How to prevent sigma phase embrittlement on welds for 304H SS in high temp service

[jtseng123]

Dear all,

Can anyone provide some guidelines how to prevent sigma phase embrittlement on welds for 304H SS.

This is for part in 1450 degF design temperature.

 

[XL83NL]

[ol 1]
[li]API RP 571 (2011), section 4, para 4.2.6. Prevention/mititgation is detailed in 4.2.6.6[/li]
[li]WRC 489 (2004), section 4, para 4.2.6 (essentially the same as 1. above).[/li]
[/ol]