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描述 : SAE AMS6491G - 2024 - Steel Bars, Forgings, Mechanical Tubing and Forging Stock 4.1Cr - 4.2Mo - 1.0V (0.80 - 0.85C) (M-50) Premium Aircraft-Quality for Bearing Applications, Double Vacuum Melted
https://www.sae.org/standards/content/ams6491g/