What is the reason to do the normalizing after hot forming @ 900F? The hot forming may be around the normalizing temperature (or slightly lower) of base metal (SA516-70).
At this time, the clad 321 SS which is exposed to high temperature for a certain time or above is not completely immune from the sensitization or sigmatization (reheat/ stress relief cracking).
So I would prefer to delete the normalizing after forming if there is not a specific reason of the requirement.
If you need a further discussion, please email me.
Normalizing을 해도 지금 걱정하시는 수준의 문제가 발생하지는 않습니다.
물론 엄청나게 오랜 시간동안에 고온에서 붙잡고 있고, 이 재질을 냉각하는 과정이 부적절하다면 문제가 생길 수도 있겠습니다만, 그럴 일은 별로 없습니다.
다만, 박리와 변형등의 문제는 어차피 집고 넘어가야 하겠지요.
요즘 이런 식의 Spec. Requirement를 자주 접하게 되는 데, 솔직히 왜 꼭 이래야만 하는 가에 대해서는 많이 생각을 해 볼 필요가 있습니다.
At this time, the clad 321 SS which is exposed to high temperature for a certain time or above is not completely immune from the sensitization or sigmatization (reheat/ stress relief cracking).
So I would prefer to delete the normalizing after forming if there is not a specific reason of the requirement.
If you need a further discussion, please email me.
Thomaseun@hanmail.net