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Re: [MW:26441] Difference between A350 LF1 and LF2

By Materials & Welding
The difference is that the Class 1 is impact tested to -50°F, which can be used for low temperature service not lower than -50°F

On Sat, Apr 15, 2017 at 8:21 AM, Himan Nikdin <himan.nikdin@outlook.com> wrote:

Dear Pradip


Thank you for reply, but actually my doubt is still remain, as you can see in Table SA-350 there is no difference between LF1 and LF2 grades in chemical composition range, so I have confused about mechanical properties (as you mentioned tensile and impact properties), meanwhile as I already stated in my 1st email, this difference in impact test is also in two class of LF2, I want to know the reason for these differences despite of similar chemical composition.


Regards,

Himan Nikdin

From: materials-welding@googlegroups.com <materials-welding@googlegroups.com> on behalf of PGoswami <pgoswami@quickclic.net>
Sent: Saturday, April 15, 2017 1:57:31 AM
To: materials-welding@googlegroups.com
Subject: RE: [MW:26414] Difference between A350 LF1 and LF2
 

Hi Himan,

 

Please look at the extract from Table-2 of Specification SA350.

 

Although the compositional requirements are overlapping, 350 LF1 closer to P1Gr1 material(e.g. SA 516/60, plates), while 350LF2 is closer to P1 Gr 2 material(e.g. SA 516/70, plates).

 

It's the compositional differences, lower C and higher Mn which makes major differences in the properties for these grades of forgings.

 

Also if you look at Table-3, you'll note there are differences in the required  impact test values(Full Size specimen) for both materials.

 

Hope this will clarify your doubt.

 

Thank.

 

 

P.Goswami.P.Eng, IWE.

Welding&Metallurgical Specialist

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

Email:pgoswami@quickclic.net,pradip.goswami@gmail.com

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Himan Nikdin
Sent: April 14, 2017 3:44 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:26410] Differnce between A350 LF1 and LF2

 

Dear George

 

I do not disagree with you, but different grain size is achievable by different chemical composition and/or heat treatment, but I can't find any different chemical composition or heat treatment.

 

Regards,

Himan Nikdin

From: materials-welding@googlegroups.com <materials-welding@googlegroups.com> on behalf of George Dilintas <dilintas@gmail.com>
Sent: Wednesday, April 12, 2017 10:44:39 PM
To: Meghanadh K
Subject: Re: [MW:26403] Differnce between A350 LF1 and LF2

 

Grain Size

 

2017-04-11 16:59 GMT+03:00 Himan Nikdin <himan.nikdin@outlook.com>:

Dear Experts,

Good Day!!

 

I have query regarding SA350 LF1 and LF2, as you can compare the chemical composition of two grades, there are no difference between two grades;

but you can see the major difference between impact test temperature, what is the reason for this major difference as in SA-350 there is no major heat treatment requirements.

also what is the reason for difference between impact test temperature of LF2 Class 1 and class 2?

thanks indeed if you share your valuable ideas.

 

Regards,

Himan Nikdin

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Dr. Georgios Dilintas,

Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

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