High strength steel plate for big thickness tall building structure and production method thereof

Abstract

The invention relates to a steel plate with high intensity and used in construction structures of high buildings with large thickness and a production method thereof. The steel plate of the invention consists of the following components according to weight percentage: less than or equal to 0.20 percent of C, less than or equal to 0.55 percent of Si, 1.00 to 1.70 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.70 percent of Ni, less than or equal to 0.70 percent of Cr, less than or equal to 0.20 percent of V, more than or equal to 0.015 percent of Nb, less than or equal to 0.20 percent of Ti, 0.020 to 0.060 percent of Al, and the rest is Fe and inevitable impurity. The produced Q460E-Z35 steel plate with a thickness of 100 to 110 mm is capable of meeting the requirement of high intensity steel of large-thickness construction structure (Ceq is less than or equal to 0.50 percent); the steel plate of the invention can be applied to constructing the structure of high building, has good performance of welding and anti-layer tearing, can meet the requirement of on-site key stress points, has simple production process and is capable of realizing bulk production. The high intensity steel plate of the invention has the following advantages that (1) the steel quality of the invention is purer with less than or equal to 0.025 percent of P and less than or equal to 0.010 percent of S; (2) yield ratio of the invention is relatively low and less than 0.78 actually; (3) the anti-layer tearing performance is good, and Z is larger than or equal to 35 percent in whole thickness direction; (4) low-temperature toughness at the temperature of minus 40 DEG C is good; (5) maximum thickness of the steel plate can reach 110mm.

Description

technical field [0001] The invention relates to a Q460E-Z35 steel plate for high-rise buildings with a thickness of 100-110 mm, and also relates to a production method of the high-strength steel plate for high-rise building structures with large thickness. Background technique [0002] At present, steel plates with the same or similar performance and grade as high-strength steel plates are used abroad, but they are mostly used in structures such as pressure vessels, offshore platforms, and bridges, and have never been used in China. The application of this kind of steel in China has always relied on foreign imports. It has never been used in the construction field in China. If it relies on imports, it will not only be expensive, but also have a long purchase cycle, which cannot guarantee the normal progress of the project. Moreover, the thickness of steel plates with such properties in foreign countries is up to 89.4 mm; some indicators cannot meet the requirements of high-r...

AI Technical Summary

Problems solved by technology

The application of this kind of steel in China has always relied on foreign imports, and it has never been used in the domestic construction field. If you rely on imports, not only the price is expensive, but also the purchase cycle is long, which cannot guarantee the normal progress of the project.

Moreover, the thickness of the steel plate with this kind of performance in foreign countries is 89.4mm; some indicators cannot meet the requirements of high-rise buildings.