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Re: [MW:34884] PWHT of Normalized head

By Materials & Welding
Hi
Generally CS sa516 plates supplied in.NR condition i.e heating to above Ac3 about 900c and cooled in still air

As per ASME code Welded vessel above above 38mm nominal thk.req PWHT below Ac1as per UCS56 of course for sour /lethal service all the Vessels req PWHT irrespective of.nominal thk.

Regards
Hegde Prakash


On Tue, 16 Apr 2024 at 12:48, Muhammed Ibrahim PK
<ibratech@gmail.com> wrote:
PWHT required specific holding time and controlled cooling as per sec VIII Div.1. Normalizing having air cooling after reaching at 900 deg c.  Since normalizing not required specified holding time and controlled cooling, will it substitute ?

Thanks & Regards
Muhammed Ibrahim PK


On Mon, 15 Apr 2024 at 7:59 PM venkateswara reddy Desireddy <dvreddy82@gmail.com> wrote:
Hi, 
If you heat treated 900°C , then no need to do 610°C. 

On Mon, 15 Apr 2024, 4:05 pm anthony chundal, <anthony.chundal@gmail.com> wrote:
Hi

PWHT is required for 45 thk, normalizing is separate heat treatment and cant be combined with stress relieving,

Regards,



On Sun, Apr 14, 2024 at 4:56 PM Muhammed Ibrahim PK <ibratech@gmail.com> wrote:
Gentlemen,

Is PWHT can be avoided if the welded head (2 piece construction) performs normalizing after forming ?

Head MOC : SA516 Gr 70, 45 mm thk, fabricated by welding the blank in two pieces. 

Complete vessel not required PWHT.

Thanks & Regards
Muhammed Ibrahim PK

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