E550 (ISO) Worldwide equivalent grades Steel Number. Worldwide equivalents of grade E550 (InterISO) Cross reference table. for Steel E550 (ISO) and its European equivalent S550QL (1.8926) ( EN ) European equivalent grade for Alloy special steel with specified minimum values of impact energy at temperatures not lower than 40 °C E550 (ISO)S550QL (1.8926) NEW opportunities for buyers![price]
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