Inconel690

Inconel 690 is the earliest alloy in the Inconel system, it has good resistance to high temperature corrosion, oxidation resistance, hot and cold working properties and low temperature mechanical properties, with high strength at 650 ℃, the alloy can be strengthened by cold working, good forming properties, similar to low-alloy steel, and easy to weld. High corrosion resistance to various exhaust alkaline solutions and most organic acids and compounds. Not susceptible to corrosion cracking from chloride ions. However, it is susceptible to stress corrosion cracking under high concentration of caustic alkali or high temperature mercury conditions.

Inconel 690 alloy has excellent resistance to intergranular corrosion and intergranular stress corrosion cracking, mainly used for steam generator heat transfer tube materials for pressurized water reactor nuclear power plants. Materials for heat transfer tubes for steam generators in pressurized water reactor nuclear power plants have gone through a development process, including 304 austenitic stainless steel, alloy 690, alloy 800 and alloy 690. The corrosion failure study of 690 alloy in service shows that intergranular corrosion and intergranular stress corrosion cracking is the main problem. 690 alloy as a pressurized water reactor nuclear power plant steam generator heat transfer tube material, the use of no breakage has not been found since the report. Inconel690 main features: has excellent corrosion resistance and thermal stability. Inconel690 use: on steam generators for pressurized water reactors Inconel690 in oil recovery engineering equipment working environment. Nickel and nickel alloys are more ideal metal materials for various harsh corrosive environments such as chemical, petroleum, non-ferrous metal smelting, high temperature, high pressure, high concentration or mixed with impurities. As the standard potential of nickel is greater than that of iron, nickel-based corrosion-resistant alloys with excellent corrosion resistance can be obtained. Nickel mechanical properties are good, especially plasticity, excellent tenacity, can adapt to a variety of corrosive environments. Mostly used in food processing equipment, chemical shipping containers, electrical and electronic components, handling caustic alkali equipment, seawater corrosion resistant equipment and heat exchangers, such as valves, pumps, shafts, clamps and fasteners in chemical equipment, also commonly used to make parts of freezers in contact with concentrated CaCl2 solution, and pipes for feedwater heaters in power plants. Inconel690 nickel-based high temperature alloy not only has good high temperature mechanical properties, but also has good corrosion resistance, widely used in petrochemical chemical and aerospace engineering. MANgoo as a nickel-based material 25Cr a 32Ni material improvement, has better creep resistance and higher thermal shock resistance, good elongation after aging performance, in fertilizer plant in a section of the conversion furnace has also been widely used in recent years. The wet air high-pressure oxidation system is the first environmental protection device used to treat waste lye in China. Four months after the system was put into operation, the nickel-based alloy Inconel 690 pipeline showed serious thinning and led to rupture and leakage. After analyzing the cause of the pipe thinning, it was determined that it was mainly due to corrosion. After taking measures such as increasing the waste alkali material filter and cleaning it regularly, enlarging the reactor outlet diameter and replacing the elbow with an elbow, the service life of the above nickel-based alloy pipes was extended several times. The advantageous corrosion of nickel-based alloy 690 was demonstrated.