410 has 0.15% C and 410 has 0.08% but When deposited on CS, it is very likely for the weld metal to become martensitic more than 30% which is unacceptable to some specifications (some accept martensite up to 50%). I believed the same and I did not know that 410S weld may become martensitic until I experienced it during an overlay job (by SAW). That's why we had to choose a low heat input process. We selected Pulsed MIG, literally used the same filler metal and it worked. We managed to achieve the desirable overlay with in one layer.
I need 2 weeks to get home and scan/send you the PQR and test results.On Wed, May 29, 2013 at 9:59 AM, kannayeram gnanapandithan <kgpandithan@gmail.com> wrote:
SS 410S is not martensitic
On 5/28/13, Ramin Kondori <raminkondori@gmail.com> wrote:
> *Dear Branko:*
>> 1. Using a buffer layer (intermediate layer) of E309L or even E310L on
> Depositing AISI 410S on A516 will produce a martensitic weld overlay which
> is prone to cracking even during welding. There Are two solutions:
>
> A516 and then Depositing 410S> 2. Applying preheat of min 250-300 C which makes it a very hard job
> though it may seem less expensive> *Ramin Kondori*
>
> In first scenario, you do not need any preheat but I do not recommend using
> SAW for 410S layer since it may melt through the buffer layer and reach
> A516 which maybe, maybe causes problems. You can use GMAW with Ar+2%o2 or
> Ar+3%CO2. Do not forget the Preheat...
>
> This way your weld overlay will be thicker than 3 mm and you should weld a
> PQR coupon to make sure you have 3mm of 410 weld layer "over" the buffer
> layer. Maybe you'll have to deposit one buffer (309L or 310L) and 2 layers
> of 410S. Try using Pulsed GMAW to get the results with depositing one
> layer.
>
> One of our colleagues have successfully deposited one layer of 410 weld
> overlay on A516 using Pulsed-MIG (Preheat is essential). It's because
> Pulsed-MIG has less dilution and you may achieve required results in one
> layer.
>
> For PQR, you need 4 side bend tests, chemical analysis on the surface of
> overlay and 3-4mm below the surface, and hardness test (on the surface).
>
> Discuss these issues with your client before proceeding.
> Good Luck
> *Sr. QA/QC Engineer
> *
> *SINOPEC*
>
> r.kondori@petroyada.com
> +98-2123592322
> +98-9132150320
>
>
> On Mon, May 27, 2013 at 4:37 PM, Branko Ferencak <bran2605@gmail.com>
> wrote:
>
>> I have shell 20mm thick ( SA-516 Gr, 60 ) and there must be cladd AISI
>> 410S 3mm
>> Could anybody tell me which filler i can use, for SAW and GMAW?
>> GMAW i planning use for flanges and tubesheets ( after i overlay
>> tubesheet - what is procedure for welding tube to tubesheet? )
>> Also PWHT has been asked by customer after overlay.
>> Can anybody tell the effect of PWHT on SS 410S overlay?
>> What will be the the safe range of temperature of PWHT? ( Also
>> recommended temperatures and times, holding cooling...)
>>
>> Best regards,
>> Branko Ferencak
>>
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