I am not an expert in this field but
1) if you are planning to make a flange out of a plate then design aspects shall be thoroughly checked. Thicknesses will be very high. (Check for the prying forces). Method of rolling is not a major issue becoz a fianl heat treatment will be done to meet the specification requirements but ensure the tests made on the plate meets all the properties mentioed in the specification. Test specimens shall be suitably selected from the hub of the flange to establish the properties.
2) Flanges are generally prepared by ring-forging technique. Billets are perpared from ingots by open die forging then upsetting followed by ring forging. THis operations are done in hot conditions (Hot working ) followed by suitable heat treatments to meet the mechanical properties. Again heat treatment and selection of test specimens are impportant to check the properties of the material/ flange.
For a clear idea, I prefer speaking to the vendor having the rolling/ forging machines.
For a clear idea, I prefer speaking to the vendor having the rolling/ forging machines.
Regards,
Ravi Kumar.
On Wed, Mar 2, 2011 at 12:36 PM, lalit malpure <lalit_malpure1982@rediffmail.com> wrote:
Dear Mr. Ravi
i want to make a flange for autoclave shell
that is shell ring
what will be the rolling method for SA 516 Gr 70 plate??
On Wed, 02 Mar 2011 02:44:39 +0530 wrote
>Dear Mr Lalit,
Recrystallization temperature is the temperature at which the elongated grains reorient themselves in to fine equaixed grains leading to isotropic properties.
During hot working methods (carried above recrystallisation temperature), recrystallization occurs instantaneously and yields isptropic properties. During cold/ warm working methods (carried below the recrystallisation temperature), temperature is not sufficient to recrystallise the grain and leads to anisotropic properties. Hence separate heat treatment need to be done to restore the properties.
Coming to surface finish, cold working method yields better results while hot working methods yields good thickness tolerances.
Hot/ Warm/ cold working methods (Forging, Rolling, Extrusion) for a particular material is decided based on the machine and heat treatment capacities.
Regards,
Ravi KumarOn Tue, Mar 1, 2011 at 2:01 PM, James, GeraldJayakumar wrote:
Rolling is the process by which the plates are formed to desired size and profile by forcing the billets/plates through Rollers. If the rolling is performed at room temperature/low temperature then it is known as Cold Rolling. If the plates are rolled at High temperature beyond the Recrystallisation temperature then it is known as Hot Rolling.
J.Gerald
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of lalit malpure
Sent: Tuesday, March 01, 2011 12:09 PM
To: materials-welding@googlegroups.com
Subject: Re: Re: [MW:10063] Re:ROLLING
but what is the rolling method means hot/cold,
what is the difference???
On Tue, 01 Mar 2011 08:46:21 +0530 wrote
>Nowadays plates come with cross rolling, they are rolled at 90degrees in consequent rolling operations.
2011/2/28 sandy
Hi
The main reason is that the mechanical properties are better in the
rolling direction compare to transverse direction.
But it is not mandatory that you weld in this way.
If you weld the material in the way wht u r asking may be possible
that you will get lesser strength or other required things
as compare to long. side welding.
Regards
Sandeep
On Feb 28, 5:29 am, "Kathalingam Babu"
wrote:
> Hi
>
> It is only optional, not mandatory in many codes.
>
> Due to the fact that, there is variation in mechanical properties in Trans
> direction.
>
> Thanks & Regards,
>
> K. Babu
>
>
>
> ----- Original Message -----
> From: "Pratik Kshirsagar"
> To: "Materials & Welding"
> Sent: Sunday, February 27, 2011 12:08 AM
> Subject: [MW:10030] basic funda
>
> > Dear all,
> > I am having a simple question which seems to be stupid but
> > just it's the basic thing. I want to know why to weld a plate in the
> > direction of rolling? What happens if the welding is carried out in
> > transverse direction that of rolling?
>
> > --
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> > w.r.t. applicable code/standard/contract documents.- Hide quoted text -
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> - Show quoted text -
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regards,
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