Slag system for ingot drawing electroslag remelting superaustenitic stainless steel

Abstract

The invention belongs to the technical field of special alloy refining, and discloses a slag system for ingot drawing electroslag remelting superaustenitic stainless steel. The slag system for ingot drawing electroslag remelting superaustenitic stainless steel adopts a five-element slag system and is characterized in that the five-element slag system comprises the following components in percentage by weight: 40-55% of CaF2, 15-25% of Al2O3, 20-30% of CaO, 2-3% of MgO and 5-8% of SiO2. The slag system overcomes the defects of the prior art, solves the problems that slag is doped inside steel ingots and steel and slag are leaked in the ingot drawing process, and the steel ingots with good surface and internal quality are smelted.

Description

technical field [0001] The invention belongs to the technical field of special alloy refining, and relates to a slag system for electroslag remelting super austenitic stainless steel. Background technique [0002] Because super austenitic stainless steel belongs to austenitic stainless steel with high nickel, high molybdenum and copper and nitrogen, it is a relatively difficult steel to smelt, easy to segregate, crack, etc., and is the most demanding and difficult variety of stainless steel in production technology. At present, the electroslag remelting of super austenitic stainless steel mainly has the following problems: [0003] ①Using the traditional fixed electroslag remelting production, one steel ingot is remelted at a time, the head and tail removal amount is large, and the yield of the steel ingot is low. And when producing small cross-section steel ingots, the ratio of remelting speed to the diameter of electroslag steel ingots is as low as 0.65-0.75, resulting in...

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Problems solved by technology

[0003] ①Using the traditional fixed electroslag remelting production, one steel ingot is remelted at a time, the amount of head and tail removal is large, and the yield of the steel ingot is low

And when producing small cross-section steel ingots, the ratio of remelting speed to the diameter of electroslag steel ingots is as low as 0.65-0.75, resulting in low production efficiency and increased smelting costs

[0004] ②The above problems can be solved by adopting T-shaped crystallizer to draw ingots for electroslag remelting. However, the design of the slag system is often unreasonable, which is mainly manifested in: the viscosity of liquid slag is too high at high temperature, and the separation of steel slag is not easy, and it will be in the steel ingot and Slag inclusions are formed on the surface; at high temperatures, the viscosity of liquid slag is too small and the fluidity is good. The slag in the solid-liquid two-phase region is easily broken during the ingot drawing process, and the molten steel and slag flow from the broken gap to solidify On the surface of steel ingots, slag leakage and steel leakage problems occur

None of the above documents and patents involve the slag system for electroslag remelting of super austenitic stainless steel ingots.

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