焊接性及抗疲劳特性优良的700MPa级低温调质钢板及其制造方法

• Format: Patent
• Language: Chinese
• Published: 14.05.2021
• 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

焊接性及抗疲劳特性优良的700MPa级低温调质钢板及其制造方法，其成分重量百分比为：C：0.050～0.090％，Si≤0.15％，Mn：1.30～1.60％，P≤0.013％，S≤0.0030％，Cu：0.10～0.35％，Ni：0.50～0.90％，Cr：0.15～0.35％，Mo：0.15～0.35％，Nb：0.008％～0.030％，V：0.030～0.060％，Ti：0.008～0.014％，Al：0.030～0.060％，B≤0.0003％，N≤0.0050％，Ca：0.0010％～0.0040％，其余为Fe和不可避免夹杂。本发明采用超低C－Mn－(Ti+Nb+V)微合金钢的成分体系作为基础，在获得优良的700MPa级调质钢板强度、超低温韧性及强韧性匹配的同时，钢板的焊接性、机械加工性能也同样优异。 The invention discloses a 700 MPa grade low temperature quenched and tempered steel plate with excellent weldability and fatigue resistance and a manufacturing method thereof. The steel plate comprises the following components in percentage by weight: 0.050-0.090% of C, less than or equal to 0.15% of Si, 1.30-1.60% of Mn, less than or equal to 0.013% of P, less than or equal to 0.0030% of S, 0.10-0.35% of Cu, 0.50-0.90% of Ni, 0.15-0.35% of Cr, 0.15-0.35% of Mo, 0.008-0.030% of Nb, 0.030-0.060% of V, 0.008-0.014% of Ti, 0.030-0.060% of Al, less than or equal to 0.0003% of B, less than or equalto 0.0050 % of N, 0.0010 -0.0040% of Ca, and the balance Fe and