8620 - ASTM A 646/A646M-2024

Grade	8620
ASTM Specification or Grade	Grade 4
Corresponding Standard	ASTM A646/A646M-2024 Standard Specification for Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings
Classification	Alloy Steel

8620 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Mo
Minimum Value	0.18	0.2	0.7	-	-	0.4	0.4	0.15
Maximum Value	0.23	0.35	0.9	0.015	0.012	0.6	0.7	0.25

* 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 %

8620 Mechanical Properties

Heat Treatment or Condition	Hardness HBW
Annealing	≤229

Approximate Comparison Table Processing Titanium and Titanium Alloys

China	Japan	United States		International Organization for Standardization	France	European Standard	Russia
GB	JIS	ASTM	UNS	ISO	NF EN/NF	EN	GOST
TA4	Class 4	Grade 4	R50700	Grade 4(Ti≥99.09)	T-A4	T1-P04	ВТ1-1(Ti98.95)

8620 Corresponding Standards(Same grade name, different standards)

1	ASTM A29/A29M-2012
	8620 G86200
2	ASTM A1040-2010
	8620
3	SAE J404-2000
	8620 G86200
4	ASTM A29/A29M-2020
	8620 G86200
5	ASTM A519/A519M-2024
	8620
6	ASTM A646/A646M-2024
	8620 Grade 4
7	ASME SA-29/SA-29M-2023
	8620 G86200
8	ASTM A513/A513M-2025
	8620
9	ASME SA-513-2023
	8620

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!