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Test of resistance to intergranular corrosion of stainless steels (Strauss test)

 

Reference of the ILC: CO17SS
References of test methods: ISO 3651-2
Frequency: Each 3 years
Main characteristics Pass/Fail (2 samples of 6 different types of stainless steels, showing various resistances to intergranular corrosion). Method C. Exposure time 20 h.
Other characteristics -
Caution: The number of determinations may be low for the secundary characteristics, what may make inefficient the comparison between laboratories
                   
Determination of the assigned values (“true values” for each characteristic):
By statistical computation of the totality of the results with possible selection on competence criteria (accreditation, validation by a reference body, quantity of tests performed in the year), test to detect possible collusion, merging of results not obtained in reproductibility conditions, suppression of technically unvalid results.
Type of statistical computation:
Results are of yes/no type. 12 samples are submitted to tests, by sets of 2 items, with increasing severity, so that cut-off conditions for failure can be determined. The assessment of the results of participants is achieved by reference to this cut-off.
Number of samples per participant: 12
Product submitted to tests: Stainless steel
Type of samples: Bars
Approximate dimensions of samples: ± Ø10x100 mm
Specific preparation to be performed by the participant:  None (other than possible necessity to adapt dimensions of the test specimen to the equipment of the participant)