Carbon Steel

Cladding & Structural

Density: 7.82 g/cm³

Plain carbon steel used for reactor pressure vessel construction (with SS cladding), structural supports, and containment liner.

Composition

Nuclide / Element	Fraction
Iron	0.990000
Carbon	0.005000
Manganese	0.005000

Code output

MCNP

c Carbon Steel (mild)
c Density: 7.82 g/cm3 (use -7.82 on cell card)
c Weight fractions
m15   26000.80c -0.9900  $ Fe (balance)
       6000.80c -0.0050  $ C
      25055.80c -0.0050  $ Mn

Notes

Simplified composition for ASTM A516 Grade 70. RPV steels (e.g., SA-508) have more complex compositions with Ni, Mo, and Cr additions.

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