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Charpy pendulum impact test on non alloyed steels at -50°C


Reference of the ILC: CL17NS
References of test methods: ISO 148-1
Frequency: Each year
Main characteristics KV2 (Absorbed energy), LE (Lateral expansion)
Other characteristics KV8, KU2, KU8 (Absorbed energie), FA (Fracture appearance)
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: 6
Product submitted to tests: Non alloyed steel
Type of samples: Parrallelepipeds
Approximate dimensions of samples: ± 60x20x20 mm
Specific preparation to be performed by the participant:  Machining of test specimens
Special notice for this ILC: Temperature for testing: -50°C
The participating laboratory determines the energy values (KU2, or KU8, or KV2, or KV8) which it wishes among the proposed ones. The participant must choose only one type of energy U2, U8, V2 or V8 as described on the reference standard, according to its habits, and apply it in the same way one each of the samples it receives.
A participant who would wish to determine several types of absorbed energy must register as many participations as the number of types of energy it wishes to determine.
The results of the participants who did not fulfil this requirement will not be taken into account in the data processing (because the number of values for each type of values is then not large enough).