Nickel-based alloy valves for environments

Valves made of nickel-based alloy materials can work well on pipeline equipment in fine chemicals.

Nickel-based alloys are metals with high strength and oxidation and corrosion resistance at high temperatures of 650~1000℃. According to their performance, they are divided into nickel-based heat-resistant alloys, nickel-based corrosion-resistant alloys, nickel-based wear-resistant alloys, nickel-based precision alloys, and nickel-based shape memory alloys.

The main elements of nickel-based alloys are chromium, tungsten, molybdenum, cobalt, aluminum, titanium, boron, zirconium, etc. Among them, Cr, Aì, etc. mainly play an antioxidant role, and other elements have the effects of solid solution strengthening, precipitation strengthening, and grain boundary strengthening.

Representative materials of nickel-based alloys are: Incoloy alloy, such as Incoloy800, the main component is; 32Ni-21Cr-T, AI; belongs to heat-resistant alloy; Inconel alloy, such as Inconel600, the main component is; 73Ni-15Cr-TiA1; belongs to heat-resistant alloy; Hastelloy alloy, that is, Hastelloy alloy, such as Hastelloy C276, the main component is; 56Ni-16Cr-16M0-4W; belongs to corrosion-resistant alloy; Monel alloy, that is, Monel alloy, such as Monel 400, the main component is; 65Ni-34Cu; belongs to corrosion-resistant alloy.

Nickel-based alloys were first used in the UK in 1941. This alloy material has both the inherent electrochemical properties of nickel and the excellent corrosion resistance of alloying components. It has high strength, good plasticity and toughness, can be smelted, cast, can be cold and hot deformed and formed, and can be welded, etc., with many good comprehensive properties.

Nickel-based corrosion-resistant alloys are alloys whose main properties are corrosion resistance to liquid media (room temperature, sometimes higher than room temperature). Its nickel content generally does not exceed 70%, and it mainly adds Cu, Cr, MO, W, etc. to adapt to various working media with different chemical properties.

Adding copper improves the corrosion resistance of nickel in reducing media and uniform passivity in aerated high-speed flowing seawater; chromium gives nickel corrosion resistance under oxidizing conditions (such as HNO3, H2CIO4), as well as anti-oxidation and anti-sulfurization capabilities at high temperatures; molybdenum and tungsten significantly improve the corrosion resistance of nickel in reducing acids.

Valves made of nickel-based alloys have multiple properties such as high strength, high-temperature resistance, and corrosion resistance. Nickel-based alloy valves have functions that ordinary valves do not have. They can work in corrosion-resistant media environments such as fine chemicals and metallurgy. They are safer and more reliable, and their service life is longer.

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