Normalizing Flanges

[Krausen]

Hey all,

Many B16.5 steel flanges I've come across are made from A105N steel. I thought I had read a standard that required all Class 600 & higher rated flanges to be normalized. Looking through B16.5 & B31.4 today I could not find this requirement anywhere. Does anyone know if this is a specific material requirement under any pressure piping standard (B31.3, B31.4, etc.) or regulation (49 CFR 195, 192, etc.)?

Thanks for your help in advance.

 

[metalsguy]

ASTM A105 requires all flanges Class 300 and higher to be heat treated, not particularly normalized. I believe this is more of a ASTM issue rather than ASME.

 

[david339933]

SA-105 requires heat treatment for flanges above Class 300. Not necessarily normalized.

 

[Krausen]

Thank you gentlemen. I should've gone straight to A105 to read up on this. All I have ever seen is A105N on flanges, but it's good to know that normalizing is not the only heat treatment option that is acceptable.

 

[saplanti]

Krausen,

Have a look at the linked document for the need for A105N:

https://www.google.com.au/url?sa=t&...uetGYgpthcW9hU0rIw_YJg&bvm=bv.114733917,d.dGo