International Organization for Standardization (ISO)
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ISO 6758:1980
Scope
Specifies the characteristics of plain end tubes manufactured from unalloyed and alloyed steels (including austenitic stainless steels). It does not apply to steel tubes intended for exposure to flame. An annex gives metric dimensions which correspond to inch dimensions.
ISO 6758:1980 history
1980ISO 6758:1980 Welded steel tubes for heat exchangers