【摘要】 液化天然气(LNG)船围护系统的材料选择影响液货舱的结构设计、安全性设计和成本设计,其中金属材料是与设计和制造过程关联程度最大的因素。讨论了围护系统的承力构件和保温层的组成结构,考虑在-196℃具有可行性的低温金属材料有Invar合金、304L不锈钢、Ni9钢和A5083铝合金。材料的导热性能影响隔热层设计和焊接冶金,强度影响板材厚度的设计,厚度则影响材料的成本、加工、搬运、安装和焊接。总结了4种金属材料的材料性能参数和焊接性。更多还原

【Abstract】 Materials selection of liquefied natural gas(LNG)cargo containment systems has influence on the design of structure,safety and cost.As cryogenic temperature metals make up the most in LNG carriers,they are closely related to the design and manufacture.Considering the bearing part and insulation part of containment system,four different metals including invar alloy,304 Lstainless steel,Ni9 steel and A5083 aluminum alloy can be taken into account.Thermal conductivity influences the insulation layer’s design and welding metallurgy,while low mechanical strength improves the thickness of plate that influences the processing,moving,installation and cost.Material parameters and welding techniques of them are summarized.更多还原