2A12 chemical composition and heat treatment specifications

Chemical composition

● Chemical Composition:
Al Al: margin
    Silicon Si: ≤ 0.50
Copper Cu: 3.8 ~ 4.9
Magnesium Mg: 1.2 ~ 1.8
Zinc Zn: ≤ 0.30
Manganese Mn: 0.30 ~ 0.9
Titanium Ti: ≤ 0.15
Nickel Ni: ≤ 0.10
Iron Fe: 0.000 ~ 0.500
Fe + Ni Fe + Ni: 0.000 to 0.500
Note: Individual: ≤ 0.05; Total: ≤ 0.10

Mechanical Properties

2A12 aluminum alloy mechanical properties:
Tensile strength σb (MPa): ≥ 410
Conditions yield strength σ0.2 (MPa): ≥ 265
Elongation δ5 (%): ≥ 12
Note: The bar at room temperature longitudinal mechanical properties
Sample size: rod diameter (square bar, hexagon bar inscribed circle diameter) ≤ 22

Heat treatment specifications

2A12 aluminum heat treatment specifications:
1) homogenizing annealing: heating from 480 to 495 ° C; thermal insulation of 12 ~~ 14h; furnace cooling. 2) complete annealing: heating to 390 to 430 ° C;

Holding time 30 ~ 120min; furnace cooling to 300 ℃, air cooling. 3) rapid thermal annealing: heating 350 ~ 370 ℃; holding time of 30 ~

120min; air cooling. 4) quenching and aging: Quenching The 495 ~~ 505 ° C, water-cooled; artificial aging 185 to 195 ° C, 6 ~~ 12h, air-cooled;

Natural aging: room temperature for 96h.