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3 XXX is alloy aluminum sheet, main alloy elements and the c
3 XXX is alloy aluminum with Mn as main alloy element of aluminum alloy, belong to the heat treatment strengthening alloy aluminum plate. Its high plasticity, good welding performance, strength is higher than 1 XXX is alloy aluminum plate, and the corrosion resistance and 1 XXX is alloy aluminum sheet, is a kind of medium strength of the alloy aluminum corrosion resistant performance is good, he is widely used, the dosage.
Alloying elements and impurity elements in the 3 XXX is the role of aluminum alloy
Mn, Mn is 3 XXX is alloy aluminum sheet, the only main alloy elements, its content is in commonly 1.0% ~ 1.6%, the strength of the alloy, plastic and process performance is good, Mn and Al MnAl6 phase can be generated. The strength of the alloy increase with the increase of Mn content, when Mn content higher than 1.6%, the alloy strength increase, but due to a large number of brittle compounds MnAl6 formation, the deformation of alloy, easy to crack. With the increase of Mn content, the recrystallization temperature of the alloy increase accordingly. Department alloy because of great ability too cold, so during rapid cooling crystallization, produce very big coring, Mn concentration in the center of the dendrite is low, and in the edge area is high, when the products have cold obvious Mn segregation, easy to form a thick grain size after annealing.
Fe: Fe (FeMn) formed in the soluble in MnAl6 Al6 compounds, so as to reduce the Mn solubility in the Al. Adding 0.4% ~ 0.7% of the alloy of Fe, but Fe + Mn to ensure that not more than 1.85%, the sheet can effectively refine the grain size after annealing, otherwise, to form the thick sheet (FeMn) Al6 compound, can reduce the mechanical properties of the alloy and process performance.
Si, Si is harmful impurities. Si and Mn form complex ternary phase T (Al12Mn3Si2), the phase can be dissolved Fe, form (AlFeMnSi) quaternary phase. Fe and Si in the alloy exist at the same time, the first form of alpha (Al12Mn3Si2) or beta (Al9 Fe 2 si2) phase, the damage the strong influence of Fe, Si in the alloy should be controlled below 0.6%. Si can also reduce the Mn solubility in the Al, and is bigger than the influence of Fe. Fe and Si can accelerate Mn during hot deformation from the decomposition of supersaturated solid liquid, can also reduce some mechanical properties.
Mg: a small amount of Mg (0.33%) material can significantly refine grain department alloy after annealing, and slightly increase its tensile strength, but also harm the surface gloss of annealed material. Mg can be Al - Mg alloy of the alloying elements, adding 0.3% ~ 1.3% of Mg, alloy strength increase, elongation (annealing state) is reduced, thus developed Al - Mg - Mn alloy.
Cu: Cu alloy containing 0.05% ~ 0.5%, can significantly improve the tensile strength. But contains a small amount of Cu (0.1%) can reduce the corrosion resistance alloy, therefore, the Cu content of alloy should be controlled below 0.2%.
Zinc, zinc content lower than 0.5%, the mechanical properties and corrosion resistant properties of the alloy has no obvious influence, to the welding performance of alloy, zinc content is controlled under 0.2%.