300M is a vacuum melted low alloy steel with the inclusion of vanadium and a higher silicon composition. Considered to be a modified 4340 steel possessing high hardenability and strength with good ductility, toughness, fatigue strength and resilience. Where fracture toughness and impact strength are crucial, 300M is a great choice. 300M alloy is used primarily in the 270/300 ksi (1862/2068) tensile strength range for aircraft landing gears, flap tracks, airframe parts, missile components and other structural applications.


300M Alloy Steel Grade Chemistry
C Cr Mn Mo Ni P S Si V Fe
MIN 0.38 0.70 0.60 0.30 1.65 1.45 0.05 Balance
MAX 0.45 0.95 0.90 0.50 2.00 0.10 0.10 1.80 0.10 Balance



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