WRONG PWHT APPLIED TO VALVE?

[Jason123456789]

I have a carbon steel valve with flanges welded one and the wrong heat treat procedure applied to it. The heat treat procedure used holds the temperature at 1550-1650 F for 45 minutes then removed and quenched in oil, until cool. The parts are then tempered in 1000 - 1200 f range for 2 hours to obtain hardness of Rc 28-36.

The correct procedure places the components in a furnace at 800 F, and increased to 1100-1200 f for 15 minutes per inch of weld thickness. After reaching 800, it is cooled in still air.

Is there something I can do, or should the part be scrapped.

Thanks!

 

[duane656]

Hi Jason,

That sounds like a really tricky problem you have there. I would think you might be better heading over to the Materials Engineering forum with this question (Metal and Metallurgy section. As well as talking to a local Materials Engineer. They might be able to advise if the material is going to still comply with what is required.

I will add though that if there is any doubt that the material does not meet your requirements then I would scrap it without a second thought.

Duane
Piping and Valve Engineer - Oil & Gas