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 T10type 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 Kellers 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 producers 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.
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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).
1.2 This practice is for production of extruded product supplied in the alloys shown in in the T1, T2, T5 or T10-type tempers. It contains pertinent information to be used in establishing production practices and is descriptive rather than prescriptive.
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 and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
B557 Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products
B647 Test Method for Indentation Hardness of Aluminum Alloys by Means of a Webster Hardness Gage
B881 Terminology Relating to Aluminum- and Magnesium-Alloy Products
B918 Practice for Heat Treatment of Wrought Aluminum Alloys
E10 Test Method for Brinell Hardness of Metallic Materials
E18 Test Methods for Rockwell Hardness of Metallic Materials
E648 Test Method for Critical Radiant Flux of Floor-Covering Systems Using a Radiant Heat Energy Source
E2281 Practice for Process and Measurement Capability Indices
aluminum alloys; cooled from an elevated temperature shaping process; press quenched;
ICS Number Code 77.120.10 (Aluminium and aluminium alloys)
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