Appendix 1 - Material Testing Requirements and Acceptance Criteria for High Manganese Austenitic Steel
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1599/Rev.2 - Revised Guidelines on the Application of High Manganese Austenitic Steel for Cryogenic Service (MSC.1/CIRC.1599/REV.1) - (15 June 2022) - Appendix 1 - Material Testing Requirements and Acceptance Criteria for High Manganese Austenitic Steel

Appendix 1 - Material Testing Requirements and Acceptance Criteria for High Manganese Austenitic Steel

1 Test of base material  
  1.1 Chemical composition

Recognized standards, such as ASTM A1106/A1106M-17 or ISO 21635:2018.

 
  Test acceptance criteria

In accordance with recognized standards.

 
 

 
  1.2 Micrographic examination

This test should be carried out in accordance with 6.3.4 of the IGC Code and 16.2.4 of the IGF Code, i.e. recognized standards, such as ASTM E112.

 
  Test acceptance criteria

Microstructure to be reported for reference (i.e. grain size/precipitations).

 
 

 
  1.3 Tensile test

This test should be carried out in accordance with 6.3.1 of the IGC Code and 16.2.1 of the IGF Code.

Samples should be taken from three heats of different compositions, both at room and cryogenic temperatures.

 
  Test acceptance criteria

The yield, tensile strength and elongation should be in accordance with the recognized standard applied for Chemical composition (2.1) such as ASTM A1106/A1106M-17 or ISO 21635:2018.

 
 

 
  1.4 Charpy impact test

This test should be carried out in accordance with 6.3.2 of the IGC Code and 16.2.2 of the IGF Code.

 
  Test acceptance criteria

In accordance with table 6.3, as for austenitic steels, of the IGC Code and table 7.3 of the IGF Code.

Guidance note 9 of tables 6.3 and 7.3: Impact tests should not be omitted for high manganese austenitic steel owing to lack of experience.

  
 

 
  1.5 Charpy impact test on strain aged specimens

Recognized standards, such as ASTM E23.

 
  Test acceptance criteria

In accordance with table 6.3, as for austenitic steels, of the IGC Code and 16.2.2 of the IGF Code.

Guidance note 9 of tables 6.3 and 7.3 are not applicable for high manganese steel owing to lack of experience.

  
 

 
  1.6 Drop weight test

Recognized standards should be applied, such as ASTM E208. Tests should be carried out at -196°C.

 
  Test acceptance criteria

No break at test temperature as defined by the applied standard.

 
 

 
  1.7 Fatigue test (S-N curve)  
  The basis for establishing S-N Curves should be in accordance with 4.18.2.4.2 of the IGC Code and 6.4.12.2.4 of the IGF Code.  
  Test acceptance criteria

S-N curves should be minimum the fatigue strength as established curves for steel as defined in IIW or DNVGL-RP-C203.

 
 

 
  1.8 CTOD (crack tip opening displacement) test

Recognized standards, such as ASTM E1820, BS 7448 or ISO 12135, should be used for these purposes.

 
  Test acceptance criteria

CTOD minimum value should be in accordance with design specification for testing at room and cryogenic temperatures as per design conditions. As a guidance a minimum CTOD value of 0.2 mm is often required.

 
 

 
  1.9 Corrosion test

These tests should be carried out in accordance with recognized standards.

 
  Test acceptance criteria

In accordance with recognized standard or approved by the Administration.

 
  1.9.1 Intergranular corrosion test

This test should be carried out in accordance with recognized standard, such as ASTM A262.

 
  Test acceptance criteria

In accordance with recognized standard or approved by the Administration.

 
  1.9.2 General corrosion test

This test should be carried out in accordance with recognized standards, such as ASTM G31.

 
  Test acceptance criteria

In accordance with recognized standard or approved by the Administration.

 
  1.9.3 Stress corrosion cracking test

This test should be carried out to the satisfaction of the Administration, in accordance with recognized standards, such as ASTM G36 and ASTM G123.

 
  Test acceptance criteria

In accordance with recognized standard or approved by the Administration.

 
  1.9.4 Corrosion test for ammonia compatibility

The additional test should be carried out in accordance with the test requirements set out in appendix 2 to qualify for ammonia service.

 
  Test acceptance criteria

In accordance with the acceptance criteria set out in appendix 2.

 
2 Tests of welded condition (including HAZ)  
  2.1 Micrographic examination

This test should be carried out in accordance with 6.3.4 of the IGC Code and 16.2.4 of the IGF Code, i.e. recognized standards, such as ASTM E112 (or equivalent).

 
  Test acceptance criteria

Microstructure should be reported for reference (i.e. grain size/precipitations).

