Double-phase stainless steel with high nitrogen, high chromium and low nickel

Abstract

The invention provides a double-phase stainless steel with high nitrogen, high chromium and low nickel. The alloy of the stainless steel comprises the following components in percentage by weight: less than or equal to 0.05 percent of C, less than or equal to 1.0 percent of Si, 10 to 14 percent of Mn, less than or equal to 0.02 percent of S, less than or equal to 0.035 percent of P, 28.0 to 30.0 percent of Cr, 1.0 to 3.0 percent of Ni, 1.0 to 3.0 percent of Mo, 0.4 to 0.60 percent of N, less than or equal to 0.020 percent of B and/or 0.005 to 0.020 percent of Ce, and the balance of Fe and inevitable impurity. The steel has good mechanical property and high corrosion resistance, and can be produced by a conventional method. Because proper amount of cheap nitrogen and manganese are adopted for replacing the nickel to stabilize austenite in the super double-phase steel, the cost is reduced; and meanwhile, B and Ce elements are used for deoxidation and desulphurization, the existence of a low-melting sulfide in the phase boundary is avoided, and the high-temperature thermal plasticity of the steel is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel alloy materials, and specifically relates to duplex stainless steel, more specifically to a high-nitrogen, high-chromium, low-nickel duplex stainless steel. Background technique [0002] Duplex stainless steels are composed of austenite and ferrite and have been developed for nearly 80 years. In the early 1970s, with the development of AOD and VOD refining processes, especially the ability to control the addition of nitrogen in the AOD furnace, the development of nitrogen-containing duplex stainless steel was promoted, such as 2205 duplex stainless steel (its nitrogen Content 0.15% or so). The addition of nitrogen not only improves the local corrosion resistance of steel, but also solves the welding problem of stainless steel, making duplex stainless steel a weldable structural material, which greatly broadens the application range of duplex stainless steel. In some special industrial fiel...

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Problems solved by technology

At present, Cr18Ni2, Cr21Ni2 and Cr25Ni2 products have been developed, but Cr29Ni2 products have not been reported

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