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Light Element Limitation Example

Undetected light elements in alloys example.  Consider two iron alloys, a cast iron and a steel grade, both having 0.5-0.8% manganese in the specifications. Both of these grades would be expected to analyze as ~99.2-99.5% Fe and ~0.5-0.8% Mn because the other elements would be invisible (in the case of P and S in this matrix and at this concentration level).  However, the %iron content actually differs by ~6%

UNS_F10004, Grey Cast Iron HB  

 C:   3.4-3.7%

 P:  0.0-0.25%

S:  0.0-0.15%

Si:  2.3-2.8%  

Mn:   0.5-0.8%

Fe:  92.3-93.8%

 

UNS_G11080, Resulfurized Carbon Steel

C:  0.08-0.13%

P:  0.0-0.004%

S:  0.08-0.13%

Si:  –

Mn:  0.5-0.8%

Fe:  98.9-99.3%

 

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