[MW:16619] Effect of High amount of manganese in chemical composition

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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