Heat treatment is necessary for H8 honed tubes in order to improve their mechanical properties and make them more suitable for their intended application. The heat treatment process involves heating the steel to a specific temperature and then cooling it down slowly, which can result in changes in its microstructure and properties. In H8 honed tubes, a continuous ans smooth surface can be obtained on the inner diameter thanks to the skiving and burnishing technique.
H8 honed tubes that Datong Hydraulic produced are in EN10305 standards in various size and E355+SR（DIN2391 ST52 BK+S）quality standards and all of them are cold drawn and stress released.
Material: E355 ST52
Delivery Condition: BK, BK+S, GBK, NBK
ID Size : 20mm – 1500mm
Length: max 16m
Type: Seamless, Hot Rolled, Cold Rolled, Cold Drawn
Straightness: ≤ 0.5/1000
Roughness: 0.2-0.4 um
Tolerance EXT: DIN2391, EN10305, GB/T 1619
Tolerance INT: H7,H8,H9
ADVANTAGES OF H8 HONED TUBE
1, High precision tolerances;
Our honed barrel tube can meet ID tolerance H8, H9, … etc according to the customer’ requirements, and its I.D dimension.
2, Seamless tube with high pressure resistance;
We only 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.
3, High Smooth inside surface;
The roughness of our honed pipe is Max Ra 0.4 microns ID finish .
4, Good weldability: The weldability of our honed steel tubing is very good, this is quite helpful for manufacturing the hydraulic cylinders.