Determination of the grain size and of the content of non metallic inclusions of a non alloyed steel

Presentation for participants

Reference of the ILC:



References of test methods:

ISO 643  ASTM E112  ISO 4967  ASTM E45 Methods A, D, E  EN 10247

References of test methods for which the ILC can indirectly provide an assessment of performance

DIN 50602


These may be superseded standards, which some of the reference standards may have replaced, or EN or ASTM or ISO standards that are close but not exactly equivalent to the reference standards.



Each year


Main characteristics:

G (Grain size), Rating of A, B, C, D, DS inclusions according to ISO 4967 method A and/or B and/or ASTM E45 method A and/or D and/or B - Ratings P, M, K according to EN 10247.


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:

For numerical results, the statistical computation will provide an assigned value with its attached uncertainty, values of standard deviations for repeatability and reproductibility, limits of alerts for bias and repeatability of the participant, indiviual values for uncertainty of results of participants.

Number of products submitted to tests:


Number of samples per participation:

Non alloyed steel: 3 - Grain size: 24

Max number of operators per participation:

10 (For this CIL, the type of test and sample size allow to provide results determined by several different operators)

Product submitted to tests:

For this ILC, a series of samples and a series of images are provided for evaluation.

Type of samples:

Bars - Document

Approximate dimensions of samples:

Bars: Ø18x30 mm - Document: 1x1 mm

Specific preparation to be performed by the participant:

Bars: Preparation of surfaces of observation - Document: None (other than possible necessity to adapt dimensions of the test specimen to the equipment of the participant)


Special notice for this ILC:

Results obtained by several methods may be provided (if the methods are not destructive)


Time schedule:


Opening date of registrations


Registration deadline


Date of shipment of samples


Start of the tests


Deadline for carrying out the tests and providing the results


Date of delivery of reports


Note: After the deadline, registrations are only accepted within the limit of availability of samples


Price (€)


Price if online payment (€)


Approximate weight (kg)