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 secondary annealing treatment on metal parts. However, this treatment not only increases the process and increases the cost, but also causes irreversible discoloration of the material due to high temperature, which cannot meet the needs of clothing and bags. Requirements for metal fittings or accessories

Images