Thick steel plate with great line energy and low welding crack sensitivity and its production process
A technology with low welding cracks and large input energy, which is applied in the field of welded structural steel and high-strength steel with high input energy and low welding crack sensitivity. It can solve the problems of low steel plate strength, achieve good performance, simple production process, and low welding Effect of Crack Sensitivity
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[0052] The chemical composition of the steel of the present invention is (by weight percentage), C: 0.6~0.10%, Si: 0.15~0.40%, Mn: 1.20~1.60%, P: ≤0.015%, S: ≤0.007%, Ni: 0.15~ 0.40%, Cr: ≤0.30%, Mo: 0.15-0.30%, V: 0.02-0.06%, and the balance is Fe and unavoidable impurities. In addition, the steel chemical composition of the present invention must also meet:
[0053] Pcm=C+Si / 30+Ni / 60+(Mn+Cr+Cu) / 20+Mo / 15+V / 10+5B≤0.20%;
[0054] In the specific implementation of the present invention, the content of the following elements is adjusted, C: 0.06% to 0.08%, Si: 0.15% to 0.30%, Mn: 1.40% to 1.55%, Ni: 0.20% to 0.30%, Mo: 0.20% to 0.30%, Als: 0.015% to 0.045%, Ti: 0.010% to 0.025%, Nb: 0.015% to 0.030%. The thickness of the finished steel plate produced is ≤20.0mm.
[0055] In the implementation of the present invention, the following element contents are adjusted, C: 0.08%~0.10%, Si: 0.15%~0.30%, Mn: 1.25%~1.45%, Ni: 0.25%~0.40%, Mo: 0.15%~ 0.25%, Als: 0.015% to 0.045%, Ti: 0.0...
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