No need to preheat such low thickness. Waste of energy and natural resources !
Only see that ur ambient temp. is min.16 degrees celcius.
Preheat for CS materials is required only for thickness greater than 25mm.
Also during rainy seasons if u preheat slightly @100degrees C,
it helps in removing moisture absorbed by the plates !
Regards
Prem Nautiyal
Godrej,Mumbai.
On Fri, 08 May 2009 09:36:21 +0530 wrote
> Thickness are 5/8 3/8 5/16 and
>
>
>
>De: materials-welding@googlegroups.com
>[mailto:materials-welding@googlegroups.com] En nombre de Bathula Raghuram
>(Mumbai - PIPING)
>Enviado el: mircoles, 06 de mayo de 2009 11:18 p.m.
>Para: materials-welding@googlegroups.com
>Asunto: [MW:2115] RE: 2114] preheat SA- 516 gr 70
>
>
>
>What is the thickness involved? And what is your atm temperature?
>
>
>
> _____
>
>From: materials-welding@googlegroups.com
>[mailto:materials-welding@googlegroups.com] On Behalf Of SAUL VASQUEZ T.
>Sent: Thursday, May 07, 2009 6:20 AM
>To: materials-welding@googlegroups.com
>Subject: [MW:2114] preheat SA- 516 gr 70
>
>
>
>
>
>Dear all
>
>
>
>We are making API 650 steel tanks with steel ASTM 516 gr70 and our client
>requests that preheat to 70C - 100C is this correct? The API 650 code
>section 7-1 that says that preheat at 10C
>
>
>
>thanks all
>
>
>
>
>
>
>
>Cordial saludo
>
>Kind regards
>
>Saul Vasquez T.
>
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