3A21 LF21 - GJB 2053A-2008

Grade	3A21
Old Grade
Corresponding Standard	GJB 2053A-2008 Specification for aluminium alloys structural sheet for aerospace
Classification	Aluminum and Aluminum Alloys

3A21 Chemical Element Composition Content (%)

Component	Fe	Si	Mn	Cu	Ti	Zn ^①	Mg	Other Individual	Other Total	More
Minimum Value	-	-	1	-	-	-	-	-	-	Al余量
Maximum Value	0.7	0.6	1.6	0.2	0.15	0.1	0.05	0.05	0.1	Al余量

"Other individual elements or other totals": The chemical composition includes elements not specified in the table. Analysis should only be conducted if these elements are suspected to be present, or if routine analysis suggests that their content may exceed the prescribed limits.

3A21 Mechanical Properties

thickness t mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %
0.3~3; no aluminum coating	O	100~150	-	≥22
>3~6; Not Including Aluminum	O	100~150	-	≥20
0.3~6; without Aluminum	H14、H24	145~215	-	≥6
0.3~0.5; No Aluminum Coating	H18	≥185	-	≥1
>0.5~0.8; No Aluminum Coating	H18	≥185	-	≥2
>0.8~1.3; No Aluminum Coating	H18	≥185	-	≥3
>1.3~6; No Aluminum Coating	H18	≥185	-	≥4

3A21 Corresponding Standards(Same grade name, different standards)

1	GB /T 3190-2008
	3A21 (LF21)
2	GB /T 3195-2016
	3A21 (LF21)
3	GB /T 3190-2020
	3A21 (LF21)
4	GB /T 3191-2019
	3A21
5	GJB 2053A-2008
	3A21 (LF21)
6	GJB 2379-1995
	3A21 LF21 二十一号工防锈铝
7	GB /T 3880.1-2012
	3A21 (LF21)

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