4330V
Alloy Steel4330V
Aerospace Cr-Ni-Mo-V Q&T ultra-high-strength steel. (GJB 5218; equiv AMS 6411 / 4330V). Nominal values—confirm mill certificate.
Chemical Composition (%)
| C | 0.28 |
|---|---|
| MN | 0.65 |
| SI | 0.15 |
| NI | 1.65 |
| CR | 0.7 |
| MO | 0.3 |
| V | 0.05 |
| P | 0.015 |
| S | 0.01 |
Mechanical Properties
Tensile:≥1520 MPa;Yield:≥1310 MPa;Elong:≥10%;RA:≥30%
Chinese Standard
GJB 5218 4330V
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 (≈0.825%) improves hardenability, wear and corrosion resistance. Molybdenum (≈0.375%) raises high-temperature strength and prevents temper embrittlement. Nickel (≈1.825%) 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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