Ultra-wide and ultra-thick steel for nuclear-power conventional island equipment and manufacturing method thereof

Abstract

The invention discloses ultra-wide and ultra-thick steel for nuclear-power conventional island equipment and a manufacturing method thereof. The ultra-wide and ultra-thick steel comprises the following components in percent by mass: 0.10%-0.18% of C, 0.15%-0.40% of Si, 0.90%-1.50% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S, 0.10%-0.30% of Ni, 0.15%-0.30% of Cr, 0.01%-0.05% of V, 0.01%-0.05% of Nb, 0.015%-0.04% of Als and the balance of iron and inevitable impurities. The manufacturing method is characterized in that the heating temperature of a continuous-casting blank is 1200-1250 DEG C and the time in a furnace is 4-6 hours; at a stage I, the initial rolling temperature is more than or equal to 1100 DEG C, and the total reduction rate is more than or equalto 60%; at a stage II, the initial rolling temperature is 900-950 DEG C, and the final rolling temperature is 800-850 DEG C; the normalizing temperature is 880-920 DEG C, the insulating time is 1-3min / mm, and after being taken out of the furnace, the continuous-casting blank is naturally cooled. The finished steel plate is 60-100mm in thickness and 4000-5100mm in width and can meet the use conditions of the steel for the nuclear-power conventional island equipment.

Description

technical field [0001] The invention belongs to ferrous metal materials, in particular to an extra-wide and extra-thick nuclear power conventional island equipment steel and a manufacturing method thereof. Background technique [0002] PWR nuclear power plants usually consist of two circuits. The primary loop consists of a nuclear reactor, a pressurizer, a primary side of a steam generator, and a circulating pump; it is sealed in a containment vessel and is called the nuclear island of a nuclear power plant. The secondary circuit is composed of the secondary side of the steam generator, steam turbine, regenerative heating system and feed water pump, which is called the conventional island of the nuclear power plant. Conventional island systems are complex, involving multiple pieces of equipment and using a variety of steel types. Among them, pressure components such as shells, heads, joints, reinforcing plates, flanges, tube sheets, and flat covers used in pressure vessels...

AI Technical Summary

Problems solved by technology

The composition of this invention is simple, and a small amount of Ti is added on the basis of C+Mn, which cannot ensure that the mechanical properties of the rolled steel plate meet the requirements of steel for nuclear power conventional island equipment

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