A kind of preparation method of fe-cr-al electrothermal alloy thin-gauge cold-rolled sheet containing yttrium

Abstract

The invention provides a method for preparing thin-specification cold-rolled plates of Fe-Cr-Al electrothermal alloy containing yttrium. The preparation process is: (1) According to the composition ratio of Fe‑Cr‑Al electrothermal alloy, add yttrium with a mass fraction of 0.01 to 0.1%; (2) Classify each raw material, put it into a vacuum induction melting furnace step by step, and smelt Obtain molten steel; (3) Pour the molten steel into a double-roller thin strip casting and rolling mill for casting and rolling, and prepare an yttrium-containing Fe-Cr-Al electrothermal alloy cast strip; (4) Conduct "two single-pass heating" on the cast strip. The composite production process of "rolling + annealing + pickling + repeated cold rolling" is used to prepare thin-specification cold-rolled plate products with cast strips. The solidification structure of the Fe-Cr-Al electrothermal alloy cast strip prepared by the invention is 50 to 150 times more refined than the solidification structure of the conventional process, which improves the processing performance; greatly shortens the thin-specification cold rolling of the Fe-Cr-Al electrothermal alloy The preparation process of the plate, and the mechanical properties of the thin-format cold-rolled plate are equivalent to those of the conventional thin-format cold-rolled plate, and the high-temperature oxidation resistance is better than that of the conventional thin-format cold-rolled plate.

Description

technical field [0001] The invention belongs to the technical field of Fe-Cr-Al electrothermal alloy preparation, in particular to a method for preparing a thin-gauge cold-rolled sheet of Fe-Cr-Al electrothermal alloy containing yttrium. Background technique [0002] Fe-Cr-Al alloy is considered to be the most important electric heating alloy. The electric heating element produced by Fe-Cr-Al electric heating alloy will form a stable and dense oxide film with slow growth rate when used at high temperature, which can act on the alloy. When used for effective protection, it can work normally in a high temperature environment of 1300°C. In addition, the electrothermal alloy has the advantages of large resistivity coefficient, small resistance temperature coefficient, good heat resistance, low specific gravity, etc., and has important applications in the field of life and industrial production, such as water heaters, automobile exhaust purifier carrier parts, Hot gas filtration...

AI Technical Summary

Problems solved by technology

The application of Fe-Cr-Al electrothermal alloys is mostly thin-gauge products below 200μm. Traditional technology is used to produce thick slabs to use specifications. The production process is complicated, energy consumption is huge, production time-consuming, and processing is difficult. It is urgent to develop new products. production process

In addition, Fe-Cr-Al electrothermal alloys have several serious defects: (1) The as-cast structure is abnormally coarse, sensitive to stress, brittle, poor in plasticity and toughness, which is not conducive to processing; (2) High temperature Grain growth tendency and lower creep strength can easily cause embrittlement; (3) the higher the temperature used, the longer the use time, the more serious the grain growth, and the more serious the embrittlement after cooling, and this transformation It is irreversible. The main reason for the brittle fracture of the heating element is caused by abnormally coarse grains.

Patent CN 1011280392 A discloses a carburization-resistant high-temperature electrothermal alloy, which is jointly added with yttrium, dysprosium, and gadolinium elements. The alloy has excellent comprehensive properties and can replace imported anti-carburization and high-temperature resistant electrothermal alloys. 0.1%-1.0%, so it is impossible to predict the effect of adding yttrium alone on high temperature resistant electric heating alloys

Images