4024

Alloy Steel

4024

(SAE J404). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.2
MO0.2
MN0.6
SI0.1
P0.04
S0.05

Mechanical Properties

Tensile:≥585 MPa;Yield:≥350 MPa;Elong:≥18%

Equivalent Grades

SAE J404 4024

Available Forms

Bar,Plate

Uses

Carburizing (case-hardening) steel with low carbon core for toughness and a hard, wear-resistant surface after carburizing. Used for gears, camshafts, pinions, spline shafts, bushings and transmission parts subjected to fatigue and surface wear.

Heat Treatment

Typically normalized (880–920 °C, air cool) or carburized (900–930 °C) for case-hardening grades, then quenched and tempered at 150–200 °C. Carburize 900–930 °C, direct/intake quench, temper 150–200 °C; useful case depth 0.5–1.5 mm.

Precautions

Weldable with standard procedures; preheat may be needed for thick sections or higher-carbon/ alloy grades. Protect from decarburization during heating (controlled atmosphere or protective coating). Machine the core stock before surface hardening; leave grinding allowance for the hardened case.

Request a Quote Back to category

Comments 0