Purpose of Pre heating are as follows:
1) To prevent Hydrogen Induced cracking- This risk is very high with CS material if thickness is more than 25 mm thick.
2) TO remove moisture and minor dust and dirt
3) It reduces fast cooling otheriwse it results in to unwanted unhealthy mircrostructure.
4) It some time help for distortion control.
Regards
On Thu, May 7, 2009 at 11:20 AM, nilesh <nilesh_parsekar@yahoo.com> wrote:
--- On Wed, 5/6/09, SAUL VASQUEZ T. <svasquez@ingetanques.com> wrote:
From: SAUL VASQUEZ T. <svasquez@ingetanques.com>
Subject: [MW:2114] preheat SA- 516 gr 70
To: materials-welding@googlegroups.com
Date: Wednesday, May 6, 2009, 7:50 PM
Dear all
We are API 650 steel tanks with steel ASTM 516 gr70 and our client requests that preheat to 70°C - 100°C is this correct? The API 650 code section 7-1 that says that preheat at 10°C
thanks all
Cordial saludo
Kind regards
Saul Vasquez T.
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