Non-quenched-tempered high-strength steel plate resistant to large heat input welding and manufacturing method thereof
A high-heat-input welding and high-strength steel plate technology, which is applied in the field of low-alloy steel, can solve problems such as poor toughness, and achieve stable performance, good economy, and easy process control
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[0024] A non-quenched and tempered high-strength steel plate resistant to large heat input welding provided by the present invention and its manufacturing method will be further described below in conjunction with the examples, but the protection scope of the present invention is not limited in any form. All the improvements, modifications or similar replacements should be included in the protection scope of the present invention.
[0025] The invention provides a non-quenched and tempered high-strength steel plate resistant to large heat input welding. The chemical composition of the steel plate mainly includes Fe, C, Si, Mn, Ni, Nb, V, Ti, Ca, N, O and inevitable impurity, the element mass percentage content satisfies 9.92≤11.9-5.3C-0.91Mn-0.54Ni+0.46Si-0.73Nb+1.76V≤10.68 and 5.4≤C / Nb+Ti / N≤6.9. Exemplary chemical compositions are shown in Table 1, Examples 1-4.
[0026] Table 1 Example of chemical composition of non-quenched and tempered high-strength steel plates resistant...
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