Thick steel plate with high strength and low welding crack sensitivity and its production process
A technology with low welding cracks and production methods, applied in the direction of temperature control, etc., can solve the problems of unrecorded production, limited steel plate thickness, low steel plate strength, etc., and achieve the effects of simple production process, good performance after welding, and simple design
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[0050] The chemical composition of the steel of the present invention is (by weight percentage), C: 0.06%~0.09%, Si: 0.15%~0.55%, Mn: 1.00%~1.60%, P≤0.015%, S≤0.006%, Ni: 0.15 ~0.40%, Cr≤0.30%, Mo≤0.30%, Cu≤0.30%, V: 0.02~0.06%, Nb: 0.005%~0.05%, Als: 0.010%~0.04%, the balance is Fe and inevitable Mixed up.
[0051] In addition, the chemical composition of the steel of the present invention must also meet:
[0052] Pcm=C+Si / 30+Ni / 60+(Mn+Cr+Cu) / 20+Mo / 15+V / 10+5B≤0.20%;
[0053] Ceq=C+Mn / 6+Si / 24+Ni / 40+Cr / 5+Mo / 4+V / 14≤0.40%.
[0054] The specific scheme of the present invention is that when steel plates below 40mm are produced, C: 0.06% to 0.07%, Si: 0.15% to 0.30%, Mn: 1.20% to 1.50%, P≤0.015%, S≤0.006%, Ni: 0.15~0.25%, Mo: 0.15%~0.25%, Cu: 0.05%~0.15%, V: 0.02%~0.04%, Nb: 0.005%~0.02%, Als: 0.010%~0.040%, the balance is Fe and Inevitable inclusions. The maximum Pcm is 0.187%, and the maximum Ceq is 0.404%.
[0055] The specific scheme of the present invention is to produce 40~75mm st...
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