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Excellent thick-walled high-strength steel and a method for manufacturing the weld heat-affected zone CTOD characteristics

机译:优质厚壁高强度钢及其焊接热影响区CTOD特性的制造方法

摘要

Provided are a heavy wall thickness high-strength steel plate with excellent low-temperature toughness (Charpy impact and CTOD properties of a weld bond) in a multilayer weld zone and a method for manufacturing the steel plate. The high-strength steel plate has a chemical composition containing, by mass%, a certain amount of C, Si, Mn, P, S, Al, Cu, Ni, Nb, Ti, N, O, and the like, and the balance being Fe and inevitable impurities, in which Ceq which is defined by relational expression (1) is 0.520% or less, in which Ti/N is 1.50 or more and 4.00 or less, in which a parameter relational expression regarding specified chemical elements for controlling the shape of sulfides in steel and the degree of center segregation is satisfied, and in which the hardness of a center segregation part of the steel plate is specified: Ceq = [C] + [Mn]/6 + ([Cu]+[Ni])/15 + ([Cr] + [Mo] + [V])/5 ... (1).
机译:本发明提供一种在多层焊接区域中具有优异的低温韧性(焊缝的夏比冲击和CTOD特性)的厚壁厚高强度钢板及其制造方法。高强度钢板的化学组成按质量百分比计包含一定量的C,Si,Mn,P,S,Al,Cu,Ni,Nb,Ti,N,O等。余量为Fe和不可避免的杂质,其中由关系式(1)定义的Ceq为0.520%以下,其中Ti / N为1.50以上且4.00以下,其中关于特定化学元素的参数关系式为控制钢中硫化物的形状并满足中心偏析的程度,并指定钢板的中心偏析部分的硬度:Ceq = [C] + [Mn] / 6 +([Cu] + [Ni])/ 15 +([Cr] + [Mo] + [V])/ 5 ...(1)。

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