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Standard

Steel Bars and Forgings, 0.25mo (0.35-0.40c) (SAE 4037)

2000-09-01
HISTORICAL
AMS6300D
This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, and forging stock. These products have been used typically for parts, 0.375 inch (9.52 mm) and under in nominal section-thickness at time of heat treatment, requiring a through hardening steel capable of developing hardness up to 40 HRC when properly hardened and tempered and also parts of greater thickness but requiring proportionately lower hardness, but usage is not limited to such applications.
Standard

Steel Bars, Forgings and Tubing, 0.50Cr - 1.8Ni - 0.25Mo (0.17 - 0.23C) (SAE 4320H)

2018-09-20
WIP
AMS6299G
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 to be carburized requiring high minimum core hardness with wide range in sections 0.375 inch (9.5 mm) and under in thickness, but usage is not limited to such applications. The core may or may not be machinable after hardening.
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