| 摘要 |
<p>An extruded product, in particular a tube, made of alloy composed as follows (% by weight): Si<0.30, Fe:<0.30, Cu<0.05, Mn: 0.5−1.2, Mg 0.5−1.0, Zn<0.20, Cr: 0.10−0.30, Ti<0.05, Zr<0.05, Ni<0.05, others<0.05 each and<0.15 total, the remainder aluminum. The invention is further directed to a manufacturing process for tubes extruded from this composition including the steps of casting a billet, optionally homogenizing this billet, extruding a tube, drawing this tube in one or more passes, and continuously annealing at a temperature ranging between 350 and 500° C. with a rise in temperature of less than 10 seconds. The tubes according to the invention are advantageously used for air-conditioning systems for the passenger compartment of motor vehicles using CO2 as a refrigerating gas.</p> |
