Materials and Construction
Presence of silicon in steel

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

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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
Especially resistant to solutions containing H₂SO₄
All of these
Usually joined by burning (e.g. by melting to adjacent pieces with a torch)

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