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GB/T 20078-2023 English PDF

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GB/T 20078-2023: Copper and copper alloys - Forgings
Status: Valid

GB/T 20078: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 20078-2023English959 Add to Cart 7 days [Need to translate] Copper and copper alloys - Forgