Alloy 718 Tube

Alloy718 is a nickel-chromium-based alloy that exhibits excellent performance in high temperature, high pressure, and corrosive environments. Alloy 718 tube main components include nickel (50%), chromium (17%), iron, molybdenum (3%), aluminum (1%), titanium (about 0.9%), and trace amounts of phosphorus, sulfur, silicon, and other elements. Due to its unique chemical composition, Alloy718 exhibits superior mechanical strength and good corrosion resistance.

Steel Process Performance and Requirements

Alloy718 has good welding and processing properties, and its tensile strength can reach more than 1000MPa, especially in high-temperature environments. According to its applicability at different temperatures, the Alloy 718 tube can still maintain good mechanical properties in the range of -253°C to 700°C. The forming process of this alloy can be combined with hot working and cold working to make it more in line with various manufacturing needs.

Chemical composition of Inconel 718

Alloy 718 tube has a complex chemical composition, mainly nickel (Ni), chromium (Cr), molybdenum (Mo) and niobium (Nb). The specific chemical composition is as follows:

Nickel (Ni): 50-55%
Chromium (Cr): 17-21%
Molybdenum (Mo): 2.8-3.3%
Niobium (Nb): 4.75-5.5%
Iron (Fe): Balance (approximately 17-19%)
Other trace elements include titanium (Ti), aluminum (Al), cobalt (Co) and manganese (Mn).
The alloy improves its mechanical properties through precipitation hardening mechanism, especially under high temperature conditions, niobium and titanium interact with nickel to form Ni3(Al, Ti, Nb) precipitation phase, which significantly enhances the strength of the alloy.

Tensile properties of Inconel 718

Inconel 718 has excellent tensile strength and can maintain its mechanical properties even at extremely high temperatures. Alloy 718 tube can maintain high tensile strength at high temperatures of 600-700°C, making it suitable for high-temperature applications such as aircraft engines and gas turbines.

Tensile Strength

Inconel 718 has excellent tensile strength at different temperatures. Typical tensile strength at room temperature is about:

Tensile strength (σb): 1240 MPa

Yield strength (σ0.2): 1030 MPa

At high temperatures, the tensile properties of Inconel 718 remain stable. For example, at 650°C, its tensile strength remains at:

Tensile strength at 650°C: 1125 MPa

Yield strength at 650°C: 950 MPa

Even at higher temperatures, such as 700°C, the tensile strength of Alloy 718 tube can still be maintained at around 1000 MPa.

Elongation

Inconel 718 generally has a low elongation in tensile tests, which means it has strong resistance to fracture. Typical elongation data are:

Elongation at room temperature: 12-15%

Elongation at 650°C: 10-12%

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