A low-induced high-wear and corrosion-resistant alloy for nuclear power plants and its preparation method and application

Abstract

The invention discloses a low-induced high wear-resistant and corrosion-resistant alloy for nuclear power plants and its preparation method and application. The chemical composition mass fraction of the low-induced radioactive wear-resistant alloy is C: 1.1-1.35%, Si: 2.0-4.0%, Mn: 4.0-5.0%, Cr: 23.0-26.0%, Ni: 3.50-4.50%, Mo: 1.5-3.5%, Ti: 0.05-0.9%, W: 0.5%-3.5%, V: 0.05-0.5%, Nb: 0.05~1.75%, rare earth elements <0.5%, N<0.10%, Co: <0.05%, B<0.02%, P<0.035%, S<0.035%, and the rest are Fe and unavoidable impurities. The alloy of the invention has good mechanical properties, corrosion resistance and wear resistance between room temperature and 300 DEG C, and can be used to manufacture high-temperature wear-resistant parts of moving parts in nuclear power plants.

Description

technical field [0001] The invention belongs to the technical field of nuclear engineering, and in particular provides a low-induction high-wear and corrosion-resistant alloy for nuclear power plants and a preparation method thereof, which can be used to manufacture wear-resistant parts of nuclear power plant control rod drive mechanisms and nuclear-grade valves and other action parts. Background technique [0002] With the rapid development of the nuclear power industry, the requirement for localization of nuclear power equipment is becoming more and more urgent. In the manufacture of nuclear power products, the wear resistance of the core moving parts is the guarantee of its motion reliability and the key to ensuring the stability of the reactor function. This type of product is under high temperature, high pressure, and corrosion conditions, and the working surface needs to withstand friction and impact, which requires this type of product to have good mechanical properti...

AI Technical Summary

Problems solved by technology

[0003] However, there are two outstanding problems in cobalt-based alloys: one is the wear particles and corrosion debris in cobalt-based alloys. 59 Co (natural abundance 100%) is excited to form 60 Co isotope (with a half-life of 5.27 years) produces induced radioactivity, which will prolong the half-life of nuclear radiation, and the energy of gamma rays emitted is relatively high, which will prolong the maintenance time and threaten maintenance personnel during shutdown maintenance. At the same time, it contains cobalt The wear particles or debris entering the cooling system of the nuclear reactor will also greatly increase the difficulty and cost of nuclear radiation shielding. Moreover, due to the strong radioactivity of the activated cobalt, it will increase the difficulty of reprocessing after decommissioning

Second, my country is a country that lacks cobalt resources, and the cobalt ore reserves are less than 2% of the world's reserves. The cobalt resources needed mainly depend on the import of cobalt concentrates and recycling of cobalt-containing waste, and the cost is relatively high.

The disadvantage is that the controllability of the process is weak, the surfacing layer is prone to cracks, holes and other defects during the cobalt-based alloy surfacing, the hardness and dimensional accuracy of the surfacing layer are difficult to control, and the surfacing layer is easy to peel off during long-term service