Cu-contained and Cr-controlled seamless steel tube for nuclear power station and production method for Cu-contained and Cr-controlled seamless steel tube

Abstract

The invention relates to a Cu-contained and Cr-controlled seamless steel tube for a nuclear power station and a production method for the seamless steel tube. The seamless steel tube comprises the following chemical components in weight percentage: 0.10-0.15 percent of C, 0.90-1.20 percent of Mn, 0.20-0.45 percent of Si, not greater than 0.015 percent of P, not greater than 0.005 percent of S, 0.20-0.30 percent of Cr, 0.25-0.40 percent of Mo, 1.10-1.25 percent of Ni, 0.55-0.65 percent of Cu, 0.015-0.025 percent of Nb, not greater than 0.02 percent of Altot, not greater than 0.008 percent of N, not greater than 0.0002 percent of H, not greater than 0.003 percent of O, not greater than 0.012 percent of As and Sn, not greater than 0.020 percent of As, Sn, Pb, Sb and Bi and the balance Fe and inevitable impurities. According to the production method for the seamless steel tube, steel for a round tube blank is treated by adopting an oxygen converter through external refining and vacuum refining, and the round tube blank is produced by adopting a continuous casting method. The invention has the advantages that through adding alloying elements, such as Cu and Cr, the round tube blank with high purity, low gas content and low impurity content is obtained through strictly controlling harmful elements, and moreover, a reasonable reheating schedule, a rolling technology and a heat treating regime are formulated, so that the steel grade has much higher strength than carbon steel and is good in flow accelerated corrosion (FAC) resistance, is capable of saving wall thickness, is safe and reliable and is suitable for the demanding seamless steel tube for the nuclear power station.

Description

technical field [0001] The invention relates to a Cu-containing and Cr-controlled seamless steel pipe for nuclear power plants and a production method thereof, belonging to the field of metallurgical materials. Background technique [0002] With the implementation of the national energy conservation and emission reduction energy policy, efficient, economical and clean atomic energy (nuclear energy) power generation has become one of the key energy sources for national development, and the construction of nuclear power plants has grown rapidly. The structural materials of nuclear reactors work under the conditions of high temperature, strong radiation and corrosion, and the requirements are harsh. The materials should have good mechanical properties, radiation stability, compatibility with nuclear fuel, high thermal conductivity, etc. Containers are not allowed under any circumstances Destruction and spillage. [0003] The main steam pipeline and the main water supply pipeli...

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