Hardness Diferrence Between Ring Gasket and Flange 316

[robertogrramos]

thread330-334986
Hello all!

I have the same question as the thread referenced.
The situation is, ASME B16.20 defines the maximum hardness for 316 rig-joint gasket 160BHN.
But flanges ASTM A182 F316L does not have a hardness requirement.
So how can I know the difference of hardness between the gasket and the flange to make sure that the flange ring groove won't be danified at the bolt tightening?

 

[Dhurjati Sen]

Check the hardness of the flange. It should be within 160 BHN.

DHURJATI SEN

 

[TugboatEng]

316L SS is not hardenable by heat treatment. That gives it a narrow range of hardness available. Find that range and assume the lowest value for your calculations.