Low-nickel austenitic stainless steel and manufacturing method thereof

Abstract

The invention relates to a low-nickel austenitic stainless steel, which comprises the following chemical components by weight percent: no less than 0.05% and no more than 0.15% of C, less than 1.00% of Si, more than 9.00% and less than 10.00% of Mn, no less than 14.00% and no more than 16.00% of Cr, no less than 0.50% and less than 1.00%, more than 0.15% and no more than 0.25% of N, more than 1.50% and no more than 2.00% of Cu, no less than 10*10<-4>% and no more than 30*10<-4>% of B, no less than 1*10<-4> and no more than 50*10<-4>% of Ca, less than 0.030% of P, no less than 0.020% of S and the balance of Fe and inevitable impurities. For the stainless steel, heat processing performance of materials is improved through B alloying treatment on premise of further reducing the content of precious metal of nickel, and the purity of the liquid steel is enhanced through Ca treatment. The formability of stainless steel is enhanced through the reasonable alloy system design and a micro-alloy treatment method, the defects of sand buckle, sand holes, and the like are avoided in the forming process, the delayed rupture phenomenon is lightened, and the application scope of the festival nickel austenitic stainless steel is further broadened.

Description

technical field [0001] The invention relates to austenitic stainless steel, in particular to a nickel-saving austenitic stainless steel with excellent hot workability and formability. Background technique [0002] At present, the austenitic stainless steels widely used at home and abroad are mainly 300 series and 200 series, such as AISI304 and AISI201 and other austenitic stainless steels. However, these austenitic stainless steels contain more nickel, and the addition of a large amount of nickel leads to The cost of raw materials of these austenitic stainless steels increases, thus limiting the application range and sustainable development of these steels. [0003] Traditional nickel-saving austenitic stainless steels, including AISI201 and AISI301, etc., as shown in Table 2, generally adopt the alloying method of nitrogen and manganese replacing nickel, which obviously reduces the cost of raw materials, but due to the austenite stabilizing elements The reduction of nicke...

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Problems solved by technology

[0012] In Table 1 and Table 2, the patent ZL98117555.4 describes the chemical composition of a nickel-saving austenitic stainless steel, in which the nickel content is reduced to an extremely low content (0.1%≤Ni≤2.0%), but The manganese content (5.0%≤Mn≤9.0%) is not very high and the range is too wide, which will reduce the stability of austenite, making it difficult to avoid excessive strain-induced martensite during room temperature deformation and reduce the formability of stainless steel

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