High-strength and low-expansion hot-rolled invar alloy

Abstract

The invention discloses a high-strength and low-expansion hot-rolled invar alloy. The high-strength and low-expansion hot-rolled invar alloy comprises, by weight, 0.1%-0.4% of C, 34%-42% of Ni, 1.5%-5.5% of Mo, 0.002%-0.03% of N, 0.015%-0.04% of Al, 0.005% or less of S, 0.005% or less of P, one or more of 0.01%-0.4% of Nb, 0.005%-0.55% of V and 0.02%-0.2% of Ti, and the balance Fe and inevitable impurities. According to the alloy, the content of S and the content of P are controlled strictly; the content of nitrogen in the alloy is effectively increased, and elements such as Nb, V, Ti and Mo are added properly, in this way, under the premise that the low thermal expansion coefficient of the alloy is guaranteed, the tensile strength of an austenite hot-rolled matrix is enhanced by means of composite dispersed precipitation of nitrides and carbides, and a high-quality base material is provided for further development of products such as cold-drawn invar alloy wires. According to the alloy, fine particles of NbN, TiN, VN, VC, Mo2C, NbC and the like are dispersively distributed on the austenite matrix, so that the tensile strength is effectively improved, and the expansion coefficient is reduced. The high-strength and low-expansion hot-rolled invar alloy has the characteristics that production cost is low, the operation process is simple, and the raw materials of the alloy are saved.

Description

technical field [0001] The invention relates to an alloy, especially a high-strength and low-expansion hot-rolled Invar alloy. Background technique [0002] The iron-nickel alloy (also known as Invar alloy) with a nickel mass fraction of 36% can exhibit an extremely low thermal expansion coefficient below the Curie temperature, and has great application value in precision instruments, electronics industry, aerospace and other fields. It is a key material for making display shadow masks, thermal bimetallic strips, glass sealing wires, microwave resonators, precision laser components, liquid natural gas and liquid oxygen storage tanks, etc. [0003] It should be pointed out that the "YB / T5241-2005 Low Expansion Iron-Nickel, Iron-Nickel-Cobalt Alloy" standard stipulates that the alloy composition (weight %) within the scope of 4J36 is: C≤0.05%, Ni35~37%, Mn0.2~ 0.6%, Si≤0.3%, S≤0.02%, P≤0.02%, and the rest are Fe and unavoidable impurities. The 4J36 alloy produced by relying ...

AI Technical Summary

Problems solved by technology

The 4J36 alloy produced by relying on this chemical composition has a tensile strength of less than 500 MPa at room temperature and can only be used as a functional material for a long time, which is difficult to meet the performance requirements of structural materials in the new situation

There is a problem of insufficient precipitation strengthening effect of simple carbide phase, or the problem of complicated process control of the precipitation strengthening process of intermetallic compounds

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