The high temperature oxidation resistance of stainless steel heat-resistant steel 310S is its important performance index, and the special alloying elements in the steel are the key factors to improve and improve the oxidation resistance of the alloy. Under the premise of ensuring basic properties, it is very important to add alloying elements appropriately.
The high temperature oxidation resistance of stainless steel heat-resistant steel 310S is its important performance index, and the special alloying elements in the steel are the key factors to improve and improve the oxidation resistance of the alloy. Under the premise of ensuring basic properties, it is very important to add alloying elements appropriately. A good method because these alloying elements can form a dense and thin oxide film on the surface of stainless steel, thereby increasing the high temperature oxidation resistance of the material.
310S heat-resistant stainless steel is a high-chromium high-nickel austenitic stainless steel. It not only has excellent corrosion resistance and mechanical properties, but also has good high temperature oxidation resistance and creep resistance. Therefore, it can be used to manufacture various high-temperature furnaces and high-temperature components in special environments.
For the high-temperature oxidation mechanism of heat-resistant stainless steel 310S, industry experts have also carried out corresponding research. The high temperature oxidation performance of 310S stainless steel was tested by the research on the high temperature oxidation test of 310S stainless steel in air. On the basis of analyzing the oxidation kinetic weight gain curve, the morphology, distribution and structure of the oxide film on the stainless steel surface were studied.
The experimental samples were taken from the austenitic heat-resistant stainless steel 310S hot-rolled sheet of Taiyuan Iron and Steel, with the chemical composition of carbon 0.055, silicon 0.50, manganese 1.03, chromium 25.52, and nickel 19.25.
The stainless steel samples were cut into 30mm × 15mm × 4mmmm, and 3 parallel samples were used for each test point. Grind the surface of the sample, remove the surface oxide scale and wire cutting marks by sanding with water sandpaper, then wash with ethanol and blow dry. In addition, prepare the same number of crucibles as the samples, number them respectively, and bake them in a resistance heating furnace to fully volatilize the residual materials in the crucibles and keep the quality unchanged. The high temperature oxidation sample is directly put into the crucible, and put into a box-type resistance furnace for high temperature oxidation. The test atmosphere was air, and the oxidation temperature was 800, 900, and 1000 °C; the treatment time of each sample was 20, 40, 60, 80, 100, 120, and 140 h, respectively. After oxidation is complete, weigh and record. A scale is an electronic analytical balance. After the high temperature oxidation test, the oxidation products were analyzed by x-ray diffractometer, and the surface morphology of the oxide film was analyzed by scanning electron microscope and energy dispersive spectrometer.
The experimental analysis data show that the heat-resistant stainless steel 310S has good oxidation resistance at 800, 900 and 1000 ℃. At each temperature, there will be varying degrees of oxidative weight gain over time, but the oxidative trend will also slow down over time. In addition, the oxidation rate gradually increased as the temperature continued to increase.
Secondly, the outer layer of the oxide film on the surface of 310S stainless steel is composed of dense spinel MnCr2O4 and Cr2O3, and the inner layer is SiO2. With the increase of temperature, the diffraction peaks of MnCr2O4 increase, and the products increase. The three-layer dense structure combined with the good oxidation resistance of the oxide itself makes the heat-resistant stainless steel 310S exhibit excellent high-temperature oxidation resistance as a whole.