Nit. 135 - ASTM A 646/A646M-2024

Grade	Nit. 135
ASTM Specification or Grade	Grade 21
Corresponding Standard	ASTM A646/A646M-2024 Standard Specification for Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings
Classification	Alloy Steel

Nit. 135 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Mo	Al
Minimum Value	0.38	0.2	0.5	-	-	1.4	0.3	0.95
Maximum Value	0.43	0.4	0.7	0.015	0.012	1.8	0.4	1.3

* 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 %

Nit. 135 Mechanical Properties

Heat Treatment or Condition	Hardness HBW
Annealing	≤285

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