Grade 300 M
ASTM
Specification or Grade
Grade 8
Corresponding Standard ASTM A 646/A646M-2024
Standard Specification for Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings
Classification Alloy Steel
300 M Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Mo V
Minimum Value 0.38 1.45 0.65 - - 0.7 1.65 0.35 0.05
Maximum Value 0.43 1.8 0.9 0.012 0.012 0.95 2 0.45 0.1
* If any of the following elements are not specified, the following maximum limits shall apply: Nickel 0.35 %; Chromium 0.20 %; Molybdenum 0.06 %; Copper 0.35 %
300 M Mechanical Properties
Heat Treatment or Condition
Hardness
HBW
Annealing ≤285

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