300M Low Alloy Steel

300M is a high strength low alloy steel that is melted as AOD + VAR. This alloy is comparable to 4340 with increased alloying elements such as vanadium and silicon giving it slightly higher strength and toughness.  This alloy is used in a wide array of aerospace applications including landing gear for many commercial airplanes.

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Specs USAP Produces to:
  • AMS 6257
  • AMS 6417
  • AMS 6419
  • Bendix CE-0896
  • Boeing BMS 7-26
  • Boeing DMS-1935
  • Curtiss-Wright CPS 4911
  • Grumman GM-1012
  • Liebherr LAT1-9042 
  • Lockheed C-05-1190
  • Lockheed STM 05-501
  • MIL-S-83135
  • MIL-S-8844
  • AMS STD 2154

Don't see the spec you're looking for? Not all specs are listed so please submit an inquiry!

Product Forms Sold:

Size ranges vary by specification and specific order requirements; inquire for your specific needs.


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Industry / Trade Names
  • UNS K44220
  • 4340mod
  • Aerospace
Melt Types
Grade Families
  • Low Alloy Steels

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