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21CrMoV5-7

1.7709
alloy_steelhigh_temp
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Cr-Mo-V high-temperature alloy steel for bolting at elevated temperatures up to ~550°C. Higher Cr and Mo than 15CrMoV5-9 for improved creep resistance. Used for turbine casing bolts, main flange bolts in steam power plants, and high-pressure/high-temperature petrochemical fasteners.

International equivalents

FlagStandardCountryGradeNumberMatch
🇺🇸ASTMUSAASTM A193 B16 (approx)—REF
🇪🇺ENEurope21CrMoV5-71.7709100%

Sources: ASTM A193, EN 10269:2013

Chemical composition comparison (wt%)

Side-by-side: 21CrMoV5-7 (EN 10269) vs 21CrMoV5-7 (EN) (EN 10269:2013)

Element21CrMoV5-7 (EN 10269)21CrMoV5-7 (EN)Overlap
C—0.17–0.25%—
Si—0–0.35%—

Mechanical properties

Compatibility verdict

21CrMoV5-7 and 21CrMoV5-7: 100% composition match

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