These are elements that carry fluids or air from tanks to buyers and back to the tank from the buyers in hydraulic units. High pressure seamless steel pipes from the cold seamless pipes are manufactured in EN 10305-4 E235+N (ST37-4 NBK) or E355+N (ST52 NBK) quality standards. Both ends are closed and are suitable for bending. According to the place they are used and their purpose, they can be manufactured as oily, with phosphate or Cr6 free galvanisation.
Application Areas
- Hydraulic and Pneumatic Line Pipes – EN 10305-4 E235+N (ST37-4 NBK) or E355+N (ST52 NBK)
Seamless and welded cold drawn precision steel tubes in acc. with EN10305-1 and EN10305-2
Area of use
The applications for seamless and welded precision steel tubes are determined by special technical features. These are as follows:
- » High dimensional accuracy for inside and outside diameters
- » Smooth surfaces achieved by drawing
- » Improved strength characteristics due to cold forming
- » Closely graduated dimensional range
- » Low concentricity in welded precision steel tubes
Production method
The pre-material for precision steel tubes is selected, fully killed LD or electrical steel cast continuously in slabs. It is first checked and then processed into hollow pre-materi- al tubes.
The hollows are cold formed on state of the art drawing benches. Subsequent heat treatment and passage through high-tech straightening and testing benches comple- te the production process into cold drawn precision steel tubes.
Seamless cold drawn precision steel tubes for hydraulic and pneumatic lines
Area of use
The tubes are used for hydraulic or pneumatic lines. Assembly may be by means of detach able or non-detachable joints. Changes in the speed and pressure of the flowing medium oc- cur during the operation of hydraulic systems. These changes in speed result in pressure sur- ges which overlay the internal pressure. Thus the tube is subject to cyclic stress.
The allowed pressure rates and temperature are the responsibility of the customer in accor- dance with the state of the art and in applica-
tion of the safety coefficients specified in the applicable regulations, codes or standards.
Technical delivery terms
Unlike EN10305-1, we produce these tubes with an inside diameter ranging from 4 – 10 mm with restricted tolerances and improved inner surface. The tubes are free from production residues which could impair the function of a hydraulic system
Seamless cold drawn precision steel tubes for the manufacture of hydraulic, pneumatic and telescopic cylinders and piston tubes
Precision steel tubes for honing, skiving and roller burnishing
Technical delivery terms
In general EN10305-1 is applicable (EN10305-2 on request). Deviating from this are the tole- rances for inside diameter, concentricity and delivery condition plus straightness
Cylinder tubes: Dimensions and permissible machining allowances for E355
