277 3. Aluminum Alloy Materials JIS Acronyms for Non-Ferrous Metal Quality Codes for Aluminum and Aluminum Alloys Type Material Code Applications Comment JIS Flat Bar Square Bar Hexagonal Bar Round Bar Section Steel Al−Cu Alloy A2011 General-Use Strength Materials Free-Cutting Alloy. It excels in machinability but has worse corrosion resistance. JIS H 4000 Good Al−Cu Alloy A2017 General-Use Strength Materials High Strength and Machinability Duralumin Good Good Good Al−M Alloy A5052 General Machine Parts Covers, cases, etc. Most typical aluminum alloy with medium strength. With high fatigue strength in comparison with its strength and high corrosion resistance to seawater. Good Good Al−M Alloy A5056 General Machine Parts It has fine machined surface and high corrosion resistance to seawater. It has fine machined surface and high corrosion resistance to seawater. Good Al−M −Si Alloy A6061 General Machine Parts Heat-treated corrosion resisting alloy. High durability owing to T6 treatment. Good Good Al−M −Si Alloy A6063 General Machine Parts and Structural Material Weaker than 6061, but more extrudable. Applicable to complex cross-sections shapes. Good corrosion resistance and surface treatment. Good Good Good Al−Zn−M Alloy A7075 Jigs and Dies It is one of the strongest aluminum alloys but has worse corrosion resistance. Extra Super Duralumin Good P Plate, Strip, Disk PC Laminate BE Extruded Bar BD Drawn Bar W Drawn Wire TE Seamless Extruded Tube TD Seamless Drawn Tube Code Definition Description F Plain Manufactured Material Completed as a product, without any order for thermal refining. Extruded or forged material, not thermally refined. H112 Wrought material, for which certain mechanical properties are guaranteed without the need of hardening. O Brought into the softest state by annealing. Completely re-crystallized by annealing. A thermally treated alloy should be cooled at a temperature below the annealing temperature to prevent the effect of annealing completely. H H1n Hardened by cold working. n is a numeral from 1 to 9, representing the degree of hardening. "8" represents hard material, and "4" represents the state halfway 1/2 between 0 and hard material. "2" represents the level halfway between 0 and 1/2 hardness, and "6" the state halfway between 1/2 hardness and hard material. H2n Hardened and then properly softened by heat. H3n Stabilized after cold working. T T1 Cooled after high-temperature working and then allowed to age naturally. Quenched at the end of a cold working process and allowed to age and harden at ambient temperature. Extruded material is typical material processed in this way. Cold working such as correction may be conducted unless it affects the strength. Used for an alloy such as 6063, for which the effect of quenching can be realized by cooling after hot working (extrusion). T3 Allowed to age naturally after solution treatment and cold working. Cold working is conducted for plates, rods, tubes, etc. to enhance the strength in some cases, and to improve the corrective dimension precision in other cases, with an obvious effect. T361 when cold working is performed to a higher degree than that for T3. T351 Allowed to age naturally after solution treatment and cold working. Cold working is conducted to enhance the strength after solution treatment, and then it is tension processed to give 1.5% to 3% permanent distortion to remove residual tension, and allowed to age naturally. T4 Natural aging after solution treatment Aging is usually completed after exposure to ambient temperature for approx. 4 days. In the case of 7NO1, however, aging is a longer process. The tensile property upon the elapse of one month is adopted as referential data. The variety that is given T4 treatment by a user under specified conditions is called T42. T5 Hardened through artificial aging after high-temperature processing and quenching Hardened through artificial aging to improve the mechanical properties and stabilize the dimensions. Used for an alloy or casting such as 6063, for which the effect of quenching can be realized by cooling after hot working (extrusion). T6 Hardened through artificial aging after solution treatment. Excellent strength can be attained for a thermally treated alloy without cold working in the typical heat treatment process. An item that is given T6 treatment by a user under specified conditions is called T62. T61 Wrought Materials: Hardened through artificial aging after solution treatment by quenching with lukewarm water. Casting:Tempered after hardening Quenched with lukewarm water to prevent distortion due to the main hardening. The conditions for hardening through artificial aging are adjusted to attain strength exceeding that accomplished by regular T6 treatment. T7 Stabilized after solution treatment Overaging surpassing those needed for hardening through artificial aging is carried out to attain the maximum strength, because special properties are adjusted somewhat at the expense of strength. T73 Overaging after solution treatment. Overaging after solution treatment to rectify the tendency to crack due to corrosion under stress. Specified in 7075, forgings, of JIS. T7352 Overaging after removal of residual stress after solution treatment. Overaging after removal of residual stress by compression to retain 1% to 5% permanent deformation subsequent to solution treatment, in order to rectify the tendency to crack due to corrosion under stress. Included in free-forged part, 7075. T8 Hardened through artificial aging after cold working subsequent to solution treatment. Cold working performed, with a noticeable effect, to improve the mechanical properties or to rectify drawbacks or improve dimension precision. Called T83 when the sectional area is reduced 3%through cold working. Called T86 when the reduction rate is 6%. These procedures are performed to enhance the strength. T9 Cold working after hardening through artificial aging subsequent to solution treatment. Cold working is necessary to enhance the strength. TW Welded Tube TWA Arc-Welded Tube S Extruded Section BR Riveted Bar FD Die-Forged Part FH Free-Forged Part Materials Varieties and Applications
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