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GB/T 16923-2008: Normalizing and annealing of steel parts Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 16923: Historical versions
Similar standardsGB/T 16923-2008: Normalizing and annealing of steel parts---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/GBT16923-2008J 36 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA Replacing GB/T 16923-1997 Normalizing and Annealing of Steel Parts Issued on: JUNE 25, 2008 Implemented on: JANUARY 1, 2009 Jointly issued by. General Administration for Quality Supervision and Inspection and Quarantine (GAQSIQ); Standardization Administration (SAC) of the People’s Republic of China. GB 3. No action is required - Full-copy of this standard will be automatically & immediately delivered to your EMAIL address in 0~60 minutes. Table of Contents1 Scope ... 1 2 Normative References ... 1 3 Terms and Definitions ... 2 4 Classification, Code and Application Scope of Normalizing and Annealing Processes ... 2 5 To-be-treated Parts ... 3 6 Equipments for Normalizing and Annealing ... 4 7 Normalizing and Annealing Technology ... 6 8 Quality Inspection of Parts after Normalizing and Annealing ... 7 9 Safety and Health Requirements ... 8 10 Energy Consumption Requirements ... 8 11 Product Report List ... 8 Appendix A (Informative) Selection of Steel Parts Normalizing and Annealing Process Specification ... 9 Foreword This standard adopts JIS B 6911. 1999 "Normalizing and Annealing of Steel Parts" by revision. Compared with the JIS B 6911. 1999, this standard has the following deffirences. ――Part of the definitions adopt GB/T 7232-1999 "Terminology of Metal Heat Treatment" and GB/T 13324-2006 "Terminology of Heat Treatment Equipment"; ――Classification and code number of normalizing and annealing process complies with GB/T 12603 "Classifications and designations for metal heat treatment" (see Table 1); ――Not list the specific designtion for materials of to-be-treated parts (see 5.1); ――Add acceptance inspection for to-be-treated parts (see 5.4); ――Give temperature deviation range of effective heating area of heating furnace in accordance with the normalizing and annealing process requirements (se Table 4); ――Add the requirements of argon, nitrogen and hydrogen used in protective atmosphere heating furnace (see 6.1.3); ――Add "instrument and measuring tool for quality inspection" (see 8.2); ――Add "the requirements in safety and health" (see Chpter 9); ――Add "the requirements in energy consumption" (see Chapter 10); ――Add Informative appendix "Selection of codes for normalizing and annealing process of steel parts" (see Appendix A). This standard replaces GB/T 16923-1997 "Normalizing and Annealing of Steel Parts". Compared with GB/T 16923-1997, there are the following revisions and supplements. ――adjust the adustion on some technical contents (see Terms and Definiens, Table 1, Table 4, Table 5, Table 7, Table 11 and Appendix A); ――adjust some technical contents by conference to JIS B 6911. 1999 (Table 2, Table 3 and Table 5). Appendix A in this standard is informative. This standard is proposed by the Standardization Administration of China (SAC). This standard is under the jurisdiction of the National Technical Committee 367 on Machine Tool Numerical Control System of Standardization Administration of China. Drafting organizations. Beijing Research Institute of Mechanical & Electrical Technology (BRIMET), Heat Treating Branch of Chinese Mechanical Engineering Society Chief drafting staffs. Gao Ning, Xu Yueming, Shao Zhouming All previously repalced editionsyclept hereof are as. ――GB/T 16923-1997. Normalizing and Annealing of Steel Parts1 ScopeThis standard specifies technical requirement and method of normalizing and annealing for steel parts heated in furnace. This standard is not applicable to surface heating process method.2 Normative ReferencesProvisions of the following documents, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties whose enter into agreement according to these specifications are encouraged to research whether the latest editions of these labels are applied or not. For undated references, the latest editions of the normative documents are applicable to this standard. GB/T 224 Determination of depth of decarburization of steels GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1. Test method (scales A, B, C, D, E, F, G, H, K, N, T) (GB/T 230.1―2004, ISO 6508-1.1999, MOD) GB/T 231.1 Metallic materials - Brinell hardness test - Part 1. Test method (GB/T 231.1―2002, eqv ISO 6506-1.1999) GB/T 1182 Geometrical Product Specifications(GPS) - Geometrical tolerancing - Tolerances of form orientation location and run-out ( GB/T 1182-2008, ISO 1101.2004, IDT) GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1. Test method (GB/T 4340.1-1999, eqv ISO 6507-1. 