Nuclear power station reactor core cooling system safety injection box composite steel plate and manufacturing method thereof

Abstract

The invention discloses a nuclear power station reactor core cooling system safety injection box composite steel plate and a manufacturing method thereof. The steel plate is composed of carbon steel of tempered sorbite organization and 304L austenitic stainless steel. The steel billets are symmetrically compounded, an upper layer and a lower layer are carbon steel, two layers in the middle are stainless steel, and an isolating agent is added between the two layers of the stainless steel. The vacuum degree of a composite billet is 1.0-5.0 x 10<-2>Pa. A heating temperature is 1200-1250 DEG C, heating time is 10-15 hours, a single-pass pressing rate is 5%-15%, and the final rolling temperature is larger than or equal to 1000 DEG C. The quenching temperature is 890-920 DEG C, the heat preservation time is 2-3 min/mm, the temperature rising rate is 1.0-1.5min/mm, and water is cooled to be less than or equal to 100 DEG C after being discharged from a furnace. The tempering temperature is 630-660 DEG C, the heat preservation time is 4-6 min/mm, and the temperature rising rate is 1.5-2.0 min/mm. According to the manufacturing method, the produced steel plate has high normal temperature andhigh temperature performance, good shearing strength and bonding strength, and meets requirements for the steel usage by the nuclear station.

Description

Technical field [0001] The invention belongs to the technical field of metal composite plate production, and particularly relates to a composite steel plate for nuclear power and a manufacturing method thereof. Background technique [0002] Heterogeneous composite steel plates are materials for key equipment such as nuclear island regulators and safety injection boxes. Due to the particularity of their application environment, it is necessary to ensure that they have both high mechanical properties and good corrosion resistance. The manufacturing method of the equipment is: surfacing a layer of stainless steel outside the carbon steel that plays a role of strength, and relying on the thickness of the surfacing to maintain the quality of the stainless steel, but the production cycle of this manufacturing method is long and the uneven heat of the surfacing process will cause the equipment Severe deformation; another manufacturing method is currently using explosive composite techno...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a composite steel plate for the safety injection tank of the core cooling system of a nuclear power plant and its manufacturing method. It is designed in terms of composite plate blanks, and combined with suitable heating, rolling and heat treatment processes, it solves the problem of composite plate shearing. The problem of relatively poor shear strength, bonding ratio and plate shape after heat treatment, at the same time shortens the quenching and tempering heat treatment cycle of steel plates and reduces production costs

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