4340 Low Alloy Steel

4340 is a low alloy steel with ultra high strength melted as AOD + VAR or VIM + VAR product.  It also possessed good toughness and fatigue strength when heat treated.  This alloy also displays excellent transverse properties even in larger cross sections.   These properties along with the cleanliness of VAR remelting make this alloy an excellent candidate for aerospace applications.

Please inquire today about your steel needs.

Specs USAP Produces to:
  • AMS 6414
  • AMS 6409
  • AMS 6415
  • AMS 6484
  • AMS-S-5000
  • Barden SA 3880
  • Bell 299-947-055
  • Bell 299-947-335
  • Boeing BMS 7-28
  • McDonnel Douglas DMS-1555
  • MIL-S-8844D
  • Sikorsky Aircraft SS9702 (capability)
  • NHBB PES 1.114
  • 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.


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

Industry / Trade Names
  • UNS G43406
  • AISI E4340
  • Din 1.6562
  • JIS 40NiCrMo7
  • Aerospace
Melt Types
Grade Families
  • Low Alloy Steels

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