Guaranteed crack detection and guaranteed performance Q345B steel plate with thickness of 150mm and production method thereof

• Main Authors: GAO JUN, ZHAO CHAO, ZHANG DAZHI, HUA GUOLONG, YUE YI'NAN, HUANG NAN, WU PENGFEI, LI HAO, WANG HAO, ZHANG XIAOYAN, BAI YONGQIANG, LIU DAN, LU BIN, HUI XIN, SONG LIQUAN, LIU ZETIAN, ZHAO FUSHENG, SUN CHANGYU
• Format: Patent
• Language: Chinese; English
• Published: 03.09.2014
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a guaranteed crack detection and guaranteed performance Q345B steel plate with thickness of 150mm and a production method thereof, the steel plate comprises the following chemical components by weight: 0.16-0.19% of C, 0.25-0.40% of Si, 1.50-1.90% of Mn, greater than or equal to 0.020% of P, greater than or equal to 0.015% of S, 0.020-0.030% of Als, and the balance of Fe and impurity. The invention also discloses a production method of the guaranteed crack detection and guaranteed performance Q345B steel plate with thickness of 150mm. The guaranteed crack detection and guaranteed performance Q345B steel plate with thickness of 150mm has excellent mechanical property, yield strength of steel plates in each embodiment is greater than 345MPa, the tensile strength is more than 500MPa, elongation percentage is greater than 25%, and the impact energy of the steel plate at room temperature can reach more than 150J.