Part I - General
Clasification Society 2024 - Version 9.40
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) - Annex - Revised Guidelines on the Application of High Manganese Austenitic Steel for Cryogenic Service - Part I - General

Part I - General

 1 Scope

These Guidelines on the application of high manganese austenitic steel for cryogenic service provide the designer and manufacturer with practical information on the design and construction of cargo and fuel tanks using high manganese austenitic steel for cryogenic service, to comply with the Design Conditions defined in section 4.18 of the IGC Code and section 6.4.12 of the IGF Code.

 2 Application

2.1 These Guidelines are not intended to replace any requirements of the IGC and IGF Codes. They are intended as complementary requirements for the utilization of high manganese austenitic steel in the design and fabrication of cargo and fuel tanks complying with the IGC and IGF Codes subject to the following:

  • .1 Application is suitable for the following cargoes and/or fuels if authorized by the IGC and IGF Codes:

    • .1 Butane (all isomers);

    • .2 Butane-propane mixture;

    • .3 Carbon Dioxide (High Purity and reclaimed quality);

    • .4 Ethane;

    • .5 Ethylene;

    • .6 Methane (LNG);

    • .7 Pentane (all isomers); and

    • .8 Propane.

  • .2 Application is limited to plates (hot rolled) between 6 mm and 40 mm thick.

2.2 The application of high manganese austenitic steel for cargo and fuel tanks is limited by the requirements specified in the following.

 3 Definitions

High manganese austenitic steel: Steel with a high amount of manganese in order to retain austenite as its primary phase at atmospheric and service temperature.
Under-matched welds: For welded connections where the weld metal has lower yield or tensile strength than the parent metal.
Parent topic: Annex - Revised Guidelines on the Application of High Manganese Austenitic Steel for Cryogenic Service
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