2A02 aluminum alloy introductory material Name: 2A02 formerly known as: standard of LY2: YS / T 439-2001 Features and Scope: This is a higher strength of a hard aluminum alloy, which is characterized by: high strength at room temperature, but also high heat resistance, a heat-resistant hard aluminum. High plasticity, when the alloy during hot deformation in the extruded semi-finished products, the tendency to form a coarse-grained ring, heat strengthened, in the state of quenching and artificial aging. And 2A70, 2A80 heat-resistant wrought aluminum compared to corrosion stability is good, but there is stress corrosion cracking tendency; slightly better weldability than 2A70, good machinability 
 Chemical composition 
 Chemical Composition: Silicon Si: 0.30 Fe: 0.30 copper of Cu :2.6-3 .2 Mg Mg :2.0-2 .4 Zn of Zn: 0.10 Mn of Mn :0.45-0 .7 Ti Ti: 0.15 Al Al: margin Note: Single: 0.05; Total: 0.10 
 Mechanical properties 
 Mechanical properties: tensile strength σb (MPa): ≥ 430 conditions the yield strength σ0.2 (MPa): ≥ 275 the elongation δ5 (%): ≥ 10 Note: The bar at room temperature longitudinal mechanical properties of the specimen dimensions: bar diameter inscribed circle diameter (square bar, hexagon bar) ≤ 150 Heat Treatment Specification: 1) rapid thermal annealing: heating to 350 ~ 370 ℃; different with material thickness, holding time is 30 ~ 120min; air or water cooled. 2) quenching and aging: hardening 495 ~ 505 ° C, water-cooled; artificial aging 165 ~ 175 ° C, 10 ~ 16h, air-cooled. Status: aluminum and aluminum alloy extruded bars (≤ 150mm, H112.F.T6 state) 


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