AISI 4120 Steel — Specifications & Listings

AISI

AISI 4120 is a chromium-molybdenum alloy steel offering good strength and wear resistance. It is commonly carburized or heat treated for improved surface hardness.

Category: Alloy Steel

Grade Details

Grade	AISI 4120
Standard	AISI
Description	AISI 4120 is a chromium-molybdenum alloy steel offering good strength and wear resistance. It is commonly carburized or heat treated for improved surface hardness.
Applications	Used for gears, crankshafts, studs, pins, machinery parts, and transmission components.

Chemical Composition (%)

C	Mn	Si	Cr	Mo	P	S
0.18-0.23	0.70-0.90	0.15-0.35	0.45-0.65	0.15-0.25	0.035 max	0.040 max

Mechanical Properties

tensile_strength	700-900 MPa
yield_strength	500-700 MPa
elongation	14-20%
hardness	180-240 HB

Active AISI 4120 Listings on M-EX

No active AISI 4120 listings at this time.