Hard chromium-plated piston tubes

Application
Hard chromium-plated piston tubes are used for the manufacturing of cylinders, which require low weights.

Exact description
Hard chromium-plated piston tubes according to
DIN 2391, normalized heat treated.

Material
St 52.0, material-no. 1.0421

Dimensions
Outside diameter: 16 - 140 mm
Wall thickness: 2 - 10 mm

Tolerances
Outside diameter: ISO-f7
Wall thickness and inside diameter according to DIN2391

Thickness of the chromium layer
Outside diameter: 16 and 18 mm: 18 +/- 3 µm
Outside diameter: 20 up to 140 mm: 25 +/- 5 µm

Surface roughness
Outside diameter:
· Ra value max. 0.3 µm
· Rt value max. 2 µm

Hardness of chromium layer
min. 66 - 68HRC

Lengths
Production lengths approx. 6 metres. Upon demand supply of fixed or combinable lengths.

Test certificate
Upon demand all the tubes can be supplied with an EN 10204-3.1B factory certificate.

Mechanical features

Material	Tensile strength (N/mm2)	Yield Stress (N/mm2)	Elongation (%)	Delivery state
ST 52.0	510	350	20	normalized

Delivery Time
Delivery max. 2 weeks.