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Brinell, Rockwell and Vickers hardness tests on a high carbon steel


Reference of the ILC: HD17HM
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: Hard metal (heat treated steel)
Type of samples: Discs
Approximate dimensions of samples: ± Ø50x10 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)