A rolling method of ultra-wide and extra-thick steel containment nuclear power steel

Abstract

The invention discloses a rolling method of ultra-wide and extra-thick steel containment nuclear power steel. The method selects a blank according to the target steel plate specification, ensures a compression ratio ≥ 3, and ensures the deformation of the steel plate in the thickness direction during the rolling process; Heating the billet at high temperature and matching with suitable process parameters such as soaking time and temperature uniformity can realize the full austenitization of the billet and the homogenization of the alloy composition; the cooling and rolling process technology between passes makes it more difficult for the near-surface metal of the billet to show In the state of deformation, the hardness gradient is obtained from the surface to the core, so that the trend of increasing the deformation of the core is obtained, and the effective rolling penetration effect of the core is obtained. It can successfully roll steel plates with a thickness covering 60-101mm and a width covering 4000-4600mm, and ensure that the performance of the steel plate has excellent strength and toughness matching, and the core performance is well homogeneous along the width direction of the steel plate.

Description

technical field [0001] The invention relates to a steel for nuclear power, in particular to a rolling method for steel for nuclear power in an ultra-wide and extra-thick steel containment vessel. Background technique [0002] In recent years, nuclear power equipment has continued to develop towards large-scale. In order to improve the safety level of nuclear equipment, new requirements have been put forward for the size and specifications of steel. It is used to achieve fewer welds, reduce the cost of nuclear pressure vessels, shorten the manufacturing period and in-service inspection. However, after the size of the steel plate increases, the relevant production process cannot be applied to the new technical requirements. In terms of rolling production technology, it is mainly reflected in the following two points: 1. The width of the steel plate is required to be 4600mm, and the thickness of the steel plate must reach 101mm, which has exceeded The rolling mill equipment ca...

AI Technical Summary

Problems solved by technology

Once the rolling process is unreasonable, it will cause certain damage to the equipment

2. The size and specification of the steel plate are ultra-wide and ultra-thick, which leads to a drop in the rolling force during the rolling process, especially affects the deformation of the core, resulting in insufficient deformation of the core. There is a large difference in the performance of the steel plate in the thickness direction, which does not meet the requirements of customers Proposed technical requirements, poor homogeneity

3. The relevant rolling production technology of ultra-wide and extra-thick plates is immature and cannot reach the level of mass production, and urgently needs to be developed and solved

However, the above two manufacturing methods both solve the production and manufacturing problems of thick plates, and do not mention the rolling manufacturing technology that the thickness of the steel plate is ultra-thick and the width is also ultra-wide

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