SA 302 grade C drum manufacturing

[qaqceng]

Hi,
I'm looking for anyone familiar with using SA 302C plate material for drums or pressure vessels. Are their any procedure recommendations for rolling or forming this material for drum shells and heads? I realize code requires this material to be PWHT when welded, but I am more interested in heat treatments used before, during and after rolling and forming of the plate. Is it common to apply heat, re-normalize, or anything of the sort?

Any help would be appreciated.

 

[metengr]

The SA 302 alloy steel grades are similar to the common SA 533 alloy steel grade materials. Forming is based on equipment capability and heat may be necessary. As far as thermal treatments, this is a P-No 3 base material, so PWHT requirements are defined and fiber elongation from forming is defined. Above a certain level of forming strain, post forming heat treatment like those described in UCS-56 may be necessary.

 

[weldstan]

It is not common to normalize after roll forming plate. Because the thickness is often such that PWHT is required, the shell will be subject to PWHT and stress relief will be obtained when fiber elongation is such that stress relief after forming would be required.

Caution: Manganese- Nickel- Molybdenum alloys have higher hardenability than Carbon-Molybdenum alloys and greater preheating will be required, especially for thick items to eliminate cold cracking. Also these alloys have a much greater potential for temper embrittlement at high operating temperatures than C-Mo alloy steels.

They can be manufactured to provide high toughness at temperatures below -50F in heavy wall thickness.