High-shear-strength super-thick composite steel plate for generation III nuclear power station and manufacturing method of composite steel plate

Abstract

The invention discloses a high-shear-strength super-thick composite steel plate for a generation III nuclear power station and a manufacturing method of the composite steel plate. The composite steelplate consists of steel-plate carbon steel and 304L austenitic stainless steel. The assembly sequence is as the follows from top to bottom: stainless steel, carbon steel, an isolating agent, carbon steel and stainless steel. Edge sealing is carried out on four edges of a combined billet by welding, vacuumizing treatment is carried out, and the vacuum degree is 100 Pa or lower. The heating temperature of the combined billet is 1200-1270 DEG C, the heating time is 10-15 hours, the single-stroke reduction rate is 5%-15%, the final rolling temperature is controlled to be 1050 DEG C or above, tempering heat treatment is carried out after rolling, the quenching temperature is 870-930 DEG C, the heat preservation time is 2-4 min / mm, and the heating rate is 1.0-1.5 min / mm. The tempering temperature is 620-660 DEG C, the heat preservation time is 3-6 min / mm, and the heating rate is 1.5-2.0 min / mm. The thickness of a finished composite steel plate is 29-110 mm, the shearing strength is good, andthe requirement of steel for composite boards of a nuclear power station is met.

Description

technical field [0001] The invention belongs to the technical field of metal composite plate production, and in particular relates to a composite steel plate for nuclear power and a manufacturing method thereof. Background technique [0002] Heterogeneous composite steel plate is a new type of economical material. The heterogeneous composite plate is made of stainless steel and carbon steel combined in a specific way. It has both the mechanical properties of carbon steel and the anti-corrosion properties of stainless steel. Traditional heterogeneous composite panels combine stainless steel and carbon steel by means of explosion. This process currently has many disadvantages. First of all, its production environment is greatly restricted. Generally, the production site needs to be selected in remote mountainous areas. Production and transportation cause greater difficulty; secondly, the large amount of explosives required for the explosion is more harmful to the environment, ...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a third-generation nuclear power plant high-shear strength extra-thick composite steel plate and its manufacturing method. Based on the performance requirements of the third-generation nuclear power plant composite steel plate, it is designed in terms of composite plate blank formation and vacuum degree. Advanced heating, rolling and heat treatment process, so as to ensure that the performance of the steel plate in different states meets the requirements, and solve the problem of low shear strength of extra-thick composite plate, difficult control of plate shape during quenching and tempering heat treatment, low production efficiency and high vacuum degree requirements The production difficulty caused by the problem is that the steel plate is 100% bonded, the shear strength of the steel plate is ≥ 400MPa, the shape of the steel plate is well controlled and the heat treatment cycle is shortened

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