NACT plate

[Jayesh Parekh]

i purchase SA387 plate in NACT condition. But in my fabrication process i have to give one intermediate normalizing. So, this intermediate normalizing cycle also follow NACT cycle ? Or i only normalized and then tempered material, it will ok or Not ?

[Ramin Kondori]

Dear Jayesh:

NACT is Normalizing and Accelerated Cooling & Tempering. The Accelerated cooling is critical (by air blasting or quenching) but it all depends on final results. If mechanical properties of the final product meet your min. requirements, there should not be anything to worry about. Accelerated cooling is crucial for preventing grain growth and if you decide to just proceed with cooling in air, you might run into problems with your final assembly.

Regards 

Ramin  Kondori

Sr. QA/QC & Welding Engineer

-----------------------------------------------------------

PG-Dip. in Welding Engineering (IWE  AT  0070)

BSc. in Civil Engineering (IUT)

BGAS Painting Inspector

ASNT Level I&II

                        

On Tue, Jun 26, 2018 at 3:07 PM Jayesh Parekh <jayeshp...@gmail.com> wrote:

i purchase SA387 plate in NACT condition. But in my fabrication process i have to give one intermediate normalizing. So, this intermediate normalizing cycle also follow NACT cycle ? Or i only normalized and then tempered material, it will ok or Not ?

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[Prasad Ghanekar]

NACT or Norm and Temp. both ok

if mechanical properties are within acceptable limit after HT. 

Adviced to simulate HT on test coupon and carry out mechanical tests. Then decide final HT on componant. 

Regards, 

Prasad G. 

On Tue, 26 Jun 2018 16:07 Jayesh Parekh, <jayeshp...@gmail.com> wrote:

i purchase SA387 plate in NACT condition. But in my fabrication process i have to give one intermediate normalizing. So, this intermediate normalizing cycle also follow NACT cycle ? Or i only normalized and then tempered material, it will ok or Not ?

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[PGoswami]

Jayesh,

 

Your query does not mention SA 387  grades and thickness. Assuming this is for SA 387 Gr 11 , NACT  typically applied and is beneficial for plate thickness over 2”. It’s a special heat treatment to improve Notch-Toughness of Gr11  steel , which may be a critical issue while fabricating thicker sections of these grades. NACT vs regular normalizing may not have significant issue on tensile properties.

 

You may refer the attached data sheet from Industeel and decide about Hot Forming on NACT plates. Mill’s  recommendation is to follow full heat treatment (NACT) after hot forming.

 

In addition to the data gathered in this forum discussion advice would be to seek the opinion from the Steel Mill also.

 

Incidentally a lead from similar past discussion in this  forum is as below.

 

Appreciate you could share the outcome when convenient.

Thanks.

 

P.Goswami.P.Eng, IWE.

Welding & Metallurgical Specialist

Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/

Email:pgos...@quickclic.net,pradip....@gmail.com

 

https://groups.google.com/forum/#!topic/materials-welding/WZN23gBBTn0