Cold Rolling SA387 Gr.91 Plate

[iam42]

Hi,

Does anyone know of any precautions needed for cold rolling Grade 91 Chromoly plate.

The plate will be 3/8" thick and rolled to form a cone with a small diameter of approx. 10" and approx. 20 inches long.

I will PWHT the long seam as normal.

Please note, this cone will not be part of the pressure bearing wall.

Thanks

 

[metengr]

Do you have the load capacity to cold roll this material into a cone? Keep in mind this is high strength plate material. After rolling, I would perform a stress relief treatment, similar to PWHT, to remove forming strains.

 

[iam42]

Thanks metengr,

As always, you reply with great sense.

I have just read ASME Sec. 1, PG-20. I am going to study this a bit more and will make my decision based on this.

Thanks Again.

 

[racookpe1978]

Do your weld prep of the two edges (the butt weld joint) before rolling.

If you're going to make a bunch of these, several grinding companies have hand-operated edge bevelers that will save a lot of time over hand-grinding.

 

[weldstan]

This appears to be a pretty tight bend, inducing strain > 5%. The whole cone should be furnace stress relieved per metengr. It could be done after long seam welding.