Weather-proof structural steel S355K2W thick plate and production method

Abstract

The invention discloses a 60-120mm improved weather-proof structural steel S355K2W thick plate and a production method thereof. The weather-proof structural steel S355K2W thick plate comprises the following chemical components by mass percent: 0.08-0.15% of C, 0.20-0.45% of Si, 1.20-1.45% of Mn, less than or equal to 0.018% of P, less than or equal to 0.007% of S, 0.015-0.050% of Als, less than or equal to 0.15% of Nb+V+Ti, 0.45-0.70% of Cr, 0.30-0.50% of Cu, and the balance of Fe and residual elements. A technological process of the weather-proof structural steel S355K2W thick plate comprises the steps of high-quality molten iron and KR molten iron pretreatment, a 100/120t top-bottom combined blowing converter, LF (ladle furnace) refining, vacuum degassing treatment, casting blank pile cooling for 24-60h, a pusher type heating furnace, a 3800m rolling mill, ACC (accelerated) laminar cooling, an 11-roll thermal straightener, pile cooling, finishing, external inspection, fault detection and warehousing. The weather-proof structural steel S355K2W thick plate and the production method have the benefits that the performance of the steel plate can reach a requirement of a national standard in a TMCP (thermal mechanical control processing) rolling and steel plate piling slow cooling mode under the condition of constant traditional S355K2W carbon equivalent; a production technology is simplified; a heat treatment process is cancelled; the production energy consumption is reduced; and the production cost is lowered greatly.

Description

technical field [0001] The invention belongs to the field of medium and heavy plate production, and in particular relates to a 60-120mm improved weather-resistant structural steel S355K2W thick plate and a production method thereof. Background technique [0002] S355K2W belongs to the weather-resistant structural steel in the European standard EN10025. It has the characteristics of excellent low-temperature toughness, good processing performance and welding performance, and atmospheric corrosion resistance. In recent years, its application range has expanded and its demand has increased. However, most domestic steel mills are currently producing For S355K2W weathering steel plates with a thickness of 60-120mm, normalizing treatment is required to make the mechanical properties meet the standard requirements, which not only increases the production cycle, but also increases the production cost. Contents of the invention [0003] In view of the above problems, the inventor o...

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Problems solved by technology

[0002] S355K2W belongs to the weather-resistant structural steel in the European standard EN10025. It has the characteristics of excellent low-temperature toughness, good processing performance and welding performance, and atmospheric corrosion resistance. In recent years, its application range has expanded and its demand h

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