Rare earth-containing heat-resistant alloy steel and slab continuous casting process thereof

Abstract

The invention discloses rare earth-containing heat-resistant alloy steel. The rare earth-containing heat-resistant alloy steel comprises the following chemical elements in percentage by mass: larger than 0 and smaller than or equal to 0.05% of C, larger than 0 and smaller than or equal to 1.0% of Si, larger than 0 and smaller than or equal to 1.0% of Mn, 13%-28% of Cr, 2%-8% of Al, larger than 0 and smaller than or equal to 0.50% of Nb, larger than 0 and smaller than or equal to 0.50% of Co, 0.5%-6% of Mo, 0.01%-0.2% of Y and 0.01%-0.1% of at least one of 57-71 rare earth elements in the periodic table of chemical elements. In addition, the invention further discloses a slab continuous casting production process of the rare earth-containing heat-resistant alloy steel, and in the continuous casting process, the specific water flow of secondary cooling water is controlled to be 1.02 + / -0.10 L / kg. The rare earth-containing heat-resistant alloy steel adopts reasonable chemical components and process design, has excellent quality and performance, can tolerate the use temperature of 1,000-1,300 DEG C, has the elongation of 5%-25% at the use temperature of 1,000-1,300 DEG C, has the oxidation weight loss of 0.2-8.0 g / (cm<2>.h) at the use temperature of 1,000-1,300 DEG C, and has the resistivity of 1.3-1.5 mu omega.m at room temperature.

Description

technical field [0001] The invention relates to a metal material and a manufacturing method thereof, in particular to an alloy steel and a casting process thereof. Background technique [0002] In industrial production, the production of heat-resistant alloys has a history of many years, and many foreign well-known metallurgical enterprises produce heat-resistant alloys. Heat-resistant alloys have the advantages of high porosity, large specific surface area, small heat capacity, high thermal conductivity, and high strength. They can be used as the main raw material for metal carriers in exhaust gas purification devices and are widely used in automobiles, diesel locomotives, and motorcycles. And small general machinery and other industries. [0003] Rare earth-containing heat-resistant alloy is a kind of material based on Fe, Cr and Al elements, adding some alloys such as Mo, Cu, Nb, V and mixed rare earth elements, which can improve high temperature performance, resistivity...

AI Technical Summary

Problems solved by technology

However, rare earth-containing heat-resistant alloys tend to precipitate brittle phases during continuous casting and cooling, making continuous casting slabs prone to cracks and inclusion defects

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