Manufacturing method of high manganese high nitrogen low nickel non-magnetic stainless steel and product thereof

Abstract

The invention provides a manufacturing method of a high manganese high nitrogen low nickel non-magnetic stainless steel and a product thereof. The stainless steel is single phase austenite stainless steel which comprises the following chemical components in percentages by mass: greater than 0 but less than or equal to 0.1% of C, less than or equal to 0.01% of S, less than or equal to 0.015% of P, greater than 0 but less than or equal to 1.0% of Si, greater than or equal to 16% but less than or equal to 18% of Mn, greater than 0 but less than or equal to 2% of Ni, greater than or equal to 10% but less than or equal to 14% of Cr, greater than or equal to 1% but less than or equal to 2% of N, greater than or equal to 0.3% but less than or equal to 1% of Cu, greater than or equal to 0.3% but less than or equal to 5% of Mo, greater than or equal to 0.3% but less than or equal to 1% of Nb and the balance of Fe. The manufacturing method comprises the following steps: heating and smelting raw materials, and performing decarbonization, desulfuration and deoxygenation; raising the temperature to 1600 DEG C and adding nickel; adjusting the temperature of a bath to 1550 DEG C, and adding ferromolybdenum, ferrocolumbium and a metal copper; adding a desoxidant for secondary deoxidization, introducing nitrogen, adjusting the temperature of the bath to 1610-1620 DEG C, and adding nitrogen containing ferrochromium; adjusting the temperature of the bath to 1150-1250 DEG C, introducing nitrogen, adding nitrided ferromanganese, pouring, quenching and air cooling, and machining to form a panel, heating the panel to 650-700 DEG C, keeping the temperature for 30min, and performing furnace cooling to room temperature. The stainless steel through deep punching is still non-magnetic, and needs not to be annealed and demagnetized. The manufacturing method is high in nitrogen-increasing efficiency and low in loss of equipment.

Description

[0001] 【Technical Field】 [0002] The invention relates to the field of iron and steel, in particular to a method for manufacturing high-manganese, high-nitrogen, low-nickel non-magnetic stainless steel and its products. [0003] 【Background technique】 [0004] Austenitic stainless steel is an interstitial solid solution formed by elements such as chromium and nickel in γ-Fe. In order to keep the chromium-nickel steel completely austenitic, the nickel content in the steel should be no less than the value of the following empirical formula: [0005] Ni(%)=1.1(Cr+Mo+1.5Si+1.5Nb)-0.5Mn-30C-8.2 [0006] The main characteristics of austenitic stainless steel are: non-magnetic at room temperature, low yield ratio of steel, good plasticity, good welding performance, easy smelting and casting and hot forming; its composition is characterized by high chromium (≥17 %), nickel (8%-25%) and other elements that improve corrosion resistance (such as molybdenum, copper, silicon, niobium, titanium, etc...

AI Technical Summary

Problems solved by technology

[0007] However, although this type of stainless steel is non-magnetic at room temperature, it will produce obvious magnetism after deep drawing and other mechanical processing. unpassable problem

At present, the only way to eliminate the above-mentioned mechanical magnetism is to perform secondar

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