921A
High-Strength921A
Aerospace ultra-high-strength plate. (GJB 5216; equiv GB D6AC / 40CrMnSiMoV). Nominal values—confirm mill certificate.
Chemical Composition (%)
| C | 0.42 |
|---|---|
| CR | 0.9 |
| NI | 0.4 |
| MO | 0.9 |
| V | 0.05 |
Mechanical Properties
Tensile:≥1500 MPa;Yield:≥1260 MPa
Chinese Standard
GJB 5216 921A
Equivalent Standards
GB D6AC
Equivalent Grades
40CrMnSiMoV
Applications
航空超高强中厚板。,"Plate
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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