 
 

 
  2.2 Hardness test

This test should be carried out in accordance with 6.3.4 and 6.5.3.4.5 of the IGC Code and 16.2.4 and 16.3.3.4.5 of the IGF Code, i.e. recognized standards, such as ISO 6507-1.

 
  Test acceptance criteria

The hardness value should be reported for reference.

 
 

 
  2.3 Cross-weld tensile test

This test should be carried out in accordance with 6.5.3.5.1 of the IGC Code and 16.3.3.5.1 of the IGF Code as the relevant requirement for under-matched welds. Recognized standards, such as ASTM E8/E8M, should be applied.

 
  Test acceptance criteria

In accordance with 4.18.1.3.1.2 of the IGC Code and 6.4.12.1.1.3 of the IGF Code.

 
 

 
  2.4 Charpy impact test

This test should be carried out in accordance with 6.3.2 and 6.5.3.4.4 of the IGC Code and 16.2.2 and 16.3.3.4.4 of the IGF Code.

 
  Test acceptance criteria

In accordance with 6.5.3.5.3 of the IGC Code and 16.3.3.5.3 of the IGF Code.

 
 

 
  2.5 CTOD (crack tip opening displacement) test

Recognized standards, such as ASTM E1820, BS 7448 or ISO 15653, should be used for these purposes.

 
  Test acceptance criteria

CTOD minimum value should be in accordance with design specification for testing at room and cryogenic temperatures as per design conditions. As a guidance a minimum CTOD value of 0.2 mm is often required.

 
 

 
  2.6 Ductile fracture toughness test, JIc

Recognized standards, such as ASTM E1820 or ISO 15653. The ductile fracture toughness test may be omitted at the discretion of the Administration.

 
  Test acceptance criteria

In accordance with recognized standard.

 
 

 
  2.7 Bending test

This test should be carried out in accordance with 6.3.3 of the IGC Code and 16.2.3 of the IGF Code.

 
  Test acceptance criteria

No fracture should be acceptable after a 180° bend as required for welded material as per 6.5.3.5.2 of the IGC Code and 16.3.3.5.2 of the IGF Code.

 
 

 
  2.8 Fatigue test (S-N curve)

The basis for establishing S-N Curves should be in accordance with 4.18.2.4.2 of the IGC Code and 6.4.12.2.4 of the IGF Code.

 
  Test acceptance criteria

S-N curves should be minimum the fatigue strength as established curves for steel as defined in IIW or DNVGL-RP-C203.

 
 

 
  2.9 Corrosion test

These tests should be carried out in accordance with recognized standards.

 
  Test acceptance criteria

In accordance with recognized standard or approved by the Administration.

 
  2.9.1 Intergranular corrosion test

This test should be carried out in accordance with recognized standard, such as ASTM A262.

 
  Test acceptance criteria

In accordance with recognized standard or approved by the Administration.

 
 

 
  2.9.2 General corrosion test

This test should be carried out in accordance with recognized standards, such as ASTM G31.

 
  Test acceptance criteria

In accordance with recognized standard or approved by the Administration.

 
  2.9.3 Stress corrosion cracking test

This test should be carried out to the satisfaction of the Administration, in accordance with recognized standard, such as ASTM G36, ASTM G58 and ASTM G123.

 
  Test acceptance criteria

In accordance with recognized standard or approved by Administration.

 
  2.9.4 Corrosion test for ammonia compatibility

The additional test should be carried out in accordance with the test requirements set out in appendix 2 to qualify for ammonia service.

 
  Test acceptance criteria

In accordance with the acceptance criteria set out in appendix 2.

 
     

 References:

ASTM E466-15 Standard Practice for Conducting Force Controlled Constant Amplitude Axial Fatigue Tests of Metallic Materials

ASTM E1290-08e1 Standard Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement (Withdrawn 2013)

ASTM G31 Standard Guide for Laboratory Immersion Corrosion Testing of Metals.

ASTM B858 Standard Test Method for Ammonia Vapor Test for Determining Susceptibility to Stress Corrosion Cracking in Copper Alloys

ISO 12737:1999 Metallic materials – Determination of plane-strain fracture toughnessfootnote

ISO 15653:2018 Metallic materials – Method of test for the determination of quasistatic fracture toughness of weldsfootnote

IIW 1823-07 Recommendations for fatigue design of welded joints and components

ISO 12135:2016 Metallic materials – Unified method of test for the determination of quasistatic fracture toughness

ISO 15653:2018 Metallic materials – Method of test for the determination of quasistatic fracture toughness of welds

Parent topic: MSC.1/Circular.1599/Rev.2 - Revised Guidelines on the Application of High Manganese Austenitic Steel for Cryogenic Service (MSC.1/CIRC.1599/REV.1) - (15 June 2022)
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