Low-temperature service environment high-crack-arrest toughness structural steel for ships and ocean engineering and production method thereof

• Main Authors: WANG RUNGANG, YANG JIANXUN, WANG JIE, LI GUOBAO, GONG PIHAI, WANG SHUHUA, ZHOU LANJU, TANG HUASHENG, JIAO GUANGLIANG, ZHENG FEI, LIU CHAO
• Format: Patent
• Language: Chinese; English
• Published: 23.12.2022
• 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 relates to the technical field of steel, in particular to low-temperature service environment high-crack-arrest-toughness structural steel for ships and ocean engineering and a production method of the structural steel. The structural steel comprises 0.03%-0.07% of C, 0.05%-0.17% of Si, 1.90%-3.00% of Mn, 0.01%-0.05% of Nb, 0.005%-0.025% of Ti, 1.00%-2.00% of Ni, 1.00%-2.00% of Cu, 0.10%-0.19% of Cr, 0.0030%-0.0070% of Ce, 0.0030%-0.0070% of Zr, smaller than or equal to 0.018% of Alt, smaller than or equal to 0.010% of P, smaller than or equal to 0.005% of S, smaller than or equal to 40 ppm of N, smaller than or equal to 20 ppm of O, smaller than or equal to 2 ppm of H and the balance Fe and inevitable impurities. According to the invention, the crack arrest toughness of a coarse grain area after steel plate welding in a low-temperature service environment is greatly improved. 本发明涉及钢铁技术领域，具体涉及一种低温服役环境高止裂韧性船舶及海洋工程用结构钢及其生产方法。该结构钢包含C：0.03％～0.07％、Si：0.05％～0.17％、Mn：1.90％～3.00％、Nb：0.01％～0.05％、Ti：0.005