ASTM A193 Grade B7-spesifikaasje beslacht de easken foar hege krêft Alloy Steel-bolmateriaal foar hege temperatuer of oare spesjale doel applikaasjes. It is a standard specification that defines typical chemical composition, mechanical properties, hardness requirements, preferential heat treatment, product marking, certification, and other requirements for bolted connections used in pressure vessel service, valves, flanges, and fittings. ASTM A193 definieart si (metryske) en inch-pûn-ienheden.