3A21 - GB /T 3191-2019

Grade	3A21
Corresponding Standard	GB /T 3191-2019 Extrusion rods and bars of aluminium and aluminium alloys
Classification	Aluminum and Aluminum Alloys

3A21 Mechanical Properties

condition	Mark	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Elongation or Extension Rate δ %
Bar; d≤150	3A21O	O	≤165	≥20
Bar; d≤150	3A21H112	H112	≥90	≥20

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

Approximate Comparison Table Wrought aluminum and aluminum alloy

China		Japan	United States		International Organization for Standardization		European Standard
GB	ISC	JIS	ASTM	UNS	ISO	Numerical Grade	EN
3A21 (LF21)	3203	3203 A93203	3203	A93203	AlMn(B)	A93203	EN-AW-AlMn(B)

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"!