Re: [MW:5469] How to control the hardness in P22

Hi.

cover and Preheat at 350 oF minimun and let cool very slowly, rate 50 oF per hour, used heat treating machine for major parameter control.

 

Agustin

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De: Jimmy Nielsen <nielsen.jimmy@gmail.com>
Para: materials-welding@googlegroups.com
Enviado: mar, junio 8, 2010 3:04:45 AM
Asunto: Re: [MW:5460] How to control the hardness in P22

Cover the weld with insulation and let it cool slowly.

Regards, jimmy

On 8 Jun 2010 14:02, "mahendran p" <pmahe_79@yahoo.co.in> wrote:
> Hi all,
>          May any one tell me, how to control the hardness of the P22 materials welding without PWHT. Even, we do pre-heating as per the ASME 31.3 & also we use 2.6mm dia electrode(E9016/8). Still we get the hardness around 290 HB.
>  
> Any suggestions to control the hardness within 241 HB(ASME 31.3).
>  
>  
> Please help.
> Thank you.
> Best regards,
> P.Mahendran
>
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