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Ring Joint hardness

Ring Joint hardness

Ring Joint hardness

(OP)
Hi,

For a 2500# RTJ the specification request GASKET,RTJ,8IN,2500#,CS,OCTAGONAL,R51 (Low Carbon Steel) and we received GASKET,RTJ,8IN,2500#,SI/LCS,OCTAGONAL,R51 (Soft Iron, according with Materials Table; the hardness for Low Carbon Steel is 120 Brinel and for Soft Iron is 90 Brinel. I know from standar that the hardness of the ring shall be lower than that of the flange. But the question are the following:
What would be the consequences caused by usisng Soft Iron instead of Low Carbon Steel?
How could this difference in hardness affect the sealing integrity of the joint?

Best regards.
MAD

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