Low-carbon-equivalent steel plate for nuclear containment as well as production method of steel plate

Abstract

The invention discloses a low-carbon-equivalent steel plate for a nuclear containment as well as a production method of the steel plate. The steel plate comprises the following chemical components inpercentage by mass: 0.09 to 0.13 percent of C, 0.25 to 0.40 percent of Si, 1.00 to 1.35 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 0.15 to 0.30percent of Cr, 0.15 to 0.35 percent of Ni, 0.15 to 0.25 percent of Mo, less than or equal to 0.10 percent of Cu, 0.020 to 0.040 percent of Nb, less than or equal to 0.10 percent of V, more than or equal to 0.020 percent of Alt, and the balance of Fe and unavoidable impurities, wherein the carbon equivalent CEV is less than or equal to 0.42 percent. The production method comprises the processes ofsmelting, heating a steel billet, rolling the steel billet and performing heat treatment on the steel plate. The steel plate can meet and simulate the normal-temperature stretching, high-temperature stretching and low-temperature impact properties of the delivery state and the heat treatment state after welding simultaneously, and can be widely applied to nuclear power projects at home and aboard.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a steel plate for a low-carbon equivalent nuclear containment vessel and a production method thereof. Background technique [0002] The nuclear containment is the landmark building of the nuclear power plant, and all the equipment of the nuclear steam supply system are installed in it. Nuclear containment is the protector of nuclear power plants. The safety and reliability requirements of the inner steel plate are very strict, requiring high yield strength and tensile strength; good low temperature toughness; good high temperature resistance; in addition, steel plates for nuclear containment It needs to be welded after deformation, so good weldability and cold and hot processing performance are also very important. [0003] With the rapid rise of my country's nuclear power plants, the design of nuclear power plants is becoming more and more stringent, and the requ...

AI Technical Summary

Problems solved by technology

A lower composition design is a necessary condition to ensure good weldability of the steel plate, but it will inevitably reduce the mechanical properties of the steel plate, especially the performance after simulated post-weld heat treatment is more difficult to guarantee

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