[MW:27052] Re: Welding after PWHT on SA335 P11 coil

Thanks a lot Dennis for precise reply. I can conclude now that in our case no further heat treatment is required. But, have one more doubt below.

ASME SEC II Part A, Specification SA-335/SA-335M, Clause 5.3.1 says "All pipe shall be reheated for heat treatment and heat treated in accordance with the requirements of Table 2". Per Table 2, grade P11 shall be Normalized & Tempered @ 650°C. Also note 4 given just below clause 5.3.1 says "Certain of the ferritic steels covered by this specification will harden if cooled rapidly from above their critical temperature. Some will air harden, that is, become hardened to an undesirable degree when cooled in air from high temperatures. Therefore, operations involving heating such steels above their critical temperatures, such as welding, flanging, and hot bending, should be followed by suitable heat treatment".

Does "Certain of the ferritic steels" covers grade P11?

On Wednesday, 22 November 2017 17:11:49 UTC+5:30, Makrand Sakpal wrote:

Dears,

We have ordered fired heater in which coil material is SA335 P11. Coil size is 6" x SCH 40 (i.e. 6.625" OD x 0.28" THK). These coils are PWHT'd. Issue is, our vendor forgot to weld the thermocouple RF pads on the coil before PWHT. What needs to be done further if we weld the RF Pads on the already PWHT'd coils? Do we need to do PWHT again for that particular joint?

Please let us know your opinions.

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