Method for smelting return scrap of martensitic stainless steel used for impeller

A technology of martensitic stainless steel and return materials, applied in the field of metallurgy, can solve the problems of return materials or waste forgings that cannot be used, and achieve the effects of improving various mechanical performance indicators, reducing defects, and improving performance indicators
CN104404356AActive Publication Date: 2015-03-11沈阳科金特种材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
沈阳科金特种材料有限公司
Publication Date
2015-03-11

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Abstract

The invention relates to a method for smelting return scrap of martensitic stainless steel used for an impeller. The method comprises the following steps that the return scrap and / or waste forged pieces are put into a vacuum induction furnace to be refined, and are cooled and poured to form a primary ingot; after the primary ingot is subjected to chemical component analysis, nickel, manganese, chromium, molybdenum and aluminum intermediate alloys and / or carbon serve as materials for adjustment of elementary components, and the alloy components are adjusted. The primary ingot and nickel, chromium, molybdenum and / or silicon in the materials for adjustment of the elementary components are refined for the second time, heating and pouring are conducted after film forming, alternatively, liquid alloy where a film is formed after secondary refinement is added, the carbon and / or the manganese intermediate alloy are alloyed, and heating and pouring are conducted after film forming, so an electrode cast ingot used for a protective atmosphere electroslag furnace is formed. Electroslag remelting is conducted, and a steel ingot for production of impeller products is prepared. The alloy ingot of the recycle scrap can completely meet the requirement of production of qualified impeller products, the production cost is greatly reduced, requirements of projects are met and economic benefits are created.
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Description

technical field

[0001] The invention relates to a method for smelting returned materials of stainless steel, in particular to a method for smelting returned materials of martensitic stainless steel for impellers, and belongs to the technical field of metallurgy. Background technique

[0002] The martensitic stainless steel (ASTM A-473 S41500) alloy for impeller is a material for nuclear main pump impeller in nuclear power projects. The outstanding features of this alloy are low carbon content and excellent corrosion resistance; high Cr and Ni content; H, Low requirements for harmful gas elements such as O and N. It has a relatively high initial melting temperature, good strength and toughness indicators, and good resistance to cold and heat fatigue. Its composition requirements are shown in Table 1.

[0003] Table 1 Chemical composition requirements (wt%).

[0004]

[0005] Preliminary experiments show that in a fixed heat treatment process (quenching temperature 1052±...

Claims

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