355MPa-grade high-carbon normalized marine steel for high heat input welding based on BN design

The invention discloses 355MPa-grade high-carbon normalizing marine steel for large heat input welding based on BN design, and relates to the technical field of special steel with special requirements for welding heat input, and the marine steel comprises the following chemical components in percent...

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Bibliographische Detailangaben
Hauptverfasser: ZHANG ZHENHUI, SHI ZHONGRAN, ZHU YING
Format: Patent
Sprache:chi ; eng
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Zusammenfassung:The invention discloses 355MPa-grade high-carbon normalizing marine steel for large heat input welding based on BN design, and relates to the technical field of special steel with special requirements for welding heat input, and the marine steel comprises the following chemical components in percentage by mass: 0.12-0.15% of C, 0.10-0.25% of Si, 1.0-2.0% of Mn, 0.005-0.015% of Ti, 0.05-0.10% of V, greater than or equal to 0.015% of Als, 0.009-0.015% of N, 0.0010-0.0015% of B, and the balance of Fe and inevitable impurity elements. The structure characteristic of a heat affected zone of the maritime work steel is composed of acicular ferrite, grain boundary ferrite, granular bainite and martensite and austenite components, the acicular ferrite structure content is larger than or equal to 60%, the martensite and austenite components are smaller than or equal to 4%, the maritime work steel adapts to 100-600 kJ/cm welding heat input, the impact energy at the low temperature of-40 DEG C is larger than or equal to