A method for continuous casting of a free-cutting stainless steel square billet

By optimizing the pretreatment, protective casting, lubricant use, temperature control, and electromagnetic stirring processes in the continuous casting of free-machining stainless steel billets, the problems of high leakage rate and large defects in continuous casting were solved, and high-quality billet production was achieved.

CN115635054BActive Publication Date: 2026-02-27SHANXI TAIGANG STAINLESS STEEL CO LTD
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Patent Information

Application Number
CN202110810269.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-07-19
Publication Date
2026-02-27
Estimated Expiration
2041-07-19

AI Technical Summary

Technical Problem

In the continuous casting process of free-cutting stainless steel billets, the rate of steel leakage during casting is as high as 60%, and the low magnification center porosity and shrinkage cavity defects of the billet are greater than level 2, which affects product quality.

Method used

The process involves pre-treatment of molten iron for smelting, protective casting, application of lubricant to the crystallizer, control of molten steel temperature and casting speed, use of strong cooling water and special protective slag for sulfur-containing stainless steel, and optimization of crystallizer and end electromagnetic stirring parameters to control casting process parameters.

Benefits of technology

It effectively reduced the rate of steel leakage during continuous casting to 0, and reduced the defects of low-magnification center porosity and shrinkage cavity in square billets to below level 1, thereby improving product quality.

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Abstract

The application belongs to the technical field of continuous casting and relates to a free-cutting stainless steel bloom continuous casting method. The free-cuting stainless steel bloom continuous casting method comprises the following steps: 1) after molten iron is pretreated and smelted into qualified molten steel, the molten steel is lifted to a continuous casting fork arm by a crown block; 2) argon blowing is performed on a tundish for 5-10 minutes before pouring, and protective pouring is implemented throughout the continuous casting; 3) rapeseed oil is applied on the surface of a copper pipe of a crystallizer before pouring; 4) a pouring process; and 5) combined electromagnetic stirring parameters of the crystallizer and a terminal are 550 A / 4.5 Hz and 600 A / 15 Hz, and the parameters are reversed after 20 seconds. When the free-cutting stainless steel bloom is continuously cast by the application, the continuous casting open pouring leakage rate is reduced from 60% to 0, and the bloom low-multiple center porosity and shrinkage hole defects are reduced from level 2 to below level 1.
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Citation Information

Patent Citations

  • Continuous casting production process for improving quality of free cutting steel casting blank

    CN102303108A