Inconel 718 seamless steel pipe, as an outstanding representative of nickel-based alloy pipe, has been widely used in aerospace, petrochemical, energy and medical equipment and other fields with its excellent performance. This alloy tube not only shows extraordinary strength and corrosion resistance at high temperatures, but also has excellent processing properties and welding properties, becoming an indispensable important material in modern industry.
Chemical composition: Carbon: ≤0.08, Silicon: ≤0.35, manganese: ≤0.35, sulfur: ≤0.015, Phosphorus: ≤0.015, Chromium: 17.0~21.0, nickel: 50.0~55.0, iron: margin, aluminum: 0.20~0.80, titanium: 0.65~1.15, Copper: ≤0.30, molybdenum: 2.80~3.30, niobium: 4.75~5.50 Boron: ≤0.006,
Physical properties: Density (g/cm3) 8.2, melting point (℃) 1260~1340,
The minimum mechanical properties of the alloy at room temperature; Solution treatment: tensile strength (RmN/mm2) 1275, yield strength (Rp0.2N/mm2) 1034, elongation (As %) :≤30
1, the basic characteristics of Inconel 718 seamless steel pipe
Inconel 718 seamless steel pipe, formally known as N07718 or GH4169, is a precipitation-hardened nickel-iron based superalloy containing niobium and molybdenum. In its chemical composition, the nickel content is as high as 50% to 55%, the chromium content is 17% to 21%, and it also contains an appropriate amount of iron, molybdenum, niobium and a small amount of manganese, carbon, copper and other elements. This unique composition gives Inconel 718 seamless steel pipe excellent high temperature resistance, corrosion resistance and oxidation resistance.
- Physical and mechanical properties
From the point of view of physical properties, the density of Inconel 718 seamless steel pipe is about 8.19 g/cm ³, with a high density and weight, which makes it excellent in the need to withstand heavy loads and high pressures. In addition, the elastic modulus and rigid modulus of the alloy tube are about 200GPa and 80GPa respectively, showing good deformation resistance. In the high temperature environment, the expansion coefficient of Inconel 718 seamless steel pipe is moderate, and the thermal conductivity is high, which can effectively resist the deformation and damage caused by thermal stress.
In terms of mechanical properties, Inconel 718 seamless steel pipes show excellent overall performance in a wide temperature range of -253 ° C to 700 ° C. Its tensile strength below 650 ° C ranks first in deformation heat resistant alloy, fatigue resistance, radiation resistance, oxidation resistance and corrosion resistance are also excellent. These characteristics enable the INCONEL 718 seamless steel pipe to operate stably in extreme conditions for a long time and meet a variety of demanding application scenarios.
Third, a wide range of applications
#### 1. Aerospace industry
In the aerospace sector, INCONEL 718 seamless steel pipe is the ideal material for the manufacture of jet engine turbine blades, combustion chambers and other high-temperature components. These components need to withstand extremely high temperatures and pressures during flight, and Inconel 718 seamless steel tubes ensure the safety and reliability of aircraft engines and spacecraft components with their excellent high-temperature strength and corrosion resistance. For example, many advanced military and civil aircraft use Inconel 718 seamless steel pipe manufacturing key components to cope with complex flight environments and harsh operating conditions.
#### 2. Petrochemical industry
The petrochemical industry has high requirements for corrosion resistance and high temperature resistance of equipment. Inconel 718 seamless steel pipes play an important role in the manufacture of chemical equipment and pipes under high temperature and pressure. These equipment, such as catalyst carriers, reactors and cracking furnaces, require long-term stable operation in harsh chemical environments. With its excellent corrosion resistance and high temperature resistance, Inconel 718 seamless steel pipe improves the service life and safety of process plants and reduces maintenance costs.
#### 3. Energy sector
In the energy sector, Inconel 718 seamless steel pipes are widely used in high-temperature components such as turbine components, burners and gas turbine blades in thermal power plants and nuclear power plants. These components need to withstand the harsh environment of high temperature and pressure during the power generation process, and the high temperature strength and oxidation resistance of Inconel 718 seamless steel tubes ensure the efficient and stable operation of energy equipment. Especially in nuclear power plants, the excellent performance of INCONEL 718 seamless steel pipes is of great significance for ensuring the safe operation of reactors.
#### 4. Medical device field
With the continuous progress of medical technology, the requirements for medical device materials are becoming higher and higher. Inconel 718 seamless steel pipe has been widely used in the field of medical devices because of its excellent biocompatibility and corrosion resistance. For example, key components such as artificial heart valves, artificial joints and implantable medical devices are manufactured using Inconel 718 seamless steel pipes. These components require long-term stable operation in the human body, and the excellent performance of the Inconel 718 seamless steel pipe ensures the safety and health of patients.
Processing and welding performance
Inconel 718 seamless steel pipe not only has excellent performance, but also has excellent processing performance and welding performance. The alloy tube is easy to process into various shapes of complex parts to meet the needs of different fields. At the same time, Inconel 718 seamless steel pipe can be connected by various welding methods such as argon arc welding and electron beam welding, which ensures the quality and reliability of welded joints. These characteristics make the INCONEL 718 seamless steel pipe more flexible in the manufacturing process, and can meet a variety of complex design requirements.
####5. Conclusion
In summary, Inconel 718 seamless steel pipe, as a high-performance nickel-based alloy pipe, plays an important role in many fields such as aerospace, petrochemical, energy and medical equipment. Its excellent high temperature strength, corrosion resistance, processing properties and welding properties make it an indispensable and important material in modern industry. With the continuous progress of science and technology and the continuous development of industry, the application prospect of Inconel 718 seamless steel pipe will be more extensive.
