Niobium-containing high-carbon nickel-iron-based alloy and preparation method thereof

Abstract

The invention provides a niobium-containing high-carbon nickel-iron-based alloy and a preparation method thereof. The niobium-containing high-carbon nickel-iron-based alloy comprises the following chemical components of C, Cr, Fe, Nb, Mn, Co, a small amount of RE (Y or Ce) and Ni. The niobium-containing high-carbon nickel-iron-based alloy has a gamma phase and a carbide phase formed by Cr23C6, and the volume fraction of the carbide phase is 14%-20%. The niobium-containing high-carbon nickel-iron-based alloy and the preparation method thereof are characterized in that by adding a proper amount of Nb, the alloy has a low oxidation rate and high oxidation film peeling resistance under a high-temperature oxidation environment with the using temperature being lower than 1100 DEG C, and the alloy is suitable for manufacturing components such as high-temperature cracking pipes in petrochemical units and pulverized coal fired boiler overheater or reheater pipes. Besides, as for the alloy, a large amount of Fe replaces part of Ni, so that the production cost is low, and the remarkable price advantage is achieved.

Description

technical field [0001] The invention belongs to nickel-iron-based alloys, and relates to a niobium-containing high-carbon nickel-iron-based alloy and a preparation method thereof. Background technique [0002] In recent years, with the continuous advancement of technology in the petrochemical industry, the requirements for the comprehensive performance of superalloy tubes have become more and more stringent. In petrochemical installations, high-temperature cracking furnace tubes are increasingly widely used. Under long-term high-temperature environments, cracking furnace tubes will be damaged by high temperatures and prone to tube burst failure. The explosion failure of the cracking furnace tube not only brings serious economic losses to the production unit, but also endangers the safety of people's lives and property more seriously. Therefore, the safety and reliability of the high temperature cracking furnace tube has been paid more and more attention. [0003] The crack...

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Problems solved by technology

Patent 201410185497.9 discloses an anti-coking cracking furnace tube. The element composition of the furnace tube matrix includes Fe, Cr, Ni, Mn, Si, C and trace elements. The furnace tube has a very good anti-oxidation effect, but the The oxide film on the inner surface of the furnace tube is an anti-coking oxide film formed on the inner surface of the furnace tube after low oxygen partial pressure treatment, and the coverage of the oxide film is not less than 80%, and the thickness of the oxide film is 0.5-5μm

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