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Re: [MW:4536] Why maximum PWHT temp shall be at least 20°C less than tempering temp.

By Materials & Welding
The intention to keep PWHT temperature below (2o Deg C or 50 Deg F) then the Tempering temperature of plates to ensure that the properties (such as tensile, impact and hardness) obtained after tempering (during plate manufacturing stage) remain unaltered.


C. K. Purohit
Eng-Tech Weld1
Sr Welding Inspector


On 8 March 2010 10:10, Pradip Patil <pradipp@godrej.com> wrote:

Dear Sir,

Why maximum PWHT temp for CS and Low alloy steel materials shall be at least 20°C less than tempering temp?

With Regards,

Pradip Patil.

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