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Test of resistance of a stainless steel to intergranular corrosion (ISO 3651-2 Met. B)

 

CO18SS5
Test of resistance of a stainless steel to intergranular corrosion (ISO 3651-2 Met. B)
Presentation for participants
                   
 
Reference of the ILC: CO18SS5
References of test methods: ISO 3651-2 (Met B)
Frequency: Each year
Main characteristics Pass/Fail (3 samples of 4 different types of stainless steels, showing various resistances to intergranular corrosion). Method B. Exposure time 20 h.
Other characteristics Speed of corrosion (loss of mass in a fixed exposure time)
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 numerical. For each characteristic selected by the participant, 1 result shall be provided for each sample. The statistical computation will provide an assigned value with its attached uncertainty, values of standard deviations for repeatability, for reproductibility, limits of alerts for bias and repeatability of the participant, indiviual values for uncertainty of results of participants.
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)
                   
Special notice for this ILC: The determination of the speed of corrosion is not described in the reference standard, but it helps to make the proficiency test efficient.