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Brinell, Vickers und Rockwell hardness tests of a metal (low hardness)


Brinell, Vickers und Rockwell hardness tests of a metal (low hardness)
Presentation for participants
Reference of the ILC: HD18SM
References of test methods: ISO 6506-1, ISO 6507-1, ISO 6508-1
Frequency: Each year
Main characteristics HBW2,5/187,5 (Brinell scale) - HV5, HV10, HV30 (Vickers scales) - HRB (Rockwell scale)
Other characteristics HBW10/3000, HBW5/750, HBW1/30 (Brinell scales) - HV20, HV50, HV100 (Vickers scales) - HRA, HRC, HRD, HRE, HRF, HRG, HRK, HR15N, HR30N, HR45N, HR15T, HR30T, HR45T (Rockwell scales)
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: 3
Product submitted to tests: Low hardness metal
Type of samples: Discs
Approximate dimensions of samples: ± 50x50x15 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: Forecast hardness level 100-250 HV