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The industrial trial production of S420MLO hot-rolled high-strength low temperature resistant H beam for ocean engineering is carried out by Baotou Steel based on the industrial tests. The results showed that the yield strength of test steel was greater than 450 MPa and with certain surplus, its tensile strength was 615~628 MPa, average yield ratio was 0.75, elongation could reach over 26% as well as impact energy at -40 ℃ could meet standard requirement so that it is with excellent strength and toughness. The microstructure of test steel is mainly composed of ferrite and pearlite, the nano precipitated phase in matrix is with length of 100 nm and width of 20~30 nm, which could significantly improve the properties of steel. The S420MLO hot-rolled high-strength low temperature resistant H beam developed is with excellent comprehensive properties, which could provide the solid material support for safe service of such equipment as ocean platforms.

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在中试试验的基础上，包钢进行了海洋工程用S420MLO高强耐低温热轧H型钢工业试制。试制结果表明，试验钢的屈服强度大于450 MPa，且具有一定的富裕量，抗拉强度在615~628 MPa之间，屈强比平均为0.75，延伸率达到26%以上，在-40 ℃条件下的冲击功满足标准要求，表明其具有优异的强韧性。试验钢微观组织主要由铁素体和珠光体构成，基体中存在纳米级的析出相（长度100 nm，宽度20~30 nm），对钢的性能有显著提升作用。开发的S420MLO高强耐低温热轧H型钢综合性能优异，为海洋平台等装备的安全服役提供了坚实的材料支撑。

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刘丽娟（1994-），女，山西省大同市人，硕士，现从事长型材新产品研发和质量攻关工作。

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刘丽娟（1994-），女，山西省大同市人，硕士，现从事长型材新产品研发和质量攻关工作。

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