Uniform TP316H austenitic stainless steel electroslag ingot composition and structure process method

Abstract

The invention belongs to the field of ferrous metallurgy, and particularly relates to a process method for uniformizing components and tissues of a TP316H austenitic stainless steel electroslag ingot, which comprises the following steps of: after VD (vacuum degassing), adding a rare earth alloy of which the total amount of molten steel is 100-150ppm, pouring in an argon protection system, and uniformizing the components and tissues of an electrode blank. Argon is blown to form a protective atmosphere before remelting of an argon protection electroslag furnace, burning loss of easily oxidized elements at the bottom of a steel ingot is inhibited, and in the remelting process of the novel pre-melted slag, the arcing current of a crystallizer at 8t and above 8t is all reduced to 6000 A from 8000 A, and the Al content at the bottom of the steel ingot is inhibited from being increased. Subsequent sampling is conducted at the ingot tail and the riser end of the electroslag steel ingot for chemical component detection, it is detected that the burning loss amount of easily-oxidized elements such as Si, Mn and Cr at the bottom of the steel ingot is 0.003% or below, the Al increasing condition at the bottom of the electroslag steel ingot is controlled to be 0.002% or below or even no longer increased, segregation of elements such as C and Mo in steel is controlled to be 0.003% or below, and the chemical components, dendrite sizes and intervals at the two ends of the steel ingot are uniform and consistent.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a process method for uniform chemical composition of TP316H austenitic stainless steel electroslag steel ingots. Background technique [0002] With the continuous advancement of science and technology, austenitic stainless steel is also constantly improving and progressing. Compared with traditional stainless steel, the improved new steel has greatly improved its corrosion resistance. However, in the process of electroslag furnace remelting TP316H stainless steel, in A small amount of oxygen content in the crystallizer and oxygen elements in the slag will oxidize easily oxidizable elements such as Si, Mn, and Cr at the bottom of the ingot during the arcing stage, and the Al in the slag will be oxidized during the arcing stage. 2 o 3 Partially ionized, ionized Al 3+ The ions enter the bottom of the steel ingot, resulting in the increase of Al at the bottom of...

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Problems solved by technology

[0002] With the continuous advancement of science and technology, austenitic stainless steel is also constantly improving and progressing. Compared with traditional stainless steel, the improved new steel has greatly improved its corrosion resistance. However, in the process of remelting TP316H stainless steel in electroslag furnace, A small amount of oxygen content in the crystallizer and oxygen elements in the slag will oxidize easily oxidizable elements such as Si, Mn, and Cr at the bottom of the ingot during the arcing stage, and the Al in the slag will be oxidized during the arcing stage. 2 o 3 Partially ionized, ionized Al 3+ The ions enter the bottom of the steel ingot, resulting in the increase of Al at the bottom of the steel ingot, and the longitudinal composition and structure of the steel ingot are uneven

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