Inspect Thread Rolling

Dear, All
I have no experience of thread rolling.
I want to know how to inspect thread rolling.
Material : stainless steel
Tensile strength : over 1070Mpa
1. NDT
Is it mandatory to inspect flaw using NDT?
2. grain flow
Is it mandatory to inspect grain flow?
How to inspect grain flow?
What is the criteria for inspection?
Is grain flow important to thread rolling?
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Thread rolling is the superior technology for thread forming. If the profile is good, then the properties will be good. What is mandatory is given by a test specification. This should detail methods
Brian Whatcott Altus OK
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Brian Whatcott

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