High-carbon low-ferrite-content austenitic stainless steel plate and production method thereof

Abstract

The invention provides a high-carbon low-ferrite-content austenitic stainless steel plate and a production method thereof. The steel plate comprises, by weight, 0.15%-0.20% of C, 0.4%-0.6% of Si, 1.20%-1.40% of Mn, less than or equal to 0.010% of P, less than or equal to 0.002% of S, 21.0%-22.0% of Cr, 10.5%-11.5% of Ni, 2.0%-3.0% of Mo, 0.035%-0.055% of N and the balance Fe and inevitable impurities. The content of delta-ferrite in the steel plate is less than 1%. The manufacturing method comprises the steps of smelting, casting, electroslag remelting, heating, forging, homogenizing heat treatment, rolling and grain boundary engineering control. The steel plate produced through the method has good mechanical properties and good comprehensive properties and is suitable for a long-term service environment of nuclear power station core components, and high efficiency and safety of nuclear power equipment operation are ensured.

Description

technical field [0001] The invention belongs to the field of iron and steel materials, and in particular relates to a high-carbon low-ferrite content austenitic stainless steel plate and a production method thereof. Background technique [0002] For 300 series austenitic stainless steel, in order to improve its resistance to high temperature stress corrosion between crystals, it is used in the production of key equipment for nuclear power. On the basis of adding a certain amount of Cr and Ni elements, a certain amount of Mo must be added to the steel. Elements, compared with other austenitic stainless steels, it is easier to form high-temperature δ-ferrite, and for medium and thick plates, due to the difference in cooling rate during the solidification of molten steel, serious segregation of Cr and Mo elements will occur, and more Conducive to the formation of high temperature δ-ferrite. In addition, the high-temperature δ-ferrite is very easy to gather in the loose center ...

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Problems solved by technology

There is an essential difference between the reference document and the present invention. The comparison patent adopts multi-stage water cooling and air cooling heat treatment, which greatly increases the production cost from the perspective of production technology, and the ferrite content is relatively high; at the same time, the bainite + ferrite dual phase Compared with austenite single-phase structure, its resistance to intergranular corrosion is poor

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