Low-nickel austenitic stainless steel

Abstract

The invention relates to an austenitic stainless steel with low content of nickel. By weight percentage, the austenitic stainless steel with low content of nickel comprises: Cr:13-16.2%, Ni:below 1%, Cu:1.0-2.2%, Mn:8.0-11.2%, N:0.1-0.2%, C0.05-0.1%, Si:0.3-0.6%, and the balance of Fe and unavoidable impurities. In the invention, low valent manganese and nitrogen are used to replace part of high valent nickel; as a result, cost is greatly reduced while the austenitic stainless steel is ensured to have relatively good corrosion resistance and heating and cooling processability; besides, a certain amount of B and Ca can be added to further improve the heating and cooling processability of the stainless steel and avoid edge cracks and M-shaped defects in the process of hot rolling. The austenitic stainless steel of the invention has fine corrosion resistance and heating and cooling processability, heating and cooling processability in particular, thus being capable of replacing stainlesssteel such as 304 steel and 301L steel.

Description

A low nickel content austenitic stainless steel technical field The invention relates to an austenitic stainless steel, in particular to an austenitic stainless steel with low nickel content, and belongs to the field of stainless steel metallurgy. Background technique 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. 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 the...

AI Technical Summary

Problems solved by technology

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

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

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

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

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.