Stainless Steel Casting The Need
Stainless Steel Casting To meet the needs of domestic and foreign tool market, we must speed up the development of new products, improve product quality, increase varieties, increase production. In recent years, the demand for diamond tools has been increasing year by year in the field of processing of valves, Stainless Steel Casting pumps, marine hardware, auto parts and pipe parts. At present, these products are still dependent on imports in China. Therefore, it is necessary to develop high quality series of tools as soon as possible To replace imports. To ensure the quality of their products, we must speed up the promotion of new technologies and new technologies, such as vacuum welding technology, EDM sintering technology, diamond uniform technology, diamond plating iridium technology and metallization bonding technology, laser welding process.
High voltage and high current density impact method. Stainless Steel Casting That is, in the early stages of oxidation of stainless steel castings on the use of high-voltage shock, so that the part has been oxidized by electric shock and then connected into a film 2, Stainless Steel Casting surface grinding method. This method is to fill the aluminum grinding has been filled with the oxide part of the gap, so that the resulting gap together, as the role of the bridge.
Surface shot peening method. This method is to use a round hammer to beat the gap, by knocking to close it, can be achieved into the film for the purpose. We have to choose according to the degree of contamination of stainless steel casting corresponding to the corresponding method. Stainless Steel Casting According to the relevant information, castings are not cleaned before the pit filled with slag material. Stainless Steel Casting The lithofacies analysis shows that there are chemicals such as ferric silicate, manganese silicate and chromium silicate in the slag material at the defect. The results of electron diffraction show that the black pitting is composed of magnetite (Fe3O4) and iron chrome spinel (FeO · Cr2O3). As a result of the spectral analysis, Stainless Steel Casting the silicon content in the metal component at the defect is increased and the amount of manganese is very small. After the castings are shot blasting and sandblasting, the surface of the casting will have gray and black pits, Stainless Steel Casting which often appear in the local thick section, corner and hole parts of the casting, and even the entire surface of the casting.
Alloy steel casting casting conditions set unreasonable: such as pouring filling process is too long, resulting in pouring process pouring molten steel temperature is low, especially for the casting wall thickness increased position, pouring molten steel solidification speed is slow, Stainless Steel Casting resulting in liquid Phase - solid residence time is longer, which leads to the growth of molten steel and the thermal decomposition products, Stainless Steel Casting and increases the carburization and carbon deposition of cast steel.
Production of alloy steel castings Carbon content in smelting ingredients is not strictly controlled, in particular the carbon content in various scraps and the presence of other alloying materials in various scraps.
Alloy steel casting casting system set unreasonable: especially the vacuum system and casting sand or cast casting process configuration unreasonable, resulting in casting in the casting process, Stainless Steel Casting pouring sand box within the vacuum, Stainless Steel Casting the deviation is too large, Or the actual vacuum is insufficient, and the vacuum pressure gauge is in line with the technical parameters of the wrong value, Stainless Steel Casting so that the appearance of the thermal decomposition products can not quickly and quickly discharge casting cavity, resulting in carburizing or carbon deposition.