Test of resistance of a stainless steel to intergranular corrosion (ASTM G48 Met. A)

Presentation for participants

 
Reference of the ILC: CO-X-SS6
   
References of test methods: ASTM G48 Met. A                   
   
Frequency: For this ILC, there is a risk that the number of registrations is insufficient. So a pre-registration procedure is put in place, as follows:
  1 - Participants interested in participating pre-register using the registration form. No invoicing is made for this pre-registration;
2 - When at least 10 potential participants have pre-registered, CompaLab asks each of these pre-registrees to confirm their willingness to participate and what are the characteristics for which they commit to provide results;
3 - If at least 8 participants confirm their intention to participate, the CIL organisation concerned is engaged.
   
   
Main characteristics: Speed of corrosion (loss of mass in a fixed exposure time, 72h - 2 temperatures 20° & 50°)
   
Other characteristics: Density, size, depth according to ASTM G46
  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: 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: 2 (2 temperatures of tests (20° & 50°))
Number of samples per participation: 6
Max number of operators per participation: 1 (it is necessary to order as many participations as there are participating test operators)
Product submitted to tests: Stainless steel
Type of samples: Parrallelepipeds
Approximate dimensions of samples: 50x25x5 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)