6662
High-Strength6662
Si-modified 4340, ultra-high strength grade. (AMS; equiv AMS 6419 / GB 40CrNi2Si2MoVA). Nominal values—confirm mill certificate.
Chemical Composition (%)
| C | 0.4 |
|---|---|
| SI | 1.45 |
| MN | 0.6 |
| NI | 1.6 |
| CR | 0.7 |
| MO | 0.3 |
| V | 0.05 |
Mechanical Properties
Tensile:≥1930 MPa;Yield:≥1585 MPa;Elong:≥9%
Chinese Standard
AMS 6662
Equivalent Standards
AMS 6419
Equivalent Grades
GB 40CrNi2Si2MoVA
Applications
硅改性4340，超高强度。,"Bar
Available Forms
Forging"
Uses
Ultra-high-strength steel for safety- and weight-critical structural parts. Used in aerospace frames, armor, fasteners, landing gear and high-performance automotive components.
Heat Treatment
Quenched and tempered, or precipitation/ausforming treated to ultra-high strength; for maraging grades, solution at 815–900 °C then age 480–500 °C.
Precautions
High sensitivity to stress corrosion and hydrogen embrittlement — control plating/baking and avoid notches. Proof-load and inspect critically stressed parts.
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