HP 9-4-20 - ASTM A 646/A646M-2024

Grade	HP 9-4-20
ASTM Specification or Grade	Grade 16
Corresponding Standard	ASTM A646/A646M-2024 Standard Specification for Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings
Classification	Alloy Steel

HP 9-4-20 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Mo	V	Co
Minimum Value	0.17	-	0.2	-	-	0.65	8.5	0.9	0.06	4.25
Maximum Value	0.23	0.1	0.4	0.01	0.01	0.85	9.5	1.1	0.12	4.75

* 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 %

HP 9-4-20 Mechanical Properties

Heat Treatment or Condition	Hardness HBW
Annealing	≤341

Approximate Comparison Table Processing Titanium and Titanium Alloys

China	Japan	United States	International Organization for Standardization	Germany	France	United Kingdom
GB	JIS	ASTM	ISO	DIN EN/DIN	NF EN/NF	BS EN/BS
TA8	Class 18	Grade 16	Ti-0.05Pd(b)	Ti2Pd	T-Pd(b)	Ti-0.05Pd(b)

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