[China Aluminum Network] Austenitic heat-resistant steel 310S has high nickel and chromium content, excellent corrosion resistance in oxidizing media, and good high-temperature mechanical properties, so it can be used for both corrosion-resistant parts and for High-temperature components have been widely used in petrochemical and other high temperature oxidation environments. Austenitic heat-resistant steel 310S forms a dense Cr2O3 protective oxide film on the surface of the alloy at high temperatures, which is a strong guarantee for its high temperature oxidation resistance and corrosion resistance. However, the stability of the Cr2O3 oxide film is relatively low. Cr2O3 will volatilize in long-term use at temperatures higher than 600 DEG C. In particular, when it contains water vapor, volatile chromium hydroxide is formed, which restricts its application. Phlizon Led Grow Light Promotion
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The Lanzhou University of Science and Technology scholars used manual argon arc welding to weld the 310S heat-resisting steel sheet with an aluminum content of 2% and 4% (mass fraction, the same below). The microstructure of the weld was analyzed using an optical microscope. The element distribution of the welding base metal was analyzed by an electron probe (EMPA), and the mechanical properties of the welded joint at room temperature and high temperature (800°C) were tested. The results show that the microstructure of 310S heat-resisting steel sheet with different aluminum content is good after welding, and there are no defects such as macro-cracks and inclusions; the addition of aluminum element inhibits the abnormal growth of the grains in the heat-affected zone of the welding and refines the grain. The high aluminum 310S welded sheet has the same room temperature mechanical properties and high temperature mechanical properties as the parent metal. Aluminum 310S heat resistant steel has good welding performance.