8640 QT

Alloy Steel

AISI 8640 Quenched & Tempered

Quenched and tempered 8640 for high-strength applications.

Chemical Composition (%)

C0.38
CR0.4
MN0.7
MO0.15
NI0.4
SI0.15

Mechanical Properties

Yield:650MPa; Tensile:870MPa; Elong:18%; 58HRC

Chinese Standard

AISI/SAE

Applications

Shafts, gears, axles, bolts, connecting rods, crankshafts, forgings

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