本发明属于低合金高强度钢技术领域，特别涉及一种耐大线能量焊接高强度厚钢板的制造方法。钢板化学成分包括C、Si、Mn、Nb、V、Ti、P、S、Cu、Ni、Mo、B、N、O、Al以及Mg、Ca、Zr、REM中的一种，余量为Fe，并包括特殊的Ti‑M‑O夹杂物分布；钢板制造步骤包括，采用LD‑LF‑RH冶炼流程，转炉钢水硅锰预脱氧，LF精炼脱硫，RH真空脱气，RH炉中向钢水吹氧，并加入Ti和Mg、Ca、Zr或REM脱氧；采用两阶段控制轧制和控制冷却。本发明钢板屈服强度达到500～700MPa，在100～200kJ/cm焊接线能量下具有良好的低温冲击韧性。

The invention belongs to the technical field of low-alloy high-strength steel, and particularly relates to a manufacture method of a high-strength thick steel plate capable of resisting large heat input welding. Chemical components of the steel plate include C, Si, Mn, Nb, V, Ti, P, S, Cu, Ni, Mo, B, N, O, Al, one of Mg, Ca, Zr and REM and the balance Fe, and special Ti-M-O inclusion distributionis also included. The manufacture steps of the steel plate include the steps that silicomanganese pre-deoxidization is conducted on molten steel through the LD-LF-RH smelting process and a converter,LF refining desulfurization is conducted, RH vacuum degassing is conducted, oxygen is blown to the molten steel in an RH furnace, and Ti and Mg, Ca, Zr or REM is added for deoxidization; and two-stagecontrolled rolling and controlled cooling are adopted. The yield strength of the steel plate reaches 500-700 MPa, and the steel plate has good low-temperature impact tenacity under the welding heat input being 100-200 kJ/cm.