Research Committee Report on Spectrograph Set Up Standards
During the past two years the DIS Research Subcommittee on Process Control has been running a comparative study on powered metal set up standards (SUS) produced by ARMI (Analytical Reference Materials International). These standards are not certified for true composition, but since they are made from generally homogeneous powders the entire sample can be used. They should be used for drift correction not curve generation. Typical chemistries are shown in the two tables below.
The DIS tested these two standards at 11 different foundry labs and found them to be statistically acceptable for use. We plan to check with DIS foundry members to see if there are other chemistries needed for set up. If you wish further information or if you want to obtain these standards contact ARMI at www.armi.com.
The standards have the following numbers and chemistries:
