There is no uniform rule for the determination of manganese content in precision castings. Various methods are very different. For the promulgation of national standards, they are summarized and stored here in case they are needed. To measure Mn in Precision casting, you can find relevant national standards, such as the determination of manganese content GB / T 5121.14-2008, you can find the detailed answer you need, and there are very detailed steps. As for what brand of 721 measurement standard is correct, you first refer to which national standard and see at which wavelength the actual measurement is made. If it is within 360-1000, selecting 721 can solve the problem, otherwise UV-visible spectrophotometry is required meter. If the budget is sufficient, you can choose Japan; if the budget is small, you can choose domestic. Simply put, the Mn content of the standard steel in precision castings is given and known. After processing the standard steel, you prepare a series of solutions with different concentrations c, and then measure the absorbance value A to make a standard curve; Measure the absorbance value with your prepared sample solution, and get the Mn concentration according to the curve, then you can estimate the Mn content of the sample. The formula is actually A = εbc, A is measured by a spectrophotometer, c of the standard steel is known, and an A-c curve can be made. b- thickness of liquid layer, ε-molar absorption coefficient.

1. Does precision casting have to be manufactured by precision casting? Can it be used to produce thin-walled castings? The manufacturing process of precision castings is precision casting, which is without a doubt. However, this process can also be used for the production of thin-walled castings, in which the outer casing of the mold needs to be preheated at a high temperature, and the solidification speed of the metal during the casting process is very slow. It is therefore suitable for the production of thin-walled castings. 2. Does the precision casting need heat treatment? Can stainless steel be used as casting raw material? Whether the precision casting needs heat treatment depends on the actual conditions and specific requirements of the casting. If you want to further improve the performance of the casting, you can achieve this by heat treatment. However, it is necessary to rationally select the materials and select the appropriate process to achieve good results. As a good material, stainless steel can be cast by precision casting. 3. What should I pay attention to if I produce such castings in large quantities? Classification of castings? If the production of precision castings is mass-produced, care should be taken to adopt appropriate, advanced styling and coring methods to increase work efficiency and obtain high quality products. The classification of castings is generally horizontal casting and vertical casting.