A kind of high-carbon low-ferrite content austenitic stainless steel plate and its production method

Abstract

The invention provides a high-carbon low-ferrite content austenitic stainless steel plate and a production method thereof. The composition of the steel plate is as follows in weight percentage: C: 0.15%-0.20%, Si: 0.4%-0.6%, Mn: 1.20%~1.40%, P≤0.010%, S≤0.002%, Cr: 21.0%~22.0%, Ni: 10.5%~11.5%, Mo: 2.0%~3.0%, N: 0.035%~0.055%, The remaining content is Fe and unavoidable impurities; the content of δ-ferrite in the steel plate is <1%. The manufacturing method includes smelting, casting, electroslag remelting, heating, forging, homogenization heat treatment, rolling, and grain boundary engineering control; the steel plate produced by the invention has good mechanical properties and good comprehensive properties, and is suitable for core components of nuclear power plants The long-term service environment ensures the efficiency and safety of nuclear power equipment operation.

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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