Thursday, January 31, 2013

Re: [MW:16648] Effect of High amount of manganese in chemical composition

Dear Expert,

As the note b says Mn upto 1.60% max. permitted, pls see the note carefully for reduction of carbon & increase of Mn

 For each reduction of 0.01 percentage point below the specified maximum for carbon, an increase of 0.06 percentage point above the specified maximum for
manganese is permitted, up to a maximum of 1.50 % by heat analysis and 1.60 % by product analysis.



Regards,

Vijay Patre


On Tue, Jan 29, 2013 at 10:42 PM, Edward D'Almeida <edalmeida28@gmail.com> wrote:
Dear Farhang,
                    Mn upto 1.60% max. permitted as per note b of the table of the standard and your material perfectly acceptable. No need to think much on this.
Regards,
Edward

On Mon, Jan 28, 2013 at 2:27 PM, Farhang <hyperm2m@gmail.com> wrote:

Dear All

I have tested a specimen of A 516 Gr. 70+Normalized (thickness: 10mm) for chemical analyze, impact, tensile & metallographic.

 Tensile & Impact were acceptable, but i have problem in chemical analyze as follow:

 ü Tensile Strength:

Fy: 360 Mpa     UTS: 531  Mpa

 ü Impact Test:

absorbed energy in impact: 150 j    (sub size 7.5*10*55) – it was very good

 ü chemical analyze:

C:0.09/Mn:1.534/Si:0.35/P:0.005/S:0.005/Cr: 0.069/ Ni: 0.046/ Cu: 0.01 /Mo:0.013/ Cu: 0.104/ V:0.055 /W:0.0026 /Ti: 0.027 /AL:0.042/ Sn:0.001/1 Pb:0.0002/ As:0.002/   Sb:0.0023/ Zr:0.0015/ Nb:0.0475/ Ca: 0.0031

 But according to standard ASTM A516(attached) Mn shall be 0.79~1.30 but here   Mn% is over. It was 1.53%  .

 

I need to know the effect of this discrepancy???

Does it important?

Isn't carbon% very low????????

What is high amount of manganese could be causes?????

 

M. Farhang

hyperm2m@gmail.com 

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Best Regards,

Vijay patre

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