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SAE AMS6290 Revision J, October 1, 2013
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Steel, Bars and Forgings, Carburizing 1.8Ni - 0.25Mo (0.11 - 0.17C) (SAE 4615)
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AIA/NAS Aerospace Standards
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This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, and forging stock.

Application

These products have been used typically for carburized parts which require low minimum core hardness and allow a wide hardness range in sections 0.375 inch (9.50 mm) and under in nominal thickness, but usage is not limited to such applications. The core may or may not be machinable after hardening.