A kind of manufacturing method of rare earth heat-resistant steel plate

Abstract

A method for manufacturing rare-earth heat-resistant steel plates. The rare-earth heat-resistant steel is firstly smelted with an intermediate frequency induction furnace and an AOD furnace for self-consumable electrodes, and then undergoes electroslag remelting to obtain qualified electroslag slabs. The slag slab is hot-rolled into a plate of specified specifications. During smelting, the rare earth Ce content in the consumable electrode is controlled at 0.10% to 0.15%. Electroslag remelting is carried out with five-element electroslag system. The rare earth content in the slag remelting process is stable and controllable, and the electroslag remelting slab can be directly fed into the rolling mill to be rolled into a plate. Compared with the production of general-standard steel ingots, not only can the chemical composition of the plates be guaranteed, but also the performance of the products is more excellent due to the improvement of the solidification quality of the electroslag ingots; It shortens the production period and has good economic benefits.

Description

technical field [0001] The invention relates to the technical field of rare-earth heat-resistant steel, in particular to a method for manufacturing a rare-earth heat-resistant steel plate. Background technique [0002] Rare earth elements in steel have many beneficial effects such as purification of molten steel, denaturation of inclusions, grain refinement, microalloying, etc., and can significantly improve the oxidation resistance, high temperature strength and plasticity, fatigue life, corrosion resistance and corrosion resistance of steel. fissure etc. However, rare earth elements are extremely active, and their yield is related to many factors such as the degree of deoxidation of molten steel, the temperature of tapping, and the timing of adding them. Therefore, it is difficult to accurately control the content of rare earth elements. [0003] At present, most rare earth steels only provide the upper limit range of rare earth content, and rare earth is added to steel a...

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Problems solved by technology

[0005] The patent "High Performance Corrosion Resistant Rare Earth Super Duplex Stainless Steel and Its Smelting Process" provides a smelting method of rare earth duplex stainless steel (Re≤0.2%), which uses Re-Mg-Ca treatment in the smelting of consumable electrodes molten steel, and use ReO in electroslag remelting 2 :MgO:CaO:CaF 2 :Al 2 o 3 =10%:10%:10%:50%:20% five-element slag system for remelting, and continuously add active Re-Mg-Ca reducing agent to the slag pool evenly during electroslag remelting to control rare earth burning loss, However, judging from the actual smelting effect, the deoxidation effect is not good ([O]=30~50ppm), and the rare earth content in the steel after electroslag fluctuates greatly (Re=0.0096%~0.055%), so it is only suitable for the upper limit requirement of rare earth If it is a steel type that has an upper and lower limit range for rare earths, there will be a great risk

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