Hot-rolled structural steel ST52 medium-thick plate with thickness of 15-60mm and production method thereof

Abstract

The invention discloses a hot-rolled structural steel ST52 medium-thick plate with the thickness of 15-60mm. The thick plate comprises the following chemical components by weight percent (wt%): 0.10-0.16wt% of C, 0.25-0.45wt% of Si, 1.20-1.50wt% of Mn, less than or equal to 0.017wt% of P, less than or equal to 0.003wt% of S, 0.015-0.055wt% of Als, 0.020-0.040wt% of Nb, 0.010-0.020wt% of Ti and the balance of Fe and residual elements, wherein C equivalent amount [Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15] is less than or equal to 0.41. According to the invention, through KR molten iron pretreatment, converter smelting, argon blowing treatment, LF (ladle furnace) refining, VD (vacuum degassing) refining, continuous casting, heating, controlled rolling and controlled cooling and piling cooling processes and on the basis of ensuring the ST52 components, the contents of harmful elements such as P, S and the like, influencing the plasticity and toughness of the steel plate, in steel are strictly controlled, and simultaneously, the heating system of rolled steel is strictly controlled; and in the rolling process, final rolling temperature, red returning temperature and cooling speed are rigidly controlled, and methods such as steel plate stacking and slow cooling and the like are adopted, the various properties of the ST52 steel plate with the thickness of 15-60mm reach standard requirements.

Description

technical field [0001] The invention belongs to the technical field of medium-thick steel plate production, and in particular relates to a 15-60mm thick hot-rolled structural steel ST52 medium-thick plate and a production method thereof. Background technique [0002] In the known technology, the production of traditional ST52 medium and heavy plates is quite cumbersome, and the quality of the steel products produced is not very good, which has a certain impact on the improvement of competition and income of enterprises. Contents of the invention [0003] Aiming at the above problems, the present invention provides a 15-60mm thick hot-rolled structural steel ST52 plate and a production method thereof which are cost-saving and easy to produce. [0004] A 15-60mm thick hot-rolled structural steel ST52 plate, containing the following chemical composition in mass percentage (unit, wt%): C: 0.10-0.16, Si: 0.25-0.45, Mn: 1.20-1.50, P≤0.017 , S≤0.003, Als: 0.015-0.055, Nb: 0.020-...

AI Technical Summary

Problems solved by technology

[0002] In the known technology, the production of traditional ST52 medium and heavy plates is quite cumbersome, and the quality of the steel produced is not very good, which has a certain impact on the improvement of competition and income of enterprises

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