GB/T 25745-2010 PDF EnglishUS$220.00 · In stock · Download in 9 seconds
GB/T 25745-2010: Heat treatment of cast aluminium alloys Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 25745-2010: Heat treatment of cast aluminium alloys---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT25745-2010NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 25.200 J 36 Heat treatment of cast aluminium alloys Issued on. DECEMBER 23, 2010 Implemented on. JUNE 01, 2011 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Terms and definitions... 5 4 Classification... 5 5 Heat treatment equipment... 6 6 Heat treatment process... 8 7 Quality control and inspection... 13 8 Safety, health and environmental protection requirements... 15 Appendix A (Informative) Mechanical properties of cast aluminium alloys after heat treatment... 16ForewordAppendix A of this Standard is an informative appendix. This Standard shall be under the jurisdiction of National Technical Committee 75 on Heat Treatment of Standardization Administration of China (SAC/TC 75). The drafting organizations of this Standard. Jiangsu Fengdong Thermal Technology Co., Ltd. Organizations that participate in the drafting of this Standard. Beijing Institute of Aerial Materials, Yancheng Fengdong Special Furnace Co., Ltd., Guangdong Strong Metal Technology Co., Ltd. The drafters of this Standard. Xiang Jianhua, Wang Guangsheng, Dong Xiaohong, Wang Yong, Wang Songming, Shi Jianfeng, Han Zhichun, Su Yuhui, Gu Linlin. Heat treatment of cast aluminium alloys1 ScopeThis Standard specifies the heat treatment condition, heat treatment equipment, heat treatment process, quality control and inspection, safety, health and environmental protection requirements of cast aluminium alloys. This Standard applies to the heat treatment of cast aluminium alloy workpieces.2 Normative referencesThe terms in the following documents become the terms of this Standard by reference to this Standard. For dated references, all subsequent amendments (not including errata content) or revisions do not apply to this Standard. However, parties to agreements that are based on this Standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest edition applies to this Standard. GB/T 228, Metallic materials - Tensile testing at ambient temperature GB/T 231.1, Metallic materials - Brinell hardness test - Part 1.Test method GB/T 1173, Casting Aluminium Alloy GB 5959.1, Safety in installations for electroheating and electromagnetic processing - Part 1.General requirements GB 5959.4, Safety in electroheat installations - Part 4.Particular requirements for safety resistance heating installations GB/T 7232, Terminology of metal heat treatment3 Terms and definitionsTerms and definitions determined by GB/T 7232, GB/T 13324, and the following ones are applicable to this Standard.4 Classification4.1 The cast aluminium alloys heat-treated code shall be in accordance with the provisions of GB/T 1173 Casting Aluminium Alloy; the characteristics are shown in Table 1. 4.2 The heat treatment condition of castings shall be indicated in the drawings.5 Heat treatment equipment5.1 Heating equipment 5.1.1 Generally, an air circulation resistance heating furnace with a fan shall be used for the heat treatment of cast aluminium alloys, or a fuel furnace can be used to heat by the gas generated by combustion or a gas radiant tube. Direct heating of the flame is prohibited; measures such as setting a heat shield are used to prevent direct heating of the workpiece. 5.1.5 The temperature measurement system used on site shall be regularly subjected to system check under normal use. During the check, the distance between the detection thermocouple and the hot end of the recording instrument thermocouple shall be close. The check shall be performed with the furnace in a thermal stability. 5.2 Temperature control equipment 5.2.1 The accuracy of the on-site testing equipment shall be higher than that of the tested equipment. 5.2.4 Mercurial thermometer for measuring room temperature, with a resolution of 0.1°C and a verification cycle of 1 year. 5.2.5 The thermocouple shall comply with the provisions of GB/T 16839.2.See Table 5 for the technical requirements for the thermocouple commonly used on site. 5.3 Solid solution cooling tank 5.3.1 The solid solution cooling tank shall be located as close to the heating furnace as possible, so as to ensure that the heated castings are quickly immersed in the solid solution cooling tank; the solid solution cooling transfer time shall meet the requirements in Table 5.6 Heat treatment process6.1 Preparation before heat treatment 6.1.1 Check the conditions of the heating furnace, temperature control equipment, solid solution cooling tank, etc. before use, to ensure that the equipment is in good condition. 6.2 Furnace loading 6.2.1 Load according to the classification of the alloy designations, the geometric dimensions of castings and the heat treatment system. 6.2.2 Castings shall be installed in the effective working area of the heating furnace. 6.3 Heat treatment system 6.3.1 The temperature for solid solution treatment of aluminium alloy castings shall meet the requirements in Table 5. 6.3.3 When castings of different thicknesses are installed in the same heat treatment furnace, the heating and holding time shall be determined according to the maximum thickness. The holding time is calculated from the time when the lowest temperature recording thermocouple in the working area of the heating equipment reaches the lower limit of the specified temperature. 6.3.7 The time of the casting in the solid solution cooling medium shall be determined based on the maximum thickness of the casting, but shall not be less than 2 min. 6.3.8 Castings with higher requirements on dimensional accuracy and dimensional stability can be subjected to cold-heat circulating treatment (T9) as specified in Table 6.The specific process is as follows. 6.4 Repeated heat treatment 6.4.1 When the mechanical property of the casting after heat treatment is unqualified, a repeated heat treatment can be performed; the holding time of the repeated heat treatment can be reduced according to the circumstances; the times of repetition of solution treatment shall not exceed two times in general; the times of repetition of the aging treatment is not limited.7 Quality control and inspection7.1 Quality control 7.1.1 Personnel requirements Heat treatment operators, instrument staff, and inspectors shall be trained according to regulations, and they can take up their posts after passing the examination and obtaining the qualification certificate. 7.1.2 Heat treatment process control 7.1.3 Record 7.2 Inspection 7.2.1 Appearance inspection Castings after heat treatment shall be free of cracks, surface blistering, oxidation blackening and deformation. The appearance inspection shall be carried out visually (or with a magnifying glass below 10 times). 7.2.4 Metallographic examination The metallographic structure after heat treatment is not allowed to have over-burned structure.8 Safety, health and environmental protection requirements8.1 Equipment, production process, safety and hygiene, etc. shall comply with relevant regulations such as GB 15735, GB 5959.1, GB 5959.4, and GB 12348. 8.2 All relevant actions during the operation of the entire production line shall be set up with electrical safety interlocking devices and interlocking with related procedures, ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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