【国外标准】 Standard Practice for Aluminum Alloy Extrusions Press Cooled from an Elevated Temperature Shaping Process for Production of T1, T2, T5 and T10-Type Tempers

This practice establishes the controls necessary for production of extrusions cooled from an elevated temperature shaping (extrusion) process for the production of T1, T2, T5 and T10–type tempers. The equipment shall be used for billet preheating, extruding and quenching. Quenching methods may consist of, but are not limited to, air, water or water/glycol mixture in forced air, water spray, fog or mist, standing wave, a quench tank or another pressurized water device, or a combination thereof. Surveillance tests should include tensile properties for all material and metallographic examination to confirm that the elevated temperature shaping process has not resulted in eutectic melting or subsurface porosity from hydrogen diffusion. Specimens shall be sectioned in the plane perpendicular to the direction of the extrusion, polished to an appropriate fineness, mildly etched with an etchant such as Keller’s reagent to reveal any evidence of eutectic melting. Specimens shall also be subjected to tension and hardness tests. During the extrusion process, the following temperature measuring points should be monitored and controlled as per the producer’s internal procedures. The measuring points include but are not limited to: billet or log temperature in the heating equipment, billet or log temperature after heating and before charging into the extrusion press, temperature of the extrudate at the press exit, temperature of the extrudate at quench entry, temperature of the extrudate at the completion of quench, and billet temperature shall not exceed the maximum temperature for the alloy. Artificial aging shall be accomplished using times and temperatures as necessary to achieve required properties.1.1 This practice establishes the controls necessary for production of extrusions cooled from an elevated temperature shaping (extrusion) process for the production of T1, T2, T5 and T10-type tempers (see ANSI H35.1/H35.1M).1.2 This practice is for production of extruded product supplied in the 6xxx and 7xxx alloys shown in Table 1 in the T1, T2, T5 or T10-type tempers (see ANSI H35.1/H35.1M). It contains pertinent information to be used in establishing production practices and is descriptive rather than prescriptive. For the attainment of T3, T4, T6, T7, T8 and T9-type tempers by extrusion press solution heat treatment, refer to Practice B807/B807M.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.