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RE: [MW:6839] Stabilized heat treatment

By Materials & Welding

Dear Mr. Das,

ASME code gives two options for cooling the object after stabilizing heat treatment.

1. Furnace cooling
2. Air cooling.

Above requirement is being defined as supplementary requirement of different product specifications. Like to add that, these are only supplementary requirements and to be agreed when specified by purchaser. But, in broader sense, it is a code requirement.

The cycle is defined as Temperature - 1500 -1600 deg F , soaking 2 Hrs/ Inch and cooling in furnace or air.( Refer Supp. requirements  S 10 - A 182, S -10 A 403 for further details.)

 Like to share, that product specification for pipes and tubes, ( S -6 of A 312, A 213) indicates that stabilizing heat treatment cycle ( particularly temp.)  to be agreed between  purchaser and manufacturer.

But process licensors like UOP, AXEN recommends to carry out stabilizing heat treatment at 900 C for 4 hrs of soaking time, furnace or air cooling.  This cycle has proven to be ideal cycle for purpose intended.

With Best Regards,

Jignesh R Rana
Manager - QA & QC

Linde Engineering India Pvt. Ltd.
38, Nutan Bharat Society, Alkapuri, Vadodara 390007, India
Tel.: +91 265 3056789, Fax: +91 265 2335213 , Mobil:  +91 90999 86019
jignesh.rana@linde-le.com, www.linde-india.com

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"Kavathekar, Sachin" <Sachin.Kavathekar@jacobs.com>
Sent by: materials-welding@googlegroups.com

03/09/10 11:19

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RE: [MW:6838] Stabilized heat treatment





Quench in water to bring down to temp. 350 degree Centigrade within 3 minutes (max)
 
Regards,
Sachin A Kavathekar
 


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Bathula Raghuram (Mumbai - PIPING)
Sent: Friday, September 03, 2010 10:57 AM
To: 'materials-welding@googlegroups.com'
Subject: RE: [MW:6837] Stabilized heat treatment
 
No cooling media required, after soaking remove insulation and let it cool in air.
 
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of subrata das
Sent: Friday, September 03, 2010 10:51 AM
To: materials-welding@googlegroups.com
Subject: [MW:6836] Stabilized heat treatment
 
Dear Members
What shall be the cooling media for Stabilized heat treatment for grades like SS321, SS347 etc. as per code it is only mentioned that soaking temp. 900 deg.C / soaking time 4 hours.
 
 
Regards
Subrata Das

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