HPS420WZ35 weather-resistant bridge plate with thickness of 100mm and production method for ensuring performance of HPS420WZ35 weather-resistant bridge plate

Abstract

The invention discloses an HPS420WZ35 weather-resistant bridge plate with the thickness of 100 mm and a production method for ensuring the performance of the HPS420WZ35 weather-resistant bridge plate, the HPS420WZ35 weather-resistant bridge plate comprises the following chemical components of C, Si, Mn, P, S, Als, Nb, Cr, Mo, V, Ni, Cu, Ti, B, Sn, N and the balance Fe and residual elements, and the production method is achieved through the following steps of blank selection, steel billet treatment, steel billet heating, steel billet rolling, steel plate controlled cooling, steel plate straightening and steel plate slow cooling. In the aspect of component design, segregation is favorably reduced and the welding performance is improved by controlling the contents of strengthening elements such as C and Mn; and by adding alloy elements such as Mo and Cr, the through quenching capacity of the 100 mm extra-thick plate in the cooling process is improved, a fine and uniform B structure can be obtained easily, and the strength is improved. The HPS420WZ35 weather-resistant bridge plate with the thickness of 100mm is fine and uniform B + F + P three-phase structure, the strength and the low-temperature impact toughness are matched, and the comprehensive performance is excellent.

Description

technical field [0001] The invention belongs to the field of wide and thick plate production, and in particular relates to a 100mm thick HPS420WZ35 weather-resistant bridge plate and a production method for ensuring performance thereof. Background technique [0002] With the rapid development of structural steel for bridges and the construction needs of cross-sea steel bridges, the use environment is becoming more and more harsh, requiring good welding performance, good atmospheric corrosion resistance and excellent low-temperature toughness and strength-toughness matching. While improving the strength and thickness of steel, it is also hoped to develop a steel plate that can satisfy high strength and toughness while having good weldability. Contents of the invention [0003] Aiming at the above problems, the present invention has obtained a 100mm thick HPS420WZ35 weather-resistant bridge plate after many tests. It adopts special composition design and controlled rolling a...

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Problems solved by technology

[0003] In view of the above problems, the present invention has obtained a 100mm thick HPS420WZ35 weather-resistant bridge plate after many tests. It adopts special composition design and controlled rolling and controlled cooling process, and focuses on solving the problem that the performance of extra-thick high-strength plate TMCP is difficult to maintain.

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