1997) GB/T 4341 Metallic materials - Shore hardness test GB/T 6394 Metal - methods for estimating the average grain size GB/T 7232 Terminology of metal heat treatment GB/T 9452 Testing method for work zone of heat treatment furnace GB/T 12603 Classifications and designations for metal heat treatment GB/T 13298 Metal - Inspection method of microstructure GB/T 13324 Terminology of heat treatment equipment GB 15735 Requirements for the safety and health in production process of metal heat treatment GB/T 17358 Power consumption measurement and testing in heat treating production GB/T 19944 Fuel consumption quota and its counting and testing method for heat trating production JB/T 6050 Generalization of hardness test for heat treated iron and steel parts JB/T 7530 No. Process classification Code Application scope processing performance and relieve inner stress 6 Isothermal annealing 511-I Used for large-scale casting, forging parts and pressing part of intermediate carbon alloy-steel and some high alloy steel; Its objective is same to full annealing, but it can achieve more uniform structure and hardness 7 Spheroidizing 511-Sp Used for forging and rolled parts of true steel and hypereutectoid steel as well as structural steel cold-extruding parts; the objectives are to reduce hardness, improve structure, plastic behaviour and mechanical processing and heat treatment technological properties 8 Stress relieving annealing 511-St Relieving cold and heat-working unrelieved stress in medium steel and intermediate carbon alloy-steel 9 Flake-avoiding annealing 511-Hya Reducing hydrogen content in medium steel, intermediate carbon alloy-steel and high-carbon alloy steel and avoiding flake 10 Homogenizing annealing 511-H Reducing chemical component and structure segregation of intermediate carbon alloy-steel and high alloy steel casting, forging, and rolling parts, to realize homogenization 11 Recrystallization annealing 511-R Changing the distortion crystalline grain of carbon steel and low-alloy steel to uniform equiaxial grain, to relieve distortion strengthening and unrelieved stress 12 Bright annealing 511-Ba Non-oxidation annealing of carbon steel and low alloy steel surface 13 Stabilizing annealing 511-Saa Used for corrosion-resisting steel, to avoid reduction of intercrystalline corrosion resistance A such process codes as new codes are not listed in GB/T 12603.5 To-be-treated Parts5.1 Materials The designation and chemical composition of the materials shall meet the requirements of relevant standards as well as the quality requirements in Chapter 8. 5.2 Process state The process state of to-be-treated parts is detailed in Table 2. 5.3 Appearance, Quality, Shape, Size and Accuracy The appearance, quality, shape, size and accuracy of to-be-treated parts are detailed in Table 3. 5.4 Acceptance The two parties inspected to-be-treated parts according to compulsory inspection items specified in 5.1, 5.2 and 5.3; if necessary, the inspection may comply with relevant standards. The inspection acceptance records shall be recorded. 6.1.9 All parts of parts shall be cooled uniformly in the furnace cooling process. The cooling speed hereof can be adjusted for important parts. 6.2 Temperature measurement and temperature control devices 6.2.1 Heating zones of heating furnace shall be equipped with temperature measurement and auto-control recording devices as well as over-temperature warning device. 6.2.2 The synthetic error of display instrument for thermocouple temperature measuring device shall not exceed ± 4℃ when the temperature is under 400℃; it shall not exceed ± 1% the set temperature when the temperature is higher than 400℃. 6.3 Equipment maintenance The proper equipment re... ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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