Selection and application of metal rings in high temperature environments

In high-temperature environments, metal rings serve as key components for sealing, support or connection, and the selection of their materials is crucial. High-temperature environments not only test the temperature resistance of materials, but also involve factors such as corrosion resistance, mechanical strength and oxidation resistance. This article will explore the material selection and application of metal rings in high temperature environments.

1. Requirements for metal materials in high temperature environments

Temperature resistance

High temperature stability: The material should maintain its physical and chemical properties at high temperatures without significant changes.

High temperature strength: Materials must maintain sufficient mechanical strength at high temperatures to withstand stress and pressure.

Corrosion resistance

Oxidation resistance: The material should have good antioxidant ability at high temperatures to prevent the formation of oxide scales and corrosion layers.

Resistant to corrosive media: The material needs to be able to resist the erosion of various corrosive media in high temperature environments.

Mechanical properties

High temperature toughness: The material should maintain good toughness at high temperatures to prevent brittle fracture.

High-temperature creep resistance: The material needs to resist creep deformation under high temperature for a long time.

2. Commonly used high-temperature metal materials and their characteristics

Stainless steel

Commonly used grades: 304, 316, 321, 347, etc.

Temperature resistance: Generally between -269°C and 800°C, some grades can be used at higher temperatures.

Corrosion resistance: It has good corrosion resistance, especially stainless steel 316, which performs well in high-temperature chloride environments.

Mechanical properties: Maintain good mechanical strength and toughness at high temperatures.

Nickel-based alloy

Commonly used grades: Inconel 600, Inconel 625, Hastelloy, Monel, etc.

Temperature resistance: generally between -269°C and 1100°C.

Corrosion Resistance: Excellent corrosion resistance, especially in acidic, chloride and high temperature oxidizing environments.

Mechanical properties: Maintains excellent mechanical strength and creep resistance at high temperatures.

Cobalt based alloy

Commonly used grades: Stellite series.

Temperature resistance: generally between -42°C and 1100°C.

Corrosion resistance: Excellent wear resistance and corrosion resistance, especially suitable for high temperature and high pressure environments.

Mechanical properties: Excellent wear resistance and creep resistance at high temperatures.

Titanium and titanium alloys

Commonly used grades: pure titanium, Ti6Al4V, etc.

Temperature resistance: generally between -269°C and 600°C.

Corrosion resistance: Excellent corrosion resistance, especially resistance to chloride corrosion.

Mechanical properties: Maintain good mechanical strength and toughness at high temperatures.

3. Specific applications of metal rings in high temperature environments

Aerospace

Engine sealing ring: using nickel-based alloy and cobalt-based alloy, requiring high temperature resistance and corrosion resistance.

Turbine blades: Use titanium and titanium alloys, which require mechanical strength and corrosion resistance at high temperatures.

Chemical and petrochemical

High temperature valve seals: Use Inconel 625, which requires corrosion resistance and mechanical strength at high temperatures.

High-temperature reactor sealing ring: stainless steel 316 is used, which requires chemical corrosion resistance and high-temperature stability.

Energy and power generation

Gas turbine seals: Using Inconel 600, corrosion resistance and mechanical strength at high temperatures are required.

Nuclear reactor sealing ring: Using Hastelloy requires corrosion resistance and radiation resistance in high temperature and high pressure environments.

4. Processing and handling of metal rings

Material selection and proportioning

Precise proportioning: According to the specific application environment, select appropriate metal materials and proportions to ensure optimal performance.

Pretreatment: Pretreatment of metal materials, such as heat treatment, surface treatment, etc., to improve their high temperature performance.

Forming and processing

Thermoforming: Forming at high temperatures ensures the shape and dimensional accuracy of the metal ring.

Surface treatment: Anti-oxidation and corrosion-resistant treatment to improve the stability of the metal ring in high temperature environments.

Quality inspection

High temperature test: Perform performance testing at actual operating temperature to verify the temperature resistance and corrosion resistance of the metal ring.

Mechanical performance testing: Conduct tensile, compression, creep and other tests to ensure the mechanical properties of the metal ring at high temperatures.

in conclusion

In a high-temperature environment, the material selection of the metal ring needs to comprehensively consider factors such as temperature resistance, corrosion resistance, and mechanical properties. Materials such as stainless steel, nickel-based alloys, cobalt-based alloys, titanium and titanium alloys show their respective superior properties in different high-temperature application scenarios. Through precise material selection, processing technology and quality inspection, the long-term stable operation of metal rings in high temperature environments can be ensured and meet various high-demand industrial applications.

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