In essence, industrial pure aluminum can be regarded as aluminum iron silicon alloy with very low content of iron and silicon. In addition to acicular hard brittle feal3 and massive hard brittle siliceous spots, two ternary phases can be formed in the impurity phase. When Fe > Si, two ternary phases are formed α( Fe2sial8) phase; When Si > Fe, it is formed β( Fesial5) phase. Both phases are brittle compounds, and the latter is more harmful to plasticity. Therefore, Fe > Si is generally made in industrial pure aluminum. When Fe > Si, the crystallization temperature range and the tendency of casting cracks can be reduced. When Fe / Si ≥ 2 ~ 3, industrial pure aluminum sheet with fine grain and good stamping properties can be produced. It should be noted that in industrial pure aluminum, iron and silicon mostly exist in the form of ternary compounds, and there are few opportunities for feal3 and free silicon.High quality galvanize steel square rectangular tubes from China supplier
Industrial pure aluminum has the general characteristics of aluminum, low density, good conductivity and thermal conductivity, good corrosion resistance and good plastic processing performance. It can be processed into plates, strips, foils and extruded products, and can be used for gas welding, argon arc welding and spot welding. Industrial pure aluminum cannot be strengthened by heat treatment, but its strength can be improved by cold deformation.
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The only form of heat treatment is annealing. The starting temperature of recrystallization is related to impurity content and deformation degree, which is generally about 200 ℃. Of annealed sheet σ b=80～100MPa， σ 0.2=30～50MPa， ζ= 35%～40%，HB=25～30。 After 60% ~ 80% cold deformation, it can be increased to 150 ~ 180MPa, but ζ The value decreased to 1% ~ 1.5%. Increasing the content of iron and silicon impurities can improve the strength, but reduce the plasticity, conductivity and corrosion resistance. The mechanical properties of different cold work hardening states can be obtained by adjusting the annealing temperature or controlling the cold deformation after annealing. In order to improve formability, the former method is better.duplex 2205 stainless steel pipe with high quality