How about the high temperature oxidation resistance of stainless steel bracelets

How about the high temperature oxidation resistance of stainless steel bracelets

The surface of stainless steel bracelets is divided into industrial surface and matte surface

A kind of stainless steel bracelets with matte finish, only the exterior has been treated with matte finish. Otherwise, it is the same as ordinary stainless steel bracelets. The disposal method is basically as follows:

Mix the matt liquid 1:1 with water to make the working liquid. At room temperature or heating the electrolyte to 40-50 degrees, hang the lead plate or stainless steel plate on the cathode, fix the workpiece to be electropolished on the anode, then adjust the voltage to about 5 volts, polish for 3-5 minutes, and take out the workpiece. Finished the matt electrolysis technology.

Technical process: chemical degreasing, rust removal → water washing → electrolytic matting → water washing → neutralization → water washing → hot pure water washing

High temperature oxidation resistance, as an important performance index of heat-resistant steel stainless steel bracelets, has been concerned by many researchers. Special alloying elements in steel are an important reason for improving and improving the oxidation resistance of alloys. Under the premise of ensuring basic performance, appropriate addition of alloying elements is an important reason for improving and enhancing the oxidation resistance of alloys. Appropriate addition of alloying elements can be used in steel. Different dense oxide films are formed on the surface to improve its high temperature oxidation resistance.

Heat-resistant stainless steel bracelets are high-chromium high-nickel austenitic stainless steels, which not only have excellent corrosion resistance and mechanical properties, but also have excellent high temperature oxidation resistance and creep resistance. Therefore, it is widely used in various high-temperature furnaces and high-temperature parts in special environments.

There have been studies on the high-temperature oxidation mechanism of heat-resistant stainless steel bracelets. The high temperature oxidation performance of 310S is evaluated by studying the high temperature oxidation test in the air. Based on the analysis of the oxidation kinetics weight gain curve, the morphology, distribution and structure of the oxide film are studied, and the formation mechanism is explained.

The test sample is taken from austenitic heat-resistant stainless steel bracelets hot plate, and the chemical composition is shown in the following table (mass fraction, %): C0.055, Si0.50, Mn1.03, Cr25.52, Ni19.25.

The samples were cut into 30mm×15mm×4mmmm, and 3 parallel samples were used for each test point. The samples were ground and polished with water sandpaper to remove the surface oxide scale and wire cutting traces, and then washed and dried with ethanol. Prepare the same number of crucibles as the samples, number them, and bake them in a resistance heating furnace to make the residual substances in the crucibles fully display and the quality is constant. Place the high-temperature oxidized sample directly in the crucible and put it into the box-type resistance furnace for high-temperature oxidation. The test atmosphere is air, and the oxidation temperature is 800, 900, 1000°C; the processing time of each sample is 20, 40, 60, 80, 100, 120, 140h, respectively. After the oxidation is completed, weigh and record. The weighing instrument is an electronic analytical balance. After the high-temperature oxidation test is over, the oxidation product is analyzed by X-ray diffractometer, and the surface morphology of the oxide film is analyzed by scanning electron microscope and energy spectrometer. The results show that:

(1) Heat-resistant stainless steel bracelets show good oxidation resistance at 800, 900, and 1000°C. With the extension of time at each temperature, there are different degrees of oxidative weight gain trends, but as time extends, the oxidation trend slows down. At the same time, as the temperature increases, the oxidation rate increases.

(2) The oxide film is composed of dense spinel MnCr2O4 and Cr2O3 in the outer layer and SiO2 in the inner layer. With the increase of temperature, the diffraction peak of MnCr2O4 increases and the products increase. The three-layer compact structure and the good oxidation resistance of the oxide itself make the heat-resistant stainless steel bracelets show good high temperature oxidation resistance as a whole.

Stainless steel bracelets are austenitic chromium-nickel stainless steels with good oxidation resistance and corrosion resistance. Because of the higher percentage of chromium and nickel, 310s has much better creep strength, and can continue to work at high temperatures, and has good High temperature resistance.

Density: 8.0 g/cm3, mechanical properties after solution treatment: yield strength ≥ 205, tensile strength ≥ 520, elongation ≥ 40, hardness test: HBS ≤ 187, HRB ≤ 90, HV ≤ 200

310S stainless steel is suitable for making various furnace components, with a maximum working temperature of 1200 ℃ and a continuous use temperature of 1150 ℃.