40CrNi2Si2MoVA
High-Strength40CrNi2Si2MoVA
Specialty steel grade. ltra-high-strength. (GJB 5215; equiv GB 30CrMnSiNi2A / GJB 1694). Nominal values—confirm mill certificate.
Chemical Composition (%)
| C | 0.27 |
|---|---|
| CR | 0.9 |
| MN | 1 |
| SI | 0.9 |
| NI | 1.4 |
Mechanical Properties
Tensile:≥1570 MPa;Yield:≥1275 MPa;Elong:≥9%
Chinese Standard
GJB 5215 40CrNi2Si2MoVA
Equivalent Standards
GJB 1694
Equivalent Grades
GB 30CrMnSiNi2A
Applications
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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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