4335V

Alloy Steel

4335V

Aerospace Cr-Ni-Mo-V Q&T ultra-high-strength steel. (GJB 5218; equiv AMS 6411 / 4330V). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.28
NI1.8
CR0.8
MO0.35
V0.05

Mechanical Properties

Tensile:≥1200 MPa;Yield:≥1050 MPa;Elong:≥14%

Chinese Standard

GJB 5218 4335V

Equivalent Standards

AMS 6411

Equivalent Grades

4330V

Applications

航空用Cr-Ni-Mo-V调质超高强钢。,"Bar

Available Forms

Forging"

Uses

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈0.95%) improves hardenability, wear and corrosion resistance. Molybdenum (≈0.45%) raises high-temperature strength and prevents temper embrittlement. Nickel (≈2%) increases toughness and impact strength at low temperature. Vanadium (≈0.085%) refines grain and strengthens the tempered structure. Applied to gears, shafts, bolts, connecting rods, pressure parts and heavy forgings in automotive, energy and machinery sectors.

Heat Treatment

Austenitize at 820–870 °C (oil or water quench depending on section) and temper at 400–650 °C to the required strength/toughness balance.

Precautions

Preheat and control interpass temperature when welding; post-weld heat treatment or stress relief is recommended to avoid hard-zone cracking. Use low-hydrogen electrodes. Protect from decarburization during heating (controlled atmosphere or protective coating).

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