Iron-chromium-aluminum alloy with high plasticity and long service life

Abstract

The invention relates to an iron-chromium-aluminum alloy with high plasticity and long service life. The iron-chromium-aluminum alloy comprises the following components in percentage by weight: 13.5-14.5 percent of chromium, 3.5-4.5 percent of aluminum, less than or equal to 0.03 percent of carbon, less than 0.24 percent of silicon, 0.3-0.5 percent of titanium, 0.25-0.35 percent of vanadium and the balance of iron. In the invention, the carbon content of the alloy is controlled: carbon plays a harmful role in the inoxidability of the iron-chromium-aluminum alloy, and the formation of harmful carbonates and nitrides can be avoided by lowering the carbon content, so that the plasticity of the alloy is improved. A reasonable aluminum-chromium content ratio is selected: the oxidizing speed of the iron-chromium-aluminum alloy is lowered along with the increase in the aluminum and chromium content, but the plasticity is lowered along with the increase in the aluminum and chromium content. Titanium is doped: the nitriding resistance and corrosion resistance of the alloy are improved. Vanadium is added: tissue product grains of the alloy can be fined, the grain coarsening temperature is raised, the overheat sensitivity of the alloy is lowered, and high hardness and chemical stability with a silicide formed by silicon are realized.

Description

technical field [0001] The invention relates to an alloy and a manufacturing process thereof, in particular to an iron-chromium-aluminum alloy with good plasticity and long service life. Background technique [0002] Chemical composition of standard electrothermal alloys (GB / T1234-1995) [0003] [0004] Iron-chromium-aluminum alloy is an important electrothermal alloy. Due to the presence of a large amount of Cr and Al in the composition, a dense oxide film will be formed on the surface of the alloy at high temperature, which prolongs the service life of the alloy material. The high aluminum content makes the alloy have high resistivity, which can effectively convert electric energy into heat energy and save electric heating materials. In addition, its excellent high temperature oxidation resistance and cheap price create conditions for mass use. The disadvantage is that the ferrite alloy has low temperature brittleness, 475°C brittleness and high temperature brittlene...

AI Technical Summary

Problems solved by technology

[0005] The 1Cr13Al4 alloy is selected as the research body. Through strict control of chromium content and heat treatment conditions, brittleness at 475 ° C and brittleness at room temperature can be avoided. The biggest disadvantage is that it has an obvious tendency of high temperature embrittlement

The reason is that the high temperature during welding will coarsen the grains of the weld seam and the heat-affected zone, resulting in embrittlement of the alloy, and ultimately shortening the service life of the heating element.

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