Test of resistance of a stainless steel to intergranular corrosion (ISO 3651-2 Met. B)

Presentation for participants

Reference of the ILC

CO22SS5

References of test methods

ISO 3651-2 Met. B

       

Frequency

Each year

Main characteristics

Pass/Fail (3 different types of stainless steels, showing various resistances to intergranular corrosion). Exposure time 20 h.

Other characteristics

Speed of corrosion (loss of mass in a fixed exposure time)

 

Caution The number of determinations may be low for the secundary characteristics, what may make inefficient the comparison between laboratories

       

Format of the test results:

Results of some properties are numerical and some are of Yes/No type.

   

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.

 

For results expressed as Yes/No type, samples are submitted to tests by sets of 2 items, with increasing severity, so that cut-off conditions for failure can be determined. The assessment of the results of participants is achieved by reference to this cut-off.

Number of products submitted to tests

3

Number of samples per participation

2

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

For this ILC, 3 different stainless steels with 3 different corrosion resistances are provided for testing.

Type of samples

Bars

Approximate dimensions of samples

Ø8x150 mm

Specific preparation to be performed by the participant

None (other than possible necessity to polish the test specimens or to adapt their dimensions to the equipment of the participant) (2 test pieces per supplied sample)

                   

Special notice for this ILC

The determination of the speed of corrosion is not described in the reference standard, but it helps to make the proficiency test efficient.

   

Time schedule:

 

Opening date of registrations

15/11/2021

Registration deadline

15/03/2022

Date of shipment of samples

05/06/2022

Start of the tests

10/06/2022

Deadline for carrying out the tests and providing the results

31/08/2022

Date of delivery of reports

15/10/2022

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

                       

Price (€)

300

Price if online payment (€)

240

Approximate weight (kg)

1