8640 H

Alloy Steel

AISI 8640 (H-series)

H-series 8640 optimized for hollow-section and tubular applications.

Chemical Composition (%)

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

Mechanical Properties

Yield:530MPa; Tensile:690MPa; Elong:14%; 200HB

Chinese Standard

AISI/SAE

Applications

Tubular products, hollow shafts

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