High nitrogen and low nickel austenite stainless steel alloy and manufacturing method thereof

Abstract

The invention relates to a high nitrogen and low nickel austenite stainless steel alloy. The high nitrogen and low nickel austenite stainless steel alloy, based on the total weight of 100%, comprisesthe following elements in percent by weight: 16-18wt% of chromium, 1-5wt% of nickel, 0.4-0.7wt% of nitrogen, 1-3wt% of molybdenum, less than or equal to 0.075wt% of carbon, less than or equal to 1wt%of silicon, less than or equal to 2wt% of manganese, 0.1-1wt% of vanadium and the balance ferrum and inevitable impurities. By adding vanadium particularly into the high nitrogen and low nickel stainless steel alloy, the nitrogen solubility can be increased, the dosage of nickel is reduced, the tensile strength and the yield strength of the stainless steel alloy are improved, and the corrosion rate and the manufacturing cost are lowered.

Description

technical field [0001] The present invention relates to a stainless steel alloy and a manufacturing method thereof, and in particular to a high-nitrogen and low-nickel washer stainless steel alloy and a manufacturing method thereof. Background technique [0002] According to the definition of EN 10088-1, steel is called stainless steel when it contains at least 10.5wt% chromium and does not contain more than 1.2wt% carbon. Stainless steel has better corrosion resistance and heat resistance than ordinary steel, and it can always maintain a metallic luster in the atmosphere. The principle of stainless steel's corrosion resistance is: chromium forms a continuous and dense oxide film (commonly known as a passivation film) on the metal surface. This passivation film can isolate the contact between the metal and the external environment, so it has the function of corrosion resistance. The passivation film on the surface of stainless steel can isolate the contact between the meta...

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Problems solved by technology

Melting under high nitrogen pressure is also an effective method to increase the solubility of nitrogen in stainless steel. Fe-Cr-Mn Worth field iron stainless steel is smelted under high nitrogen pressure (nitrogen pressure up to 50 atmospheres) to produce nitrogen content as a weight percent 0.8-1.5wt% or 0.8-1.8wt% stainless steel materials, but such high-pressure melting equipment is expensive and consumes a lot of nitrogen during production, resulting in increased manufacturing costs, and smelting under high pressure also increases the risk of the process

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