[MW:5278] silicon content

Dear All,

I just want to join two pipes of ASTM A106 Grade B. As per project
speification CE(Carbon Equivalent) permitted as per IIW formula is
0.43 I found that there is no silicon participation in this
formula.But I have come to know that API RP 577 Clause 10.9.1 using a
formula which includes silicon and rest of the part is equivalent to
IIW formula.If we review the standard for ASTM A 106 Grade B for
chemical properties(Table 1 Chemical requirements);we can observe that
the chemical composition has no restriction for silicon (min 0.10 for
all grades) .ie, there is no maximum limit !!! Can we accept
technically an ASTM A 106 Grade B mill certificate with silicon
content ranging from 0.10 to UNLIMITED ??? If not what would be the
maximum acceptable silicon percentage in A106 Grades ?

Thanks and Regards

Limesh

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