Electrothermal alloy material with excellent high-temperature resistant grain growth behavior and manufacturing method thereof

Abstract

The invention discloses an electrothermal alloy material with an excellent high-temperature resistant grain growth behavior and a manufacturing method thereof. The electrothermal alloy material comprises, by mass, not larger than 0.06% of C, 19.5% to 23.5% of Cr, 5.5% to 6.5% of Al, not larger than 0.03% of N, not larger than 0.5% of Si, not larger than 0.5% of Mn, not larger than 0.03% of P, not larger than 0.03% of S, 0.05% to 0.25% of Zr, 0.01% to 0.2% of Y, 0.5% to 2.5% of Co, and the balance Fe and inevitable impurities. A vacuum induction melting process method is adopted, casting molding is performed after melting, and the material is finally manufactured through hot forging, hot rolling, recrystallization heat treatment, cold rolling and cold drawing. By the adoption of the electrothermal alloy material, the abnormal high-temperature grain growth behavior of Fe-Cr-Al alloy is overcome, the oxidation resistance is improved, heat resistance is improved as well, high-temperature corrosion resistance is enhanced, and the comprehensive performance is excellent.

Description

technical field [0001] The invention belongs to the technical field of iron and steel alloy materials, and in particular relates to an electrothermal alloy material and a preparation method thereof. Background technique [0002] Fe-Cr-Al electrothermal alloy is the most widely used electrothermal alloy in my country. It has good heat resistance, high temperature oxidation resistance, large resistivity coefficient, small resistance temperature coefficient, stable power, high service temperature and low price. For decades, my country has used its own resources to develop and establish a Fe-Cr-Al-based electrothermal alloy system, making my country one of the world's major producers of electrothermal alloys and the largest producer of Fe-Cr-Al alloys. Fe-Cr-Al electrothermal alloy is a single-phase alloy based on iron, containing 13-27wt.%Cr, 3.5-7wt.%Al, and the matrix structure has a body-centered cubic structure. Commonly used Fe-Cr-Al alloy standard products include 0Cr25A...

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Problems solved by technology

[0003] At present, the Fe-Cr-Al alloy model KanthalA-1 produced by Swedish KANTHAL company has a service temperature of up to 1400°C, a long service life, very high resistivity and excellent high temperature oxidation resistance, but the grain grows significantly. , long-term use, variability, excessive elongation, short circuit and other serious consequences, and abnormally coarse grains are likely to cause brittle fracture of the heating wire

However, the normal service temperature of 0Cr27Al7Mo2 produced in my country is 1200-1300°C, which is still a certain gap compared with similar foreign products.

When Fe-Cr-Al electric heating alloy is used to manufacture the electric furnace wire of the heating furnace, the main problem is that the high temperature oxidation is serious, it is easy to be partially fused, and the service life is too short

If Ni-Cr alloy is used to replace Fe-Cr-Al alloy, the service temperature is too low to meet the requirements; if refractory metal or non-metallic heating element is used to replace Fe-Cr-Al alloy, the price is too expensive

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