Project Description
Commitment to You
We are committed to integrate steel resources in china and serve the global steel market. We have 15+ years of experience in steel researching, production, managing and sales.
Our ability to purchase materials directly from leading mills will give you the competitive edge. Any Questions Just Call +86-731-89903933
Tubes for hydraulic cylinders
Tubes for mechanical machining – type HPZ are precision seamless tubes for the production of hydraulic cylinders or seals of piston rods. The inner working surface is obtained by mechanical machining, by honing or peeling and subsequent rolling.
Tubes intended for direct use in the cylinders – type HP are seamless tubes with a precisely machined inner surface, which are primarily intended for the manufacture of hydraulic cylinders. The inner working surface is achieved by peeling and subsequent rolling of the inner surface of the tubes.
Tubes intended for piston rods and telescopic cylinders – type HPK are cold drawn seamless tubes for piston rods, telescopic cylinders and cylinder liners. Use of tube piston rods and pistons is often preferable than the use of solid materials. Use of the tube material, which exhibits the same resistance to load stress, bending and in torsion, means a significant reduction in the weight of the cylinder.
Dimensions of hydraulic cylinder tubes
Precision tubes for mechanical machining – HPZ type
INNER DIAMETER (ID) 40,0 – 115,0 mm
WALL THICKNESS (WT) 5,0 – 10,0 mm
Precision tubes machined to “ready to use” – type HP
INNER DIAMETER (ID) 40,0 – 110,0 mm
WALL THICKNESS (WT) 4,0 – 10,0 mm
Precision tubes destined for piston rods – type HPK
OUTER DIAMETER (OD) 40,0 – 120,0 mm
WALL THICKNESS (WT) 5,0 – 10,0 mm
Steel grades for hydraulic cylinders
EN 10305-1 E355
EN 10 294-1 20MnV6
STN/ČSN 42 0260 11 523
DIN 2391-2 St52
DIN 17100 St52-3
Tolerances for hydraulic cylinders
for mechanical machining – HPZ type
Tolerances of the outside diameter (OD) HPZ tubes meet the appropriate dimensional table standards. Tolerances values of the inside diameter (ID) are presented in the table .
Tolerance of the wall thickness is -/+ 7.5% of the wall thickness.
HPZ tubes eccentricity is included in the wall thickness tolerance
for HP tubes
Tolerances of the outside diameter (OD) HP tubes meet the appropriate dimensional table standards DIN 2391-1, EN 10305-1. Tolerances values of the inside diameter (d) H8 a H9 are presented in the table.
Tolerance of the wall thickness is -/+ 7.5% or 10% of the wall thickness.
HP tubes eccentricity is included in the wall thickness tolerance.
Length of tubes for hydraulic cylinders
(a), manufactured length of precision tubes in the range of 3 to 6 meters
(b), maximum precise length 6 meters
Tube testing
Selection of the tests is either according to standards or upon agreement with customer:
- cast / chemical analysis,
- tensile test,
- dimensional inspecti,
- visual inspection,
- NDT to find longitudinal defects.
Other tests are possible upon agreement.
Certified test reports
According to EN 10 204 – 3.1.
Straightness of tubes
Straightness of the tubes is 0,001 multiple of the tube length maximum, allowed straightness for one meter length is 1.0 milimeters.
Delivery condition of tubes
The tubes are delivered as cold drawn and annealed to relieve the stress BKS (+SR).
Other delivery conditions are possible upon agreement.
Experienced 15+ Years
Our ability to purchase materials directly from leading mills at the best possible price will give you the competitive edge. This coupled with a skilled workforce dedicated to embracing the demands of the markets.
We Can Supply Follows Products with High Quality:
- Cold Rolled Steel Tube
- Cold Drawn Steel Tube
- Hollow Bar
- Honed Tube
- Plated Tube
- Plated Bar
- Boiler Tube
All Products According Quality Standard Strictly:
- ASTM: ASTM A519, ASTM A513.
- JIS:JIS G3441, JIS G3445, JIS G3466, JIS G3459.
- DIN: DIN1626, DIN1629, DIN2391, DIN2393, DIN2448, DIN2458.
- EN: EN10305.
- BS: BS6323.
Wide Range of Pipes to Fit Your Industry:
- OD from 5mm to 820mm.
- Wall Thickness from 0.1 to 100mm.
- Length up to 50mtr per pc.
Can’t Find What You Looking for? Check Popular Items Blew.
Direct from the Source and Deliver to You in a Very Fast and Efficient Timeframe.