Steel for gate of extra-thick nuclear reactor containment, and manufacturing method thereof

Abstract

The invention provides steel for a gate of extra-thick nuclear reactor containment, and a manufacturing method thereof. The components of a steel plate include, by weight percentage, 0.08-0.15% of C,0.25-0.50% of Si, 0.90-1.50% of Mn, P <= 0.01%, S which is less than or equal to 0.005%, 0.30-0.60% of Ni, 0.10-0.30% of Cr, 0.10-0.30% of Mo, 0.01-0.05% of V, 0.01-0.05% of Nb, 0.01-0.03% of Al, andNb and V which are less than or equal to 0.08%, with the balance being Fe and inevitable impurities. The manufacturing method includes steel ingot cogging, intermediate billet rolling and heat treatment. The steel plate can be guaranteed to have high intensity while having uniform and stable low-temperature toughness, and the steel plate can still have good comprehensive properties after simulatedwelding and heat treatment.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to an extra-thick steel for nuclear reactor containment gates and a manufacturing method thereof. Background technique [0002] Personnel and equipment gates are the largest auxiliary structural components on the containment of nuclear power plants. They are composed of heads, simplifications, flanges, steel platforms, etc. There are usually two, located at the lower part of the containment, mainly for personnel and large equipment. Transport into and out of the reactor building to provide access. The gate is designed, manufactured and inspected in accordance with "HAF003 Nuclear Power Plant Quality Assurance Safety Regulations", "HAF102 Nuclear Power Plant Design Safety Regulations", "CC-M Pressurized Water Reactor Nuclear Island Mechanical Equipment and Construction Rules", and the maximum thickness is 130mm. As a part of the containment shell, it is safety level 2,...

AI Technical Summary

Problems solved by technology

[0007] The patent "A Production Method for Extra-Thick Steel Plate" (application number: 200910187778.7) is produced by continuous casting slabs with a thickness of 300 mm. The disadvantage is that if a steel plate with a thickness of 130 mm is rolled, the compression ratio is less than 3:1, which does not meet the ASME standard. The compression ratio requirements for nuclear power steel produced by continuous casting slabs. In addition, the strength of the produced steel plates cannot meet the requirements for steel for containment gates.

Images