300MVAR

High-Strength

300MVAR

Specialty steel grade. ; equiv AMS 6419 / 300M VAR). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.4
SI1.45
MN0.6
NI1.6
CR0.7
MO0.3
V0.05

Mechanical Properties

Tensile:≥1930 MPa;Yield:≥1585 MPa;Elong:≥9%

Chinese Standard

AMS 6419 300MVAR

Equivalent Standards

AMS 6419

Applications

硅改性4340，超高强度。,Bar

Available Forms

Ultra-high-strength steel for safety- and weight-critical structural parts. Used in aerospace frames, armor, fasteners, landing gear and high-performance automotive components.

Uses

Quenched and tempered, or precipitation/ausforming treated to ultra-high strength; for maraging grades, solution at 815–900 °C then age 480–500 °C.

Heat Treatment

High sensitivity to stress corrosion and hydrogen embrittlement — control plating/baking and avoid notches. Proof-load and inspect critically stressed parts.

Precautions

300M VAR

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