海底管线用钢要求具有较大的均匀塑性变形延伸率、较低的屈强比等,该管线钢的高强度与高塑性匹配主要来源于双相组织的作用.针对海底管线用钢的组织和塑性变形能力进行了研究.结果表明,海底管线用钢的母材组织由铁素体、贝氏体及少量MA岛构成,其组织形貌与控轧控冷工艺密切相关.细化的双相组织具有良好的塑性指标和较低的屈强比,保证了管线钢具有良好的强塑性匹配.
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