Standard Test Method for Detecting Detrimental Phases in Lean Duplex Austenitic/Ferritic Stainless Steels

Importancia y uso:

4.1 Test Method A shall only be used to supplement the results of Test Methods B and C. It shall not be used as a rejection criterion, nor shall it be used as an acceptance criterion. Test Methods B and C are intended to be the procedures giving the acceptance criteria for this standard.

4.2 Test Method A can reveal potentially detrimental phases in the metallographic structure. As the precipitated detrimental phases can be very small, this test demands high proficiency from the metallographer, especially for thinner material.

4.3 The presence of detrimental phases is readily detected by Test Methods B and C provided that a sample of appropriate location and orientation is selected.

4.4 The tests do not determine the precise nature of the detrimental phase but rather the presence or absence to the extent that the normally expected toughness and corrosion resistance of the material are significantly affected.

4.5 This standard covers testing of samples taken from coil, coil- and plate mill plate, sheet, tubing, piping, bar and deformed bar, though some of these products might not be suitable for testing according to Method B (see Test Method B for further details). Other product forms have thus far not been sufficiently tested and documented to be an integral part of this standard, though the standard does not prohibit testing of these product forms according to the three test methods. For these other product forms, this standard gives only limited and non-exhaustive guidance as to interpretation of result and associated acceptance criteria.

4.6 Testing on product forms outside the present scope of this standard shall be agreed between purchaser and supplier.

Subcomité:

A01.14

Referida por:

A0240_A0240M-24, A0182_A0182M-24B, A0480_A0480M-24, A1069_A1069M-23, A0240_A0240M-24, A0923-23, A1127_A1127M-23, A0182_A0182M-24B, A1084-15AR22

Volúmen:

01.03

Número ICS:

77.040.99 (Other methods of testing metals)

Palabras clave:

acceptance testings; detrimental phases; duplex stainless steels; etch methods; ferric chloride testings; impact toughness testings; inhibited ferric chlorides; lean duplexes; microstructure evaluations; secondary phases; stainless steels;