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本文总结了保证液化天然气储罐安全,防止脆性断裂的工艺。讨论精确模拟短裂纹抑制概念的表面双缺口拉伸试验方法,并确定三种9%Ni钢(普通型、低磷硫型、低磷硫直接调质型)及其焊接件的止裂韧性。降低磷硫含量有助于改善其止裂韧性。其次,讨论了裂纹起始韧性,并可以断定降低杂质能改善断裂韧性并抑制9%Ni钢的韧性破坏。直接调质钢具有与普通调质钢相同的断裂韧性,并得出直接调质的9%Ni钢适用于制造液化天然气储罐的结论。
This paper summarizes the process to ensure the safety of liquefied natural gas storage tanks and prevent brittle fracture. The double-notched tensile test method for accurately simulating the concept of short-crack suppression is discussed. The crack-arresting toughness of three kinds of 9% Ni steels (ordinary type, low-phosphorus sulfur type and low phosphorous sulfur direct quenched type) and their welded parts are discussed. Reduce the phosphorus content of sulfur helps to improve its crack toughness. Secondly, the onset toughness of the crack is discussed and it can be concluded that the reduction of impurities can improve the fracture toughness and restrain the ductile fracture of 9% Ni steel. Direct quenched and tempered steel has the same fracture toughness as ordinary quenched and tempered steel, and concluded that 9% Ni steel, which is directly tempered, is suitable for manufacturing liquefied natural gas storage tanks.