AMS6290L Steel, Bars, Forgings, and Forging Stock, Carburizing 1.8Ni - 0.25Mo (0.11 - 0.17C) (SAE 4615)

AMS6290L is the result of a Five-Year Review and update of the specification. The revision updates the title to match the scope, clarifies chemistry reporting (3.1.2), updates macrostructure requirements (3.3.1.1, 8.9), revises hardenability and hardness requirements (3.3.3, 8.3), prohibits unauthorized exceptions (Table 2, 3.6, 8.5), addresses reduced testing per AMS2301 (4.2.1, 4.4.1, 4.4.3, and 4.4.5), and adds notes on machining (8.8).