Park Minho, Kim Jisun, Pyo Changmin, Son Joonsik, Kim Jaewoong
Southwestern Branch Institute, Research Institute of Medium & Small Shipbuilding, Jeonnam 58457, Korea.
Smart Manufacturing Process R&D Group, Korea Institute of Industrial Technology, Gwangju 61012, Korea.
Materials (Basel). 2021 Mar 28;14(7):1659. doi: 10.3390/ma14071659.
The environment of the global shipbuilding market is changing rapidly. Recently, the International Maritime Organization (IMO) has tightened regulations on sulfur oxide content standards for marine fuels and tightened sulfur oxide emission standards for the entire coastal region of China to consider the environment globally and use LNG as a fuel. There is a tendency for the number of vessels to operate to increase significantly. To use cryogenic LNG fuel, various pieces of equipment, such as storage tanks or valves, are required, and equipment using steel, which has excellent impact toughness in cryogenic environments, is required. Four steel types are specified in the IGG Code, and 9% Ni steel is mostly used for LNG fuel equipment. However, to secure safety at cryogenic temperatures, a systematic study investigating the causes of quality deterioration occurring in the 9% Ni steel welding process is required and a discrimination function capable of quality evaluation is urgent. Therefore, this study proposes a plan where the uniform quality of 9% Nickel steel is secured by reviewing the tendency of the solidification crack susceptibility among the quality problems of cryogenic steel to establish the criteria for quality deterioration and to develop a system capable of quality discrimination and defect avoidance.
全球造船市场环境正在迅速变化。最近，国际海事组织（IMO）收紧了对船用燃料硫氧化物含量标准的规定，并收紧了中国整个沿海地区的硫氧化物排放标准，以在全球范围内考虑环境因素，并使用液化天然气（LNG）作为燃料。运营船舶数量有显著增加的趋势。要使用低温LNG燃料，需要各种设备，如储存罐或阀门，并且需要在低温环境下具有优异冲击韧性的钢材制成的设备。IGG规范中规定了四种钢材类型，9%镍钢大多用于LNG燃料设备。然而，为确保低温环境下的安全性，需要进行系统研究，调查9%镍钢焊接过程中质量恶化的原因，并且迫切需要一种能够进行质量评估的判别功能。因此，本研究提出了一个计划，通过审查低温钢质量问题中凝固裂纹敏感性的趋势来确保9%镍钢的质量均匀性，从而建立质量恶化标准，并开发一个能够进行质量判别和避免缺陷的系统。
