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Re: [MW:13767] Heat treatment of WHPY-52 fittings

By Materials & Welding
firstly by the looks of it you want to Quench ,harden the the steel
because you speaking about immidiate immersion.....so when quench
hardening your steel it must be in the range of 920 degrees
celcius.Soak time (time how long the metal must be heated)depends on
thickness ......usually one hour for 25mm thickness and after that
immersion can take place in oil or water.
after that you need to temper it for toughness and thickness at 550 to
700 degrees celcius and air cool.same apply to thickness of material
25mm for one hour....

On Tue, Feb 21, 2012 at 3:35 AM, khatri ankit <nids01dme011@gmail.com> wrote:
> Dear Experts,
>
> I have doubt abt the following clause
>
> Code ref- MSS-SP-75 CLause No-9.1.4- Fitting shall be uniformly
> reheated above the transformation range, held at temp. sufficient to
> achieve uniform temp. throughout the mass and immediately immersion
> quenched in a suitable liquid medium.
>
> Kindly clarify the first line of this clause- Fitting shall be
> reheated above the transfomation range.
>
> What will be transformation range for this?
>
> I need some clarification for the heat treatments for these
> fittings(Temp. of Quenching as well as Tempering)
>
> Kindly explain and justify
>
> Regards,
>
> Ankit Khatri
>
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