Ultra-high-strength fastening connecting piece and manufacturing method thereof

Abstract

The invention provides an ultra-high-strength fastening connecting piece. Nickel-cobalt-based alloy is adopted by the connecting piece to be used as a base body, and chemical compositions of the connecting piece comprise C smaller than or equal to 0.025 percent, Mn smaller than or equal to 0.15 percent, Si smaller than or equal to 0.15 percent, P smaller than or equal to 0.015 percent, S smaller than or equal to 0.01 percent, Cr ranging from 19.0 percent to 21.0 percent, Ni ranging from 33.0 percent to 37.0 percent, Mo ranging from 9.0 percent to 10.5 percent, Fe smaller than or equal to 1.0 percent, Ti smaller than or equal to 1.0 percent, B smaller than or equal to 0.05 percent, Al smaller than or equal to 2.0 percent, Zr smaller than or equal to 2.0 percent, O smaller than or equal to 0.05 percent, N smaller than or equal to 0.05 percent, and the balance Co and unavoidable impurities. The created fastening connecting piece can meet the requirement for the tensile strength exceeding 1800 MPa and even can meet the higher tensile strength, and meanwhile the connecting piece has the excellent comprehensive performance.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to an ultra-high-strength nickel-cobalt-based alloy fastening connector. Background technique [0002] At present, the tensile strength of domestic high-end fastening connectors is generally between 1100MPa and 1300MPa, there are few fastening connectors exceeding 1500MPa, and fastening connectors exceeding 1800MPa are rarely used. Ultra-high-strength fasteners have the following advantages: first, the amount of fasteners can be reduced, and second, the specifications of fasteners can be reduced. These two advantages are very advantageous for model weight reduction and space saving, especially in the field of aviation and aerospace. In addition, when the strength of fastened joints is too high, it is bound to lose a lot of plasticity. At the same time, for many metal structural fastened joints, ultra-high strength often brings the risk of hydrogen embrittlement. Some limitations in ...

AI Technical Summary

Problems solved by technology

In addition, when the strength of fastened joints is too high, it is bound to lose a lot of plasticity. At the same time, for many metal structural fastened joints, ultra-high strength often brings the risk of hydrogen embrittlement. Some limitations on application

With the development of industrial technology, the working environment of various products, including fastening joints, is also more severe. Many of them work in corrosive environments or in marine environments. Such parts generally require complex surface treatment to achieve corrosion resistance. effect, but even after surface treatment, the working time in a corrosive environment is short, and it needs to be disassembled and replaced every time it works, and some products with better corrosion resistance have lower strength

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