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shiras
Active Contributor

Join Date: Aug 2012
Posts: 10

Tempering & Normalizing

09/18/2012 2:40 AM

For a petro-chemical project, we have the following Heat Treatment requirement. Tempering at 740 Deg C for ASTM A182 F11 Class 1 material. However, the material available in market is Tempered at 620 Deg C which is the basic ASTM requirement. Can Re heat treatment(Normalizing and then Tempering at 740 Deg C) be considered a solution ? Will this re-heat treatment change the physical properties of material beyond the requirement ?
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Joshi
Guru

Join Date: Oct 2007
Location: India
Posts: 1246
Good Answers: 34
#1

Re: Tempering & Normalizing

09/18/2012 3:57 AM

Please take 'micrographs of microstructures' of sample of both material. Then re-heat a sample piece, tempered at 620 Deg C, to 740 Deg C. Take 'micrographs of microstructures' of the re-heat treated sample. Compare the 'micrographs of microstructures' to determine if it compares faithfully with ASTM A182 F11 Class 1 material.
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bm
Active Contributor

Join Date: Nov 2009
Location: India
Posts: 22
#2

Re: Tempering & Normalizing

09/19/2012 1:41 AM

I referred to an ASME version of the same standard i.e., SA 182 F11. There is a provision made for retreatment. So re-heat treating the material is permissible. The mechanical properties will change. Whether the change will be favourable, you may determine experimentally. With the new properties the existing material test certificate will need to be amended.

I will be happy to know what you finally decide upon and the consequent results.
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shiras
Active Contributor

Join Date: Aug 2012
Posts: 10
#5
In reply to #2

Re: Tempering & Normalizing

09/20/2012 7:46 AM

Thanks for the information. I shall refer to the standard. However, our requirement is F11 Class 1 which got the lowest value of hardness among the Classes 1,2 & 3. I doubt on limiting the hardness value within range on re-heating.

Moreover any dimensional variation happen?
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Geoffrey36
Power-User
United Kingdom - Member - Not quite retired Member

Join Date: Aug 2012
Location: Up an araucaria araucana tree, South London, United Kingdom
Posts: 132
Good Answers: 7
#3

Re: Tempering & Normalizing

09/19/2012 4:26 AM

Have you no access to the designer to ascertain his/her purpose?
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shiras
Active Contributor

Join Date: Aug 2012
Posts: 10
#4
In reply to #3

Re: Tempering & Normalizing

09/20/2012 7:21 AM

We are the procurement department of an EPC contractor. The designer has clearly specified their requirements as Tempering at 740 Deg C.
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