Exceptional corrosion resistance
Exceptional quality able to satisfy extreme requirements: standing a 500 hours test in neutral salt spray, according to ISO 9227, obtaining a high rating according to ISO 10.289: rating 10.
Diameters up to 20 mm, Double Chromelayer 2x14 μm, tolerancef 8
Diameters over 20 mm, Double Chromelayer 2x20 μm min., tolerance f7
Chromelayer hardness HRC 66-69
(HV 0,1 / HV 850-1000)
Roughness Ra max. 0,20 μm
in Neutral Salt Spray
The HIPERCROMIUM® technology is in use for chromium plating:
LABORATORY TEST according to ISO 9227 (NSS)
Results evaluation according to ISO 10.289
DIAMETERS > 25 mm
|Straightness||Better than 0,5 / 2000 m|
|Tolerance||According to ISO f7|
|Out of roundness||Within ½ of ISO tolerance field|
|Surface Roughness||Ra < 0,2 μm|
Rt < 3 μm max.
|Chromium Layer Hardness||HRC 66 - 69 (HV 0,1 / HV850-1000)|
|Steel Grades||CK 45, 18MnV5 / 20MnV6|
|Induction Hardening||CK 45/50,|
Gauss distribution of corrosion tests results.
Stelmi: Rating 10
Competition: rating 9 as anaverage.
The graphic shows the substantial difference between what Stelmi declares about the evaluation of the corrosion resistance (Rating) and what is often declared by other producers. Gauss distribution of
corrosion tests results »
The HIPERCHROMIUM technology has established new standards in the fluidpower industry: 200, 500 and 1000 hours of corrosion resistance in Neutral Salt Spray test ( in compliance with ISO 9227 standard) with a minimum rating ) ( according to ISO 10289 standard).
A technological milestone than many companes still try to reach.
Thousands tests in our quality laboratory confirmed by indipendent laboratories and by the most prestigious Customers around the world proved the reliability of this technology.
The HIPERCHROMIUM TECHNOLOGY is fully developed in our R&R Department: mone than 35 years of technological know-how, proudly MADE IN ITALY.
good to know