Can i get details Carbon Steel Pipes PWHT Requirement for SOUR Service
Awaiting your details please
Regards
Peranish
On 11/4/10, pgoswami <pgoswami@quickclic.net> wrote:
> Limesh,
>
> For sour service application involving MR-0175, the maximum Nickel content
> in the weld and BM is restricted to 1%. It had been there for many years.
> Though there had been many theories behind the restrictions, it's difficult
> to find proven work , behind this restriction. Addition of Nickel in C-Mn
> steel is thought to cause the following:-
>
> 1.
>
> formation of acicular ferrite, which is desired for good toughens
> and strength.The optimum limit of Nickel to get these properties at the
> best level is generally 1% max.
> 2.
>
> Polygonal or soft ferrite, this is the basic nature of
> ferrite.Polygonal ferrite turns to acicular with more addition of nickel.
> 3.
>
> Martensite and austenite constituent.- With increase of Nickel
> beyond 1%, more and more martensite +austenite phases would form in the
> weld. Note Nickel is a strong austenite forming element. Following heat
> treatment this(martensite+austenite) will transform to Carbides+ferrites and
> cause an increase of hardness, and makes weld more prone to SSC, which is
> not desirable for sour service.
>
> Based on the various experiences the last one(item 3) is considered to be
> highly undesirable, hence the 1% restriction still stands.
>
> The attached paper provides good fundamentals( that's my feel) on the same
> issue.
>
> I hope you would enjoy this.
>
> Thanks.
>
> Pradip Goswami,P.Eng.
> Welding & Metallurgical Specialist & Consultant
> Email-pgoswami@ <mailto:sympatico.capgoswami@quickclic.net> sympatico.ca,
> pgoswami@quickclic.net
>
>
> _____
>
> From: materials-welding@googlegroups.com
> [mailto:materials-welding@googlegroups.com] On Behalf Of limesh M
> Sent: Wednesday, November 03, 2010 10:29 AM
> To: Materials & Welding
> Subject: [MW:8056] Re: consumable containing more than 1% nickel in sour
> environment
>
>
> Dear All,
>
> I have searched a lot and reviewed many articles.Unfortunately I couldn't
> find any proven direct correlation between SSC and Nickel from those
> articles !!! Almost all reference materials simply says nickel percentage is
> restricted to 1% by NACE MR0175 and discussing more about hardness!!!Anybody
> having any research paper on nickel effect and SSC?
>
>
> Regards,
>
> Limesh
>
>
>
> On Mon, Nov 1, 2010 at 8:22 AM, limesh M <limesh78@gmail.com> wrote:
>
>
> Dear All,
>
> Most of the client specification banned usage of consumable containing more
> than 1% nickel in sour environment.What would happen if we use consumable
> having more than 1% nickel?
> If any damage will be the result,how it happening?
>
>
> Regards,
>
>
> Limesh
>
>
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