Steel used for voltage stabilizer of pressurized water reactor power station and manufacture method of steel

Abstract

The invention provides steel used for a voltage stabilizer of a pressurized water reactor power station and a manufacture method of the steel. The steel comprises the following components: 0.10 to 0.25% of C, 0.15 to 0.35% of Si, 0.80 to 0.95% of Mn, not greater than 0.010% of P, not greater than 0.010% of S, 0.50 to 0.80% of Ni, 0.20 to 0.60% of Cr, 0.005 to 0.040% of Al, 0.40 to 0.70% of Mo, 0.005 to 0.01% of V, 0.005 to 0.01% of Ti, not greater than 0.10% of Cu, and the balance of Fe. The method comprises the following steps of: 1) smelting, namely, performing continuous casting on a 70mm steel plate through a converter, and performing die casing on the steel plate of not being less than 70mm; 2) rolling, namely, heating a continuously-casted steel billet to reach the temperature of 1,150 to 1,250 DEG C; controlling the temperature of final rolling in a recrystallization area to not less than 1,000 DEG C; controlling the temperature of rolling in a non-recrystallization area to 830 to 880 DEG C; controlling the total rolling reduction to more than 70%; heating a die-casted steel ingot in a chamber furnace, wherein the temperature in heating is not less than 1,200 DEG C, and the temperature in rolling starting is not less than 1,050 DEG C; and 3) hardening and tempering, namely, quenching at temperature of 850 to 930 DEG C, and maintaining the temperature for 2 to 4min / mm; tempering at 630 to 680 DEG C, and maintaining the temperature for 4 to 10min / mm. The steel product can meet various index requirements.

Description

technical field [0001] The invention belongs to the technical field of ferrous metal materials, and in particular relates to steel for a pressure stabilizer of a pressurized water reactor nuclear power plant and a manufacturing method thereof. Background technique [0002] The application of nuclear power has gone through nearly half a century. Facts have proved that in addition to optimizing the energy structure and creating huge economic benefits, the application of nuclear power plays a more important role in reducing environmental pollution caused by fossil fuels, which is in line with my country's sustainable development. major strategic requirements. Considering that nuclear power is a safe, clean, economical and reliable energy source, many developed countries and some developing countries and regions have given priority to the development of nuclear power. Nuclear power technology has also developed to the third-generation nuclear power technology represented by EPR ...

AI Technical Summary

Problems solved by technology

However, after simulated post-weld heat treatment, both the yield strength and tensile strength of the steel plate will decrease by 20-30 N / mm 2 , indicating that its tensile strength cannot meet the index requirements; at 350°C, the yield strength and tensile strength of the steel plate drop significantly, which cannot meet the needs of the construction of the main equipment of the pressurized water reactor nuclear island

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