Preparation technique of rare-earth 0Cr17Ni4Cu4Nb chemical fiber spinneret die steel

Abstract

The invention discloses a special rare-earth 0Cr17Ni4Cu4Nb steel which comprises the following chemical components in percentage by weight: at most 0.07% of C, at most 1.00% of Si, at most 1.00% of Mn, at most 0.035% of P, at most 0.03% of S, 3.00-5.00% of Ni, 15.5-17.5% of Cr, 3.00-5.00% of Cu, 0.15-0.45% of Nb, 0.05-0.25%% of Re and the balance of Fe. The invention also discloses a method for preparing the special steel, which comprises the following steps: smelting, casting, electroslag remelting, casting, forging or hot rolling, solution treatment and aging treatment. The method is characterized in that a rare-earth element is added in the later refining period of the refining furnace, and the superheating temperature of the molten steel before adding the rare earth is controlled within 80 DEG C. By optimizing the forging and heat treatment schedules, the method improves the interior metallurgical structure of the steel, refines the crystal grain of the structure and reduces the internal stress of deformation on the basis of the deformation recrystallization and aging precipitation mechanisms after thermal deformation, thereby enhancing the hardness and plasticity of the material and lowering the crack sensitivity of the material; and thus, the material can satisfy the operating requirements for chemical fiber spinneret die steel.

Description

technical field [0001] The invention relates to a mold steel for a chemical fiber spinneret plate, which is mainly used in the preparation of a chemical fiber spinneret mold, and is a high-quality rare earth type mold steel. Background technique [0002] In recent years, my country's technical equipment has been greatly improved, and the application and demand for stainless steel and special steel are increasing. However, in some special industrial fields, especially the application of chemical fiber fiber mold steel, because of the extremely high requirements for the comprehensive performance of steel, the typical single-phase It is difficult for stainless steel to meet its needs, and the demand for new materials with high wear resistance, corrosion resistance and high processing yield is becoming more and more obvious. [0003] Typical 0Cr18Ni9 austenitic stainless steel has excellent welding performance and pressure processing performance, but does not have the high streng...

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Problems solved by technology

[0006] In recent years, with the gradual use of rare earth elements in the field of high-quality alloy steel, the effect of rare earth elements on improving the metallurgical quality of steel and the mechanical properties of products is obvious. Liquid secondary oxidation burning loss, product quality stability is difficult to control, it is difficult to achieve the purpose of rare earth elements to improve mechanical properties, denature non-metallic inclusions and improve the internal metallographic structure of the product

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