[MW:5250] Isothermal Annealing in place of normalising & Temperig

Dear All,

One of the vendors is giving Isothermal annealed pipes for pipe material A335 P22, P5 & P9 against our requisition requirement of Normalizing & Tempering.
As per ASTM the same is acceptable.

However, i will like to know the difference in the end product because of this different heat treatment.
Also; if some one can comment on the acceptance of the isothermal annealed pipes in place of normalised & tempered pipes.

Thanks & Regards,
Dhwani Desai
Planning & Piping Dept.
Ext.-7681

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