Austenitic stainless steel plate for fast neutron reactor and manufacturing method of austenitic stainless steel plate

Abstract

The invention provides an austenitic stainless steel plate steel plate for a fast neutron reactor and a manufacturing method of the austenitic stainless steel plate. The steel plate comprises the following components in percentage by weight: 0.04 to 0.10 percent of C, 0.10 to 0.60 percent of Si, 1.00 to 2.0 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.010 percent of S, 11.50 to 12.50 percent of Ni, 17.00 to 18.00 percent of Cr, 2.50 to 2.70 percent of Mo, less than or equal to 0.10 percent of Cu, 0.05 to 0.15 percent of N, less than or equal to 0.0015 percent of B, less than or equal to 0.03 percent of Al, less than or equal to 0.002 percent of Sb, less than or equal to 0.001 percent of Pb, less than or equal to 0.015 percent of Se, less than or equal to 0.005 percent of Sn, less than or equal to 0.10 percent of V, less than or equal to 0.01 percent of Zn, less than or equal to 0.01 percent of As, less than or equal to 0.06 percent of Co, less than or equal to 0.015 percent of Zr, less than or equal to 1.50 percent of of Nb,less than or equal to 1.00 percent of of Ti,less than or equal to 30ppm of [O],less than or equal to 5.0ppm of [H], and the balance of Fe and inevitable impurities. By adding a certain content of nitrogen element, the normal-temperature and high-temperature strength of austenitic stainless steel is greatly improved; and meanwhile, the ferrite content in the finished steel plate is smaller than 1%, and the steel plate has the uniform grain size, the grain size reaches the level 3-6, and meanwhile the steel plate has the excellent intergranular corrosion resistance.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to an austenitic stainless steel plate for fast neutron reactors and a manufacturing method thereof. Background technique [0002] Fast neutron reactor (referred to as fast reactor) is the only realistic breeder reactor today, and it is the key reactor type to ensure the large-scale development of nuclear power in the country and the sustainable and safe supply of future energy. The materials used to manufacture fast reactors are mainly Austenitic Body stainless steel. Since the operating temperature range of fast reactors is 250-650°C, it is required that the austenitic stainless steels serving at this temperature have good high-temperature strength. Increasing the carbon content in the steel can effectively improve the high temperature strength of the steel plate, but too high carbon content will reduce the intergranular corrosion resistance of the steel plate, especially after the...

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Problems solved by technology

[0003] The patent document "A method for controlling the uniformity of grain size of hot-rolled high-carbon austenitic stainless steel" (application number: 201911126633.6) discloses a three-stage heat treatment method, respectively at 900-920°C, 1000-1010°C and 1050°C Heat treatment in stages above ℃ to ensure that the difference in grain size at different positions in the thickness direction is ≤ 8 μm, but the patent does not discuss the effect of three-stage heat treatment on the steel plate's intergranular corrosion resistance and residual ferrite content

[0004] The patent document "Grain Size Control Method for High Carbon Austenitic Stainless Steel Plate" (Acceptance No. CN111549276A) discloses a three-stage heat treatment method, the temperatures of which are 600°C, 1010°C and 1050°C respectively. The method not only ensures that the steel plate has uniform grains in the direction of the entire thickness, but also has good intergranular corrosion resistance, but the invention does not involve whether the above heat treatment process is beneficial to the elimination of residual ferrite in the steel

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