Steel Bars, Forgings, and Tubing, 1.8ni 0.25mo (038-0.43c) (SAE 4640)

Standard:
Revised:
  • 2001-03-01
 
  • HISTORICAL Access the latest revision: AMS6312J
Publisher:
  • SAE International
Pages:
10
Scope:

This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.

These products have been used typically for parts 0.250 inch (6.35 mm) and under in nominal section thickness at time of heat treatment requiring a through-hardening steel capable of developing hardness as high as 50 HRC when properly hardened and tempered and also parts of greater thickness requiring proportionately lower hardness, but usage is not limited to such applications.

History:
Standard Published Revision Status
AMS6312J 2015-12-03 Latest Revised
2011-05-17 Historical Revised
2006-05-17 Historical Revised
2001-03-01 Historical Revised
1994-04-01 Historical Reaffirmed
1981-04-01 Historical Revised
1978-01-15 Historical Revised
1971-05-15 Historical Revised
1942-03-01 Historical Revised
1939-12-04 Historical Issued
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