Materials and Construction
Presence of silicon in steel

Decreases the blow holes formation tendency in castings
Is in the form of free Si
None of these
Indicates that steel is not deoxidised properly

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Materials and Construction
Lead pipe is

Having very low elastic limit resulting in permanent deformation from either mechanical or thermal strain
Usually joined by burning (e.g. by melting to adjacent pieces with a torch)
Especially resistant to solutions containing H₂SO₄
All of these

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