Method for producing tube blank steel for nuclear electricity

Abstract

The invention provides a production method of WB36CN1 tube blank steel used for nuclear power, particularly comprising: smelting by a converter, refining by an LF refining furnace, casting by a round billet continuous caster, surface examination to a casting billet, surface sand blasting to the casting billet, electroslag remelting ingot and ingot slow cooling, and chemical constituents of the made tube blank steel comprise, in weight percent: 0.08 percent<=C<=0.19 percent, 0.21 percent<=Si<=0.54 percent, 0.75 percent<=Mn<=1.25 percent, 0<P<=0.020 percent, 0<S<=0.006 percent, 0.14 percent<=Cr<=0.35 percent, 0.95 percent<=Ni<=1.35 percent, 0.45 percent<=Cu<= 0.85 percent, 0.20 percent<=Mo<=0.45 percent, 0.010 percent<=Nb<=0.030 percent, 0<N<=0.021 percent, 0<Al<=0.055 percent, balance Fe, and the finished products of tube blank steel have high degree of purity and stable performance.

Description

Production method of billet steel for nuclear power technical field The invention relates to a production method of tube blank steel, in particular to a production method of WB36CN1 tube blank steel for nuclear power. Background technique At present, my country's electric power industry is in a period of rapid development. According to the requirements of sustainable development of national energy, atomic power generation will be one of the key directions of future energy development due to its advantages of high efficiency, economy and cleanliness. The construction of nuclear power plants is on the rise. The nuclear power materials used in my country's nuclear power plants basically rely on imports, so the localization of nuclear power materials is increasingly urgent. If my country's nuclear power materials cannot be localized, the construction of nuclear power plants will always be subject to developed countries, which will seriously restrict the development of my countr...

AI Technical Summary

Problems solved by technology

The selected raw materials are high-quality steel scrap, forging material head, and pig iron, and the ratio is 5:3:2. However, the harmful elements such as As, Sn, Pb, and Sb in the raw material scrap steel are relatively high, and it is difficult to remove them during the smelting process.

The molten steel of cast steel ingots is easily polluted by the refractory materials of the central column tube and soup brick, forming large non-metallic inclusions, and the cooling of the steel ingot is naturally cooled by air, and the solidification of the molten steel is gradually carried out from the outside of the steel ingot to the inside. According to Based on the principle of liquid steel separation and crystallization, the inclusions with low melting point are finally solidified, so that a large number of non-metallic inclusions in the steel gather in the middle and upper parts of the ingot, which greatly reduces the purity of the steel.

To sum up, nuclear power materials have high requirements on steel purity and performance stability. At present, domestic materials cannot meet such standards, so they cannot be widely used in the field of nuclear power.