World's First General Design Approval (GDA) for Developed Steel and Post-Weld Heat Treatment (PWHT) Exemption based on ECA for Low-pressure Liquefied CO₂ Tank made of KF460 steel

Tokyo, December 5, 2025 - Mitsubishi Shipbuilding Co., Ltd. (Mitsubishi Shipbuilding), a part of Mitsubishi Heavy Industries (MHI) Group, and Nippon Steel Corporation (Nippon Steel) have applied Nippon Steel's developed steel to the cargo tanks of low-pressure liquified CO2 (LCO2) carriers and have jointly developed the PWHT(Note1)-exemption technology based on ECA(Note2). Both companies have recently received the world's first General Design Approval (GDA)(Note3) from Nippon Kaiji Kyokai (ClassNK) for this technology.

World's First General Design Approval (GDA) for Developed Steel and Post-Weld Heat Treatment (PWHT) Exemption based on ECA for Low-pressure Liquefied CO₂ Tank made of KF460 steel
Tokyo, December 5, 2025 - Mitsubishi Shipbuilding Co., Ltd. (Mitsubishi Shipbuilding), a part of Mitsubishi Heavy Industries (MHI) Group, and Nippon Steel Corporation (Nippon Steel) have applied Nippon Steel's developed steel to the cargo tanks of low-pressure liquified CO2 (LCO2) carriers and have jointly developed the PWHT(Note1)-exemption technology based on ECA(Note2). Both companies have recently received the world's first General Design Approval (GDA)(Note3) from Nippon Kaiji Kyokai (ClassNK) for this technology.