AMS6281K Steel, Mechanical Tubing 0.50Cr - 0.55Ni - 0.20Mo (0.25 - 0.33C) (SAE 8630)

AMS6281K results from a Five-Year Review and update of this specification that revises composition analytical methods (3.1), adds grain refiners (3.1.1 and 3.3.2), revises macrostructure of large sections (Table 2 and 3.3.1.1), grain size determination (3.3.2), decarburization (3.3.4.4), and quality (3.4.2), prohibits unauthorized exceptions (3.6), and revises classification of tests (4.2), reporting (4.4), and identification (5.2).