Grade 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 6409
  • AMS 6414
  • AMS 6415
  • AMS 6484
  • AMS STD 2154
  • 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
  • SKF MS-231

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.

Approvals
  • Bell 299-947-055
  • Bell 299-947-335
  • Boeing BMS 7-28
  • Bombardier Approval AMS 6414
  • GE S35 (replaced S-400)
  • GE S-Spec-1 (replaced S-1000)
  • Lockheed Martin AMS 6414
  • Lockheed Martin AMS 6415
  • McDonnel Douglas DMS-1555
  • New Hampshire Ball Bearing NHBB PES 1.114
  • Pratt Whitney LCS
  • Safran - Messier Dowty AMS 6409
  • Safran - Messier Dowty AMS 6414
  • Schaeffler S130287
  • SKF MS-231

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
Markets
  • Aerospace
Melt Types
  • AOD+VAR
  • VIM+VAR
Grade Families
  • Low Alloy Steels

DISCLAIMER: The information provided on this Web site, technical or otherwise, is merely for informational purposes, and is not intended to serve as a guide, manual, instructions, or any kind reference for proper safety procedures or material purchasing. Universal Stainless makes no warranty, express or implied, based on the statements on this Web site and, as such, will not be liable for any damages, either direct or indirect, including but not limited to consequential damages, such as damages for loss of profits, that may arise based on reliance on the information provided on this Web site. Some information has been referenced from reliable industry sources.