S355G10 SUPER-THICK STEEL PLATE FOR OCEAN ENGINEERING AND MANUFACTURING METHOD

摘要

The present invention relates to the technical field of metallurgy. Disclosed is an S355G10 super-thick steel plate for ocean engineering, comprising the following chemical components in percentage by mass: C: 0.04% to 0.08%, Mn: 1.40%-1.60%, Si: 0.10%-0.30%, P≤0.013%; S≤0.003%, Nb: 0.015%-0.030%, Ti: 0.010%-0.020%, Alt: 0.020%-0.055%, Cr: 0.10%-0.20%, Ni: 0.30%-0.50%, CEV≤0.38%, Pcm≤0.18%, and the balance being Fe and impurities. In the present invention, low-carbon composition design, low-compression ratio rolling of a continuous casting blank, a tempering heat treatment process and the like are adopted, so that the S355G10 super-thick steel plate of 120 mm for ocean engineering can be developed.