High-toughness corrosion-resistant steel for ocean engineering and manufacturing method of high-toughness corrosion-resistant steel

• Main Authors: YANG XINWEN, MA YUCHUN, NING BAOQUN, DONG ZHIZHONG, HUANG ZHIXIN, WANG ZHIQI
• Format: Patent
• Language: Chinese; English
• Published: 29.06.2021
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; FORGE FURNACES; FORGING; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; HAMMERING; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PRESSING METAL; PUNCHING METAL; RIVETING; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to high-toughness corrosion-resistant steel for ocean engineering and a manufacturing method of the high-toughness corrosion-resistant steel. The steel plate comprises, 0.20-0.35 of C; 0.70-1.50 of Mn; 0.15-0.80 of Si; 0.70-1.00 of Cr; 0.30-1.20 of Mo; 0.50-1.20 of Ni; less than or equal to 0.005 of P; less than or equal to 0.005 of S; 0.01-0.1 of V; 0.001-0.008 of B; 0.2-1.5 of Cu; 0.01-0.08 of RE; and the balance Fe and inevitable impurities.The tensile strength of the prepared engineering steel is larger than or equal to 800 Mpa, the yield strength is larger than or equal to 750 Mpa, the percentage elongation after fracture is larger than or equal to 18%, the section elongation is larger than or equal to 55%, the impact energy at the temperature of -18 DEG C is larger than or equal to 75 J; and the seawater solution corrosion rate is simulated to be less than or equal to 0.07/mm.a, and the material is not fractured in 720 hours in a hydrogen sulfide stress corrosion resistance test. 本