690 MPA-GRADED EASY-TO-WELD CORROSION-RESISTING HIGH-STRENGTH STEEL AND MANUFACTURING METHOD THEREFOR

摘要

690 MPa-graded easy-to-weld corrosion-resisting high-strength steel and a manufacturing method therefor. Components (wt%) of the steel are as follows: C: 0.13%-0.23%; Si: 0.10%-0.60%; Mn: 0.80%-1.90%: P: <0.018%; S: <0.008%; Cr: 0-0.50%; Ni: 0-0.60%; Mo: 0-0.45%; Cu: 0-0.40%; Nb: 0-0.060%; V: 0-0.15%; Ti: 0-0.120%; B: 0-0.0035%; and Al: 0.010%-0.050%. An even and fine troostitic structure is obtained during heat treatment in alloy component design, good mechanical properties and fatigue properties are obtained, welding performance and corrosion resistance are more excellent, and the steel adapts to production and manufacturing in engineering machinery, mining machinery, harbor machinery and other industries.