How to determine the manganese content in precision castings

There has always been no unified rule for the determination of manganese content in precision castings, and various methods vary greatly. In order to introduce national standards, this summary is kept for future reference.

To measure Mn in precision castings, you can find relevant national standards, such as GB/T 5121.14-2008 for the determination of manganese content. You can find the detailed answer you need, and there are very detailed steps.

As for what brand of 721 measurement standard is accurate, first refer to which national standard and see which wavelength the actual measurement is taken at. If it is within 360-1000, choosing 721 can solve the problem; otherwise, a UV visible spectrophotometer is needed. If the budget is relatively sufficient, you can choose Japan; If the budget is small, domestic products can be chosen.

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 varying concentrations of c, and then measure the absorbance value A to create a standard curve; Measure the absorbance value of the sample solution you have prepared, and calculate the Mn concentration of the sample based on the curve.

The formula is actually A= ε BC, A was measured by you using a spectrophotometer, and the c of the standard steel is known, which can be used to create an A-c curve. B-liquid layer thickness, ε- Molar absorption coefficient