Final answer:
The question is about engineering materials, likely involving specifications of metals and cleaning procedures known as 'boil-out'.
Step-by-step explanation:
Your question appears to involve terminology related to engineering processes, specifically materials science or chemical engineering. The terms OFE-321 and CFE-410/420 likely refer to grades or specifications of stainless steel or other alloys used in industrial applications. The term boil-out in this context probably relates to a cleaning process where the material is subjected to high temperatures and possibly chemicals to remove impurities or manufacturing residues. Without more context, it is difficult to provide a detailed explanation, but it appears your question pertains to procedures or specifications related to material composition and treatment in an engineering or industrial setting.