AS B20-1931
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Charcoal wrought iron lapwelded tubes
30-06-2017
01-01-1931
Applies to charcoal wrought iron lapwelded tubes intended primarily for use in the construction of boilers, unfired pressure vessels and their appurtenances, and in types of pipe line construction for which such tubes are suitable.
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