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Weather-proof structural steel S355K2W thick plate and production method

A technology of S355K2W and weather-resistant structural steel, which is applied in the direction of improving process efficiency, can solve the problems of increasing production cost and increasing production cycle, and achieve the effects of reducing production energy consumption, simplifying production process and reducing production cost

Inactive Publication Date: 2014-04-02
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Claims
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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 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

Method used

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  • Weather-proof structural steel S355K2W thick plate and production method

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Embodiment Construction

[0026] The invention adopts the methods of converter smelting, continuous casting and pouring, and rolling in a 3800m wide and thick plate rolling mill to produce S355K2W weather-resistant structural steel plates. Its technological process is: high-quality molten iron, KR molten iron pretreatment, 100 / 120 ton top-bottom combined blowing converter, LF furnace refining, vacuum degassing treatment, billet stack cooling for 24-60 hours, pusher type heating furnace, 3800m rolling mill, ACC laminar cooling, 11-roll hot straightening machine, stack cooling, finishing, external inspection, flaw detection, storage.

[0027] The implementation is as follows:

[0028] Composition design: On the basis of the composition of traditional S355K2W weather-resistant structural steel, the content and proportion of C, Mn, and Nb alloy elements in S355K2W are appropriately adjusted, and the content of P and S is strictly controlled through clean steel smelting, and strict TMCP rolling is carried o...

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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...

Claims

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Application Information

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IPC IPC(8): C22C38/28C22C38/26C22C38/24C22C38/20C21D8/02
CPCY02P10/20
Inventor 朱书成袁永旗许少普李忠波崔冠军唐郑磊康文举
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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