Resource-saving austenitic heat-resistant steel and preparation method thereof

Abstract

The invention provides resource-saving austenitic heat-resistant steel. The chemical components of the resource-saving austenitic heat-resistant steel comprise, by mass, 0.04-0.08% of C, 2.0-3.5% of Si, 6.4-7.5% of Mn, 22.0-24.0% of Cr, 9.0-11.0% of Ni, 0.1-0.25% of N, 1.0-2.0% of Cu, 0.5-1.2% of Mo, 0.5-1.2% of W, less than or equal to 0.035% of P, less than or equal to 0.005% of S, and the balance Fe and inevitable impurities, wherein the ratio of Creq to Nieq is controlled to be 1.3-1.8; Creq=%Cr+1.5*%Si+%Mo+%W; Nieq=%Ni+30*(%C+%N)+0.5*%Mn. A preparation method comprises the steps of smelting of molten steel, pouring of plate blanks, heating, hot rolling, winding, hot annealing and pickling, cold rolling and cold annealing and pickling. The resource-saving austenitic heat-resistant steel has the advantages that the component proportion is scientific and reasonable, the alloy cost and the batch production difficulty are effectively reduced, the preparation process is simple, the production cost is low, the yield and the product quality are improved, and the resource-saving austenitic heat-resistant steel has excellent oxidation resistance.

Description

technical field [0001] The invention relates to an austenitic heat-resistant steel, in particular to a resource-saving austenitic heat-resistant steel and a preparation method thereof. Background technique [0002] Austenitic heat-resistant stainless steel with a service temperature greater than 900°C generally contains relatively high chromium and nickel elements, such as 309S and 310S, and the sum of chromium and nickel content is up to about 45%. This kind of heat-resistant steel is not only expensive and difficult to manufacture, but also tends to form carbides at the grain boundaries after long-term high-temperature service, leading to failure, such as figure 1 shown. [0003] After investigation, in the current Chinese patents on austenitic heat-resistant steels, the nickel content of most austenitic heat-resistant steels is greater than 17%, and some are even as high as 34%. A chromium-manganese-nitrogen austenitic heat-resistant steel and its preparation method" an...

AI Technical Summary

Problems solved by technology

Under conventional stainless steel industrial production conditions, it is difficult to realize the production of such high nitrogen content stainless steel products

Generally, the production of high nitrogen steel is realized by increasing the solid solubility of nitrogen under high pressure conditions, so the production cost is relatively high

Images