Summary for heat treating scale prevention Discussion
Selective heat treatment scale prevention is the issue Gene Woelfel raises for thin sheet assemblies (.006"-.186") made mainly from 300-series stainless steel and some nickel alloys. He asks whether a coating can be applied only to certain areas before solution annealing to prevent or reduce scale, since the parts are later welded to other materials and mechanical cleanup is slow and expensive. The excerpt provided contains only the question and no answers, so no specific coating recommendation or removal method is given in the source text. The practical takeaway is that the thread is seeking a selective pre-anneal masking or protection method for areas that must remain cleaner after heat treatment, but the excerpt does not document a confirmed solution.
Q. Is there any type of coating that can be selectively applied (prior to heat treatment), to specific areas that would prevent or minimize the resulting scale formation following solution annealing? Assemblies are sheet materials (.006″-.186″). During the course of manufacturing we are required to solution anneal stainless steel (300 series primarily), and various nickel alloys. Subsequently these sheet metal components are welded to other materials, mechanical removal is quite slow and costly.
Gene Woelfel
– New Braunfels, Texas
2002