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Production method of excellent thick high-strength steel plate to brittle fracture propagation stop characteristics and high heat input welding heat affected zone toughness, and, thick high-strength steel sheet excellent in brittle fracture propagation stop characteristics and high heat input welding heat affected zone toughness
Production method of excellent thick high-strength steel plate to brittle fracture propagation stop characteristics and high heat input welding heat affected zone toughness, and, thick high-strength steel sheet excellent in brittle fracture propagation stop characteristics and high heat input welding heat affected zone toughness
PROBLEM TO BE SOLVED: To provide a method for producing a thick high strength steel plate having good brittle fracture spreading resistant characteristic and toughness at high heat input welding thermal affected part, and the thick high strength steel plate obtained with this method.;SOLUTION: The production method is as the followings, that is, a continuously cast slab having the regulated component composition and a remained oxygen content OTi deoxidized with Ti as a weak deoxidizing element, remained after deoxidizing with strong deoxidizing element, an effective B content:Bef applied to a solid-solution in austenitic base before transformation and a regulated carbon equivalent Ceq with respective relational formula, is cooled to Ar3-200C after continuously casting and thereafter, reheated to 950-1100C and successively, a rougher-rolling is performed at 900C to 30% cumulative rolling-reduction ratio and a finish-rolling is performed at 700C to 50% cumulative rolling-reduction ratio under condition of showing formula: {-0.5slab heating temperature(C)+1325}(C) to both of the finish-rolling starting temperature and the finish-rolling finishing temperature, and successively, the cooling is performed to 500C by applying an accelerated cooling.;COPYRIGHT: (C)2008,JPO&INPIT
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机译：解决的问题：提供一种在高热输入焊接热影响部处具有良好的耐脆性断裂扩展特性和韧性的高强度厚钢板的制造方法，以及通过该方法获得的高强度厚钢板。其制造方法如下，即，在构成成分受到限制的情况下，以Ti作为弱脱氧元素进行脱氧而残留的氧含量为O Ti 的连铸板坯，在通过强脱氧元素进行脱氧后残留。 ，有效的B含量：在转变之前施加到奥氏体碱中的固溶体的Bef和具有相应关系式的调节碳当量Ceq，在连续铸造后冷却至Ar 3 -200C，然后再加热至950-1100℃，随后在900℃下进行粗轧至30％的累积轧制率，并在700℃下进行精轧至50％的累积轧制率。在表示公式：{-0.5板坯加热温度（C）+1325}（C）至精轧开始温度和精轧结束温度两者的条件下的轧下率，然后冷却至通过加速冷却达到500C 。;版权所有：（C）2008，日本特许厅＆INPIT
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