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Действует
BS EN 10253-4. Butt-welding pipe fittings. Part 4. Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements — 158 стр.
ICS
23.040.40 Metal fittings / Металлические фитинги
77.140.20 Stainless. Including alloyed steels, corrosion-resistant steels, heat-resisting steels, etc. / Высококачественные стали