许多石油和天然气中都含有H2S,因此油气输送用管线钢应具备抗氢致裂纹(HIC)的性能.综述了化学成分、夹杂物及微观组织对管线钢氢致裂纹影响的最新研究进展.控制管线钢中C≤0.06%,Mn≤1.4%,同时使杂质元素P≤0.015%、S≤0.002%、O≤10 μg/g、H≤2.0 μg/g,并控制Ca为10~ 35 μg/g,从而减少长条状MnS夹杂、链状氧化铝B类夹杂及Mn、P偏析区,有助于提高管线钢HIC抗力.小尺寸及形态圆润无尖角夹杂周围不易形成HIC.管线钢采用针状铁素体组织,同时减少带状组织及MA岛数量及尺寸,可以在保证优异的强韧性同时,满足抗HIC性能要求.
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