Inexpensive non-magnetic stainless steel and manufacturing method thereof

Abstract

The invention relates to an inexpensive non-magnetic austenite stainless steel and a manufacturing method thereof. The components comprise, by weight, 0.05-0.12% of C, 0.2-1.0% of Si, 14.0-18.0% of Mn, 16.0-19.0% of Cr, 0-2.0% of Ni, 1.0-3.0% of Cu, 0.1-0.3% of N, 0.001-0.004% of B, and the balance of Fe and unavoidable impurities. According to the present invention, the finished product can maintain the non-magnetic state after 80% of the finished product is subjected to cold rolling reduction; low nickel pig iron with a nickel content of 1-2 wt% and produced by using inexpensive laterite-nickel ore can be adopted as the nickel resource raw material without application of other nickel-containing resources, such that the consumption of the high nickel iron or pure nickel can be substantially saved, and the low cost characteristic is provided; and the inexpensive non-magnetic austenite stainless steel of the present invention has characteristics of no magnetism, high strength, and excellent cold processing performance, and can be widely used in the industries of electrical devices, electronics, instrumentations, springs, zippers and the like.

Description

technical field [0001] The invention relates to the field of stainless steel materials, in particular to a low-cost non-magnetic stainless steel that is still non-magnetic after being deformed by a large reduction and a manufacturing method thereof. Background technique [0002] Industries such as electrical appliances, electronics, and instruments require a large amount of non-magnetic materials, such as hard disks, pointers, automotive dashboards, medical equipment, spring parts, etc. Some industries also put forward higher requirements on the strength of materials. [0003] At present, commonly used non-magnetic stainless steel grades include 301, 304 and 305. The existing problems mainly include: [0004] (1) Many industries, especially the electronic instrument industry, require materials to remain non-magnetic after certain forming. However, 301 and 304 belong to metastable austenitic stainless steel. Such materials are prone to deformed martensitic structure after ...

AI Technical Summary

Problems solved by technology

Such materials often require high-temperature annealing and pickling after forming, which often prolongs the production cycle of the product and brings energy consumption and environmental pollution;

[0005] (2) Although 305 stainless steel basically does not have the above problems, because its nickel content reaches 10.5-13.0%, it is expensive and only limited to high-end products, so its application is limited

[0006] (3) Since the price of nickel resources has fluctuated greatly in recent years, it has brought huge cost pressure and difficulty in risk control to enterprises using stainless steel materials with high nickel content (such as 304 and 305)

[0013] Both Chinese patents CN101560634A and CN102560286A disclose a non-magnetic high-strength austenitic stainless steel, but its Ni content is above 3.5%, and the cost is relatively high

[0014] Chinese patents CN102199738A and CN102002642A both disclose a non-magnetic high-strength stainless steel, but its N content is very high, both above 0.4%, it is difficult to produce by continuous casting, and the alloy cost is high

[0015] All in all, none of the above disclosed related invention patents can well take into account the requirements of non-magnetic properties after large deformation, low alloy cost and low manufacturing difficulty.

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