Thick steel plate for high heat input welding and having great heat-affected area toughness and manufacturing method therefor
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[0062]In Comparative Examples 1˜2, the Mg contents in the steel both are less than 0.0005%, and both don't meet the requirements of Mg / Ti≥0.017 and effective S content in the steel of 0.0003 to 0.003%. At the same time, the proportion of composite inclusion MgO+Ti2O3+MnS in the steel plate of Comparative Example 2 does not meet the requirement of 5% or more. In addition, in Comparative Example 1, the Ti / N ratio does not satisfy the requirements of the present invention.
[0063]Table 2 shows the tensile properties, impact toughness, aging impact performance of the base material and impact toughness of the welding heat-affected area in the examples and comparative examples. Yield strength, tensile strength, and section shrinkage of the base material are the average value of two test data. Aging impact and Charpy impact work of welding heat-affected area at −40° C. of the base material are the average value of three test data.
[0064]From the data in the table, it can be seen that there i
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