Stelmi Italia S.p.A.

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Qualität und Prüfung: Kolbenstange

Quality Assurance

The Quality Assurance System ensures mill traceability, during the manufacturing process up to shipment, by way of a code stamped onto the ends of the bars.

Standard controls:

Standardprüfungen auf 100% der Kolbenstangen:
- Durchmesser;
- Form-Fehler;
- Visuelle Suche von Einzelfehler;
- Dicke der Verchromung.


die Zeugnisse sind immer laut Norm UNI EN 10204 / 3.1 B. mitgeliefert

controllo diametro e triangolarita


The international specification used for evaluating corrosion resistance is ISO 9227/10.289,
which references three different corrosion tests:

- neutral salt spray, NSS (the old ISO 3768, equivalent to the ASTM B 117);
- acetic salt spray, ASS (the old ISO 3769, equivalent to ASTM B 287);
- copper accelerated salt spray, CASS (the old ISO 3770, equivalent to ASTM B368).

The test chamber is always the same and the spray operates continuously. Samples are inclined at 15° from
the vertical. As alternative to the ISO 9227 is sometime used the NSS with alternate cycle, according to KES 05-507-2.
In this test the salt spray operates not continuously, but in cycles. After the test the samples are rinsed with water and examined according to the specification ISO 10.289, which regulates the evaluation of the results, assigning a "rating" to the surface under examination.
A "Rating 9" corresponds to 0.1% of the surface corroded. A "Rating 10" means no corrosion at all.

UNI ISO 9227

This specification, which corresponds to the international one, gives a description of the methods and the equipment to be used for corrosion tests. It presents three types of testing, progressively more aggressive. The specification considers the neutral salt spray the most suitable testing method for evaluating a surface which is chromium plated only.