Saturday, March 5, 2011

RE: [MW:10146] SA264- Heat treatment of Cr-Ni Steel clad plate

Mr. Bathula,
 
The following attachment gives a good illustration on clad plates through roll bonding process. Usually clad plates manufactured through the process of roll bonding will require heat treatment (solution anneal mid temperature zone , 900-950 deg C to solution anneal,  austenitic clad and normalize the backing the backing steel) followed by tempering. The slides @ page 17 & 25 illustrates those facts.
 
Regarding  the clauses of SA-264 you'd mentioned here, 5.2.1 is clear and applies exclusively for roll bonded clad plates. While 5.2.3  would be more appropriate for explosive bonded clad plates.
 
Thanks.
 
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist & Consultant
Ontario,Canada.
Email-pgoswami@sympatico.ca,
 

5.2 Heat Treatment:

5.2.1 Unless otherwise specified or agreed upon between the purchaser and the manufacturer, all austenitic stainless steel clad plates shall be given a heat treatment consisting of heating to the proper temperature for the solution of the chromium carbides in the cladding followed by individual air cooling. For base metals of air-hardening low-alloy steels the above heat treatment shall be followed by a tempering treatment.

5.2.3 When plates are to be cold formed, or when otherwise required by the base metal specification, the purchaser may specify that such plates, following solution annealing, be heat treated for grain refinement of the base metal by normalizing and either air cooled or water quenched as appropriate. In the case of clad plate manufactured without hot rolling, the base metal and alloy cladding components may be heat treated separately as appropriate prior to bonding.

 


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Mathusoothanan Subramaniam
Sent: Thursday, March 03, 2011 4:32 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:10114] SA264- Heat treatment of Cr-Ni Steel clad plate

Normally, during manufacturing of clad plates, hot rolling is being done at a temperature range of 600ºC to 950ºC. In temp. range of 600 to 910º, there is a chance for reduction in corrosion property of SS clad material except "L" grades. Above 910 and upto 950ºC, there is a chance for reduction in mechanical properties of base plate. Some Clients asks for garanteed  mechanical property after SPWHT. In that case, there is a chance for failure of meeting the requirement of mechanical  properties. Hence, the mill (Clad manufacturer) may deny to supply. The only option to procure cladded plate is as per clause 5.2.3.
 
 
range,
On Thu, Mar 3, 2011 at 10:05 AM, B.Raghuram <raghurambathula@gmail.com> wrote:
It is not clear to me, when i specify 5.2.3. what additional HT we get?
if you could may give a specific case pl.

-----Original Message-----
From: ravi
Sent:  03/03/2011 12:27:53 pm
To: materials-welding@googlegroups.com
Cc: Raghuram Bathula
Subject:  Re: [MW:10105] SA264- Heat treatment of Cr-Ni Steel clad plate

As per Cl No.5.2.1, for all *AUSTENITIC Stainless Steel *composite plates
(i.e., clad plate + base plate) heat treatment is mandatory to dissolve the
carbides in the cladding.

As per Cl No 5.2.3, heat treatment is optional.
If required composite plates may be heat treated depending on the *Clad
material*, variation in grain sizes/ mechanical/ corrosion properties,
service requirements/ application.
Also as Mr Subramaniam said, plates may be separately heat treated prior to
explosive bonding.



On Wed, Mar 2, 2011 at 9:42 PM, Raghuram Bathula
<raghurambathula@gmail.com>wrote:

> that is any way done as per para 5.2.1, what is the significance of para
> 5.2.3?
>
>
> On Wed, Mar 2, 2011 at 6:27 PM, Mathusoothanan Subramaniam <
> smathu73@gmail.com> wrote:
>
>> Without hot rolling ie. if the clad plate manufactured by explosion
>> bonding, the base metal and alloy clading components may be heat treated
>> separately prior to bonding.
>>
>>
>> On Tue, Mar 1, 2011 at 1:35 PM, Bathula Raghuram (Mumbai - PIPING) <
>> R.Bathula@ticb.com> wrote:
>>
>>>  In general clad plates produced as per SA264 are heat treated as per
>>> para 5.2.1 (i.e. either normalizing or normalizing and tempering depending
>>> on the base plate), however can anybody clarify the requirement of para
>>> 5.2.3 (when it is applied, the application of cold forming or without hot
>>> rolling)
>>>
>>>
>>>
>>> *"5.2.3 *When plates are to be cold formed, or when otherwise required
>>> by the base metal specification, the purchaser may specify that such plates,
>>> following solution annealing, be heat treated for grain refinement of the
>>> base metal by normalizing and either air cooled or water quenched as
>>> appropriate. In the case of clad plate manufactured without hot rolling,
>>> the base metal and alloy cladding components may be heat treated separately
>>> as appropriate prior to bonding.*"*welding@googlegroups.com
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