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Determination of the grain size and of the content of non metallic inclusions of an austenitic steel

 

Reference of the ILC: ME17SS
References of test methods: ISO 643, ISO 4967
Frequency: Each year
Main characteristics G (Grain size), Rating of A, B, C, D, DS inclusions according to method A, Rating of A, B, C, D, DS inclusions according to method B
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 numerical. For each characteristic selected by the participant, 2 results 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 and for inter-sample homogeneity, limits of alerts for bias and repeatability of the participant, indiviual values for uncertainty of results of participants.
Number of samples per participant: 6
Product submitted to tests: Austenitic stainless steel
Type of samples: Bars
Approximate dimensions of samples: ± Ø40x100 mm
Specific preparation to be performed by the participant:  Preparation of surfaces of observation