 

7. Bore treatment: Honing, skiving&roller burnishing
8. Bore roughness control: Ra0.25um max or Ra0, 35um max for honed tubes, Ra0.25um max for skived&roller burnished tubes. 
9. End finish: Plain ends with square cuts, free of burrs for honed tubes. Little bevelled ends for skived&roller burnished tubes. 
10. Standard export packing: In bundles tied with steel strips. Int&ext oil coating. End plastic caps. External packing by PVC bags and knit bags. 
11. Customized packing and markingcan be provided upon request. 
12. H8 tolerance: 

13. Difference between honed tube and skived&roller burnished tube: In hydraulic cylinder industry, there are 2 solutions for bore treatment: Honing, and skiving&roller burnishing. Honing or skiving&roller burnishing leads to different internal surface image, but both ensure good roughness.

14. Honed tube Manufacturing standards

Honed tubes can be manufactured & supplied with international standards as below:

• DIN 2391 part 1: Seamless precision steel tubes – Dimensions
• DIN 2391 part 2: Seamless precision steel tubes – Technical delivery conditions
• EN10305-1: Steel tubes for precision applications –Technical delivery conditions Part 1: Seamless cold drawn tubes
• ASTM A519 /A519M: Standard Specification for Seamless Carbon and Alloy Steel Mechanical Tubing
• ASTM A513 /A513M: Standard Specification for Electric-Resistance-Welded Carbon and Alloy Steel Mechanical Tubing
• JIS G3445: Carbon Steel Tubes for Machine Structural Purposes

Besides the above popular standards, we also can produce honed steel tubing as per customized requirements upon customers’ requests.

Product Descriptions: Specification of honed tube

As one of the leading China honed tubing manufacturers and honed tube suppliers, our factory can produce a wide range sizes and various materials of honed id tube as below.

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    4.1. Main types of honed tube

• • • CDS honed steel tube

The CDS honed cylinder tubes are manufactured from Cold Drawn Seamless Steel Tubes. They are usually produced as per standard DIN 2391, EN10305-1, ASTM A519 etc.

• • • DOM honed ID tubes

The DOM honed pipes are manufactured from Drawn Over Mandrel Electric-Resistance-Welded Carbon Steel Tubes. These tubes are manufactured as per standard of ASTM A513.

Normally our factory’s product of honed cylinder tubes are cold draw seamless steel tubes (CDS honed ID tubes).

Metric honed tube size

YNS  tube factory produces honed steel tubes in below metric size range.

Inside Diameter (ID): 32 mm to 600 mm;

Outer Diameter (OD): 40 mm to 720 mm;

Wall thickness: 4 mm to 60 mm;

Length: we can supply honed pipe with random length or with fixed length up to 15000 mm.

• • 4.5 Inner Diameter Manufacturing Method

Honed tubes which including hydraulic cylinder tubes and pneumatic cylinder tubing usually are produced by honing processing or SRB (Skived & Roller Burnished) processing after cold drawing and heat treatment. The mother tube we usually use “Suitable To Hone” Cold Drawn Seamless Tubes. The process of the honed ID tubing is determined upon the dimension, mold available and the request of the customer.

• • • 4.5.1 Honing

Under the honing process, abrasive polishing stones and paper are used to grind to remove small amounts of material in the tube ID, in order to achieve the required extremely precise ID dimensions tolerances, and to remove surface imperfections from the tube drawing process and get the desired surface finish.
Utilizing the honing process, Younglee can supply honed steel tubing with ID dimensional tolerances as precise as 0.021mm (H7), and surface roughness better (smoother) than Ra 0.8um.

• • • 4.5.2 SRB (Skiving & Roller Burnishing)

The process of Skiving & Roller Burnishing (SRB for short) is a single pass operation that uses a Skiving tool on the forward stroke to skive the tube ID to the required size, and uses roller bearings on the reverse stroke, to burnish the surface to the required roughness. SRB process is faster than honing and normally can produce more precision tolerances and smoother surface finish than honing.
Utilizing the SRB process, Younglee can supply honed steel tubing (which are seamless skived tubes) with ID dimension tolerance as precise as 0.021mm (H7), and inside surface roughness smoother than Ra 0.4um.

Normally, hydraulic cylinder tubes and pneumatic cylinder tubing produced by the above two processing are both called Steel Honed Cylinder Tube. Skived &Roller burnished tube is a kind of honed tube. To choose which manufacturing method, it depends on customers’ preference and the ID of the cylinder tube. Sincerely, nowadays more and more honed tubes are manufactured through the method of skiving & roller burnishing.

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    Packing of honed cylinder tube

We pack our honed tubes as per Specification A700, latest revision, “Standard Practices for Packaging, Marking, and Loading Methods for Steel Products for Shipment.”

All the honed pipes will be oiled by the anti-rust oil before delivery. And to protect the inner diameter surface of the honed ID tubing, we will cap the tube ends with plastic end caps, or if customer request we can weld a steel cap to protect the inner diameter of the honed id tubing during loading and unloading. And then the honed pipes will be packed with seaworthy package such as wooden cases or plastic bags.

• • Advantages / Features of our honed tubing

YNS As one of the main China hone tube manufacturers and suppliers, honed steel tubes produced in Younglee’s factory have features as below.

• • • Super Smooth inside surface

The inside surface roughness is Max Ra 0.4 microns ID finish (Max 16Ra ID finish).

• • • High precision tolerance

The inner diameter tolerance of ID honed tubing could be H7, H8, H9 according to customers request.

• • • Durable in use

As the first class quality honed tube supplier, our factory only uses prime quality raw materials, which insures the honed cylinder tubes durable in use.

• • • Seamless tube with high pressure resistance;

We mostly use seamless cold drawn tubes to produce honed pipes, which means our honed tubing can work under higher pressure, thus our honed pipes are more reliable for hydraulic cylinder applications.

• • • Flexible order quantity

We accept small quantity orders, even if there is only one piece of hydraulic cylinder tubing we can produce and supply.

• • • Good weld-ability:

The weld-ability of our honed steel tube is very good, this is quite helpful for manufacturing the cylinders.