Low-nickel-content austenitic stainless steel

Abstract

The invention relates to a low-nickel-content austenitic stainless steel. The low-nickel-content austenitic stainless steel comprises the following components in percentages by weight: 10-13.2% of Cr, less than 1.0% of Ni, 2.3-3.2% of Cu, 5.0-7.2% of Mn, 1.0-1.5% of F, 0.1-0.2% of N, 0.05-0.1% of C, 0.3-0.6% of Si, and the balance of Fe and other inevitable elements. Cheap copper, fluorine and nitrogen replace part of expensive nickel element, the cost can be greatly reduced, and meanwhile, the austenitic stainless steel has good corrosion resistance and hot and cold workabilities; and furthermore, by addition of a certain amount of P and K, the hot and cold workabilities of the stainless steel can be improved, and edge crack and M-shaped defects in a hot rolling process can be avoided. The austenitic stainless steel has excellent corrosion resistance and hot and cold workabilities, particularly has excellent hot workability, and therefore, can replace stainless steel such as 304 steel and 301 L.

Description

Technical field [0001] The invention belongs to the technical field of stainless steel applications, and particularly relates to an austenitic stainless steel with low nickel content. Background technique [0002] The existing 304 steel grades and 316L steel grades have been widely used in many aspects due to their excellent corrosion resistance, workability, and weldability. However, due to the high content of high-priced elements such as Mo and Ni, the cost is excessive. High, limiting its application in some aspects, current research has been devoted to the development of austenitic stainless steel with low noble metal content and good hot and cold workability. [0003] Chinese patent applications 99110134.0, 200710041181.2, 200710093876.5, 200710156294.7, 200810023408.5 respectively disclose an austenitic stainless steel. Its nickel content has been greatly reduced, but it is still relatively high, and the hot workability of stainless steel is relatively good. The large drop l...

AI Technical Summary

Problems solved by technology

[0002] Existing 304 steel grades and 316L steel grades have been widely used in many aspects because of their excellent corrosion resistance, processability and weldability. However, due to the high content of high-priced elements such as Mo and Ni, the cost is too high. High, which limits its application in some aspects, the current research has been devoted to the development of austenitic stainless steel with low noble metal content and good cold and hot workability

[0003] Chinese patent applications 99110134.0, 200710041181.2, 200710093876.5, 200710156294.7, 200810023408.5 respectively disclose a kind of austenitic stainless steel, the nickel content of which has been greatly reduced, but relatively high, and the thermal workability of stainless steel is relatively good The large drop limits the application of this type of stainless steel

[0004] Chinese patent application 01111434.7 discloses an austenitic stainless steel with a nickel content of less than 2.0%, but the above-mentioned austenitic stainless steel is a stainless steel with a low nickel content. According to the technical solution disclosed in this patent application, it can be seen that its What is pursued is the corrosion resistance of austenitic stainless steel, especially the acid and alkali corrosion resistance. Although its elongation is higher and it has better deep drawing and deep drawing performance than 1Cr18Ni9Ti, the austenitic stainless steel contains more There are too many ferrite-forming elements such as Al elements, which are not good for ensuring the number of austenite phases in stainless steel, and it is also necessary to add rhenium elements with very rare content and extremely dispersed distribution, which causes cost to a certain extent. Moreover, the hot workability of the austenitic stainless steel is also poor, and edge cracks and M-type defects are prone to occur during hot rolling

[0005] Chinese patent application 200710134321.0 discloses a chromium-manganese-copper-molybdenum-based austenitic corrosion-resistant and wear-resistant stainless steel, and its nickel content has also reached below 2%, but the concern is still the effect of alloying elements on the corrosion-resistant and wear-resistant properties of stainless steel Affected, the cold and hot processing performance of the stainless steel is relatively poor

The invention replaces part of the high-priced nickel element with low-priced manganese and nitrogen, which can greatly reduce the cost, and at the same time ensure that the austenitic stainless steel has good corrosion resistance and cold and hot workability; it can also be added by adding a certain amount of B and Ca, to further improve the hot and cold workability of stainless steel, avoid edge cracks and M-type defects in the hot rolling process, but the mechanical strength is weak

[0007] According to the above analysis, it can be known that although many low-nickel-content austenitic stainless steels have appeared, their cost has been greatly reduced compared with 304 and 316L stainless steels, but there is still room for a certain decline in nickel content, and, The current research focuses on the corrosion resistance and wear resistance of austenitic stainless steel while reducing the nickel content. There are not many research reports on the cold and hot workability of austenitic stainless steel by various elements.

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