[:es]
The new cryogenic high-manganese steel developed by POSCO in Korea has gone into service for the first time in a 500 m3 LNG bunker tank on a bulk carrier.
The dual-fuel ship is the 50,000 dwt Ilshin Green Iris, built by Hyundai Mipo Dockyard (HMD) for Ilshin Shipping and chartered to POSCO. The Korean steelmaker will utilise the bulk carrier on a domestic route, transporting limestone from Gangwon-do to Gwangyang.
Lloyd’s Register and the Korean Register have provided Ilshin Green Iris with dual classification and certification, verifying the vessel’s compliance with the International Code of Safety for Ships using Gases or other Low-Flashpoint Fuels (IGF Code).
The bulk carrier’s cylindrical bunker tank has been constructed as an IMO Type C pressure vessel unit. It sits athwartships on the aft deck, behind the accommodation superstructure.
Following more than a decade of research, POSCO developed the high-manganese austenitic steel with the storage and transport of LNG specifically in mind. Of proven strength and cryogenic toughness, the steel can withstand temperatures as low as -196℃. Among the steelmaker’s claims for the product is its ease of weldability and a cost 20-30% below the nickel alloy steel, stainless steel and aluminum alloy alternatives.
High-manganese steel has also shown superiority over existing cryogenic materials in terms of ultimate tensile strength and elongation. In addition, the relatively small thermal expansion coefficient of the steel means that the displacement caused by the temperature changes inherent in cryogenic applications is minimal.
POSCO’s high-manganese steel was registered as a standard technology with the American Society for Testing and Materials (ASTM) in May 2017. The ASTM stamp of approval means that the steel is recognised as a material that can be safely used worldwide.
In May 2016, following a proposal from South Korea, IMO began to consider the suitability of high-manganese austenitic steels as a suitable material for cargo tanks, fuel tanks and piping on LNG carriers and LNG-fuelled ships. The initiative was launched with a view to amending the IGF Code and the International Gas Carrier Code (IGC Code) to include this steel.
IMO deliberations to date have resulted in a decision to limit the use of high-manganese steel to cargo and fuel tank plates only. Furthermore, if it is confirmed that the steel is suitable as a plate material, rather than incorporate the outcome as draft amendments to the IGC and IGF Codes, IMO should develop draft interim guidelines for its application.
A correspondence group is continuing work on this topic and will report its findings to the 5th Session of IMO’s Sub-Committee on the Carriage of Cargoes and Containers (CCC 5) in September 2018.
Source: LNG World Shipping[:en]
The new cryogenic high-manganese steel developed by POSCO in Korea has gone into service for the first time in a 500 m3 LNG bunker tank on a bulk carrier.
The dual-fuel ship is the 50,000 dwt Ilshin Green Iris, built by Hyundai Mipo Dockyard (HMD) for Ilshin Shipping and chartered to POSCO. The Korean steelmaker will utilise the bulk carrier on a domestic route, transporting limestone from Gangwon-do to Gwangyang.
Lloyd’s Register and the Korean Register have provided Ilshin Green Iris with dual classification and certification, verifying the vessel’s compliance with the International Code of Safety for Ships using Gases or other Low-Flashpoint Fuels (IGF Code).
The bulk carrier’s cylindrical bunker tank has been constructed as an IMO Type C pressure vessel unit. It sits athwartships on the aft deck, behind the accommodation superstructure.
Following more than a decade of research, POSCO developed the high-manganese austenitic steel with the storage and transport of LNG specifically in mind. Of proven strength and cryogenic toughness, the steel can withstand temperatures as low as -196℃. Among the steelmaker’s claims for the product is its ease of weldability and a cost 20-30% below the nickel alloy steel, stainless steel and aluminum alloy alternatives.
High-manganese steel has also shown superiority over existing cryogenic materials in terms of ultimate tensile strength and elongation. In addition, the relatively small thermal expansion coefficient of the steel means that the displacement caused by the temperature changes inherent in cryogenic applications is minimal.
POSCO’s high-manganese steel was registered as a standard technology with the American Society for Testing and Materials (ASTM) in May 2017. The ASTM stamp of approval means that the steel is recognised as a material that can be safely used worldwide.
In May 2016, following a proposal from South Korea, IMO began to consider the suitability of high-manganese austenitic steels as a suitable material for cargo tanks, fuel tanks and piping on LNG carriers and LNG-fuelled ships. The initiative was launched with a view to amending the IGF Code and the International Gas Carrier Code (IGC Code) to include this steel.
IMO deliberations to date have resulted in a decision to limit the use of high-manganese steel to cargo and fuel tank plates only. Furthermore, if it is confirmed that the steel is suitable as a plate material, rather than incorporate the outcome as draft amendments to the IGC and IGF Codes, IMO should develop draft interim guidelines for its application.
A correspondence group is continuing work on this topic and will report its findings to the 5th Session of IMO’s Sub-Committee on the Carriage of Cargoes and Containers (CCC 5) in September 2018.
Source: LNG World Shipping[:]