Preparation method of novel stainless steel material

Abstract

The invention provides a preparation method of a novel stainless steel material. The preparation method comprises the following steps: 1, smelting cast iron in a vacuum induction furnace, adding chromium, silicon and molybdenum when the cast iron begins to melt, adding tungsten, manganese, nickel, boron and vanadium for smelting when the cast iron is completely molten, and casting a consumable electrode; 2, carrying out vacuum arc remelting refining or electroslag remelting refining on the consumable electrode to prepare an electroslag ingot; 3, compressing the electroslag ingot into a stainless steel sheet, and then sequentially carrying out hot forging, first annealing and second annealing on the stainless steel sheet to prepare a stainless steel substrate; 4, carrying out hot rolling on the stainless steel substrate, and then carrying out deep cold rolling till a nanocrystalline stainless steel material layer is formed on the surface layer of the stainless steel substrate; and 5, dipping the stainless steel substrate obtained in step 4 into a sulfuric acid aqueous solution till a passivation film is formed on the stainless steel substrate, and then carrying out cold treatment on the stainless steel substrate obtained in step 4 by adopting a liquid nitrogen gasification method. By adoption of the preparation method provided by the invention, the corrosion resistance of a stainless steel material can be greatly improved, and the high strength and toughness can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of stainless steel production, and in particular relates to a preparation method of a novel stainless steel material. Background technique [0002] With the rapid development of the metallurgical industry and the improvement of daily life standards, the use of stainless steel has greatly increased, and a large number of beautiful and durable stainless steel products have entered the field of civilian consumption. Among them, the use of stainless steel in utensils and kitchen supplies accounts for the vast majority. most. Stainless steel refers to steel resistant to weak corrosive media such as air, steam, water, and chemically corrosive media such as acid, alkali, and salt. It is also called stainless acid-resistant steel. In practical applications, the steel resistant to weak corrosion medium is often called stainless steel, and the steel resistant to chemical medium corrosion is called acid-resistant stee...

AI Technical Summary

Problems solved by technology

The content of Cr in the materials proposed by the above-mentioned invention patents is lower than that of 304 austenitic stainless steel, and at the same time, a higher content of Mn, which is not conducive to corrosion resistance, is added, so the corrosion resistance is significantly lower than that of 304 austenitic stainless steel

[0004] In order to improve the corrosion resistance, the Chinese invention patent CN101148740 added 0-3% Mo to the material, while controlling the Cr content at 16-18%, the N content at 0.1-0.4%, and the Ni content reduced to 0-2%, but the composition The Mn content in the medium is still as high as 14-19%; similarly, the Chinese invention patent CN101381852 adds 0.001-0.3% Mo to the material to improve corrosion resistance, but the Mn content in this invention is still as high as 12.1-14.8%. The N content is as high as 0.2-0.45%, and the smelting and processing of the material are difficult

In the European invention patent EP1690957, the Mn content is controlled at 7-8.5%, and the Cr content reaches 16.5-18%. At the same time, by adding 0.1-0.5% Mo, the material can obtain corrosion resistance close to that of 304 austenite, but the Ni content in the alloy Higher, 3.5-4.5%, makes the raw material cost of the alloy not much different from that of 304 austenitic stainless steel