2A70 LD7 - GB /T 3191-2019

Grade	2A70
Old Grade
Corresponding Standard	GB /T 3191-2019 Extrusion rods and bars of aluminium and aluminium alloys
Classification	Aluminum and Aluminum Alloys

2A70 Chemical Element Composition Content (%)

Component	Fe	Si	Mn	Ni	Cu	Ti	Zn	Mg	Other Individual	Other Total	More
Minimum Value	0.9	-	-	0.9	1.9	0.02	-	1.4	-	-	Al:余量
Maximum Value	1.5	0.35	0.2	1.5	2.5	0.1	0.3	1.8	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.

2A70 Mechanical Properties

condition	Mark	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Elongation or Extension Rate δ %
Bar; d≤150	2A70T6、T1	T62、T6	≥355	≥8

① O = annealed ;
② H = work hardened;
③ T6 = solution heat treated + artificial aged;
④ T1 = high temperature molding + natural aged;
⑤ T3 = after solution heat treated, cold processing, and then natural aged to a basically stable;
⑥ T4 = after solution heat treated, natural aged to a basically stable;
⑦ T5 = cooled by high temperature molding, and then artificially aged to a basically stable;
⑧ T7 = after solution heat treated, overaged;
⑨ T8 = after solution heat treated, cold processing , and then artificial aged
◎ d = round rod diameter or thickness of square rod or hexagonal rod, t = square rod or hexagonal rod thickness, unit mm

2A70 Corresponding Standards(Same grade name, different standards)

1	GB /T 3190-2008
	2A70 (LD7)
2	GB /T 3190-2020
	2A70 (LD7)
3	GB /T 3191-2019
	2A70 (LD7)
4	GJB 3539-1999
	2A70 (LD7)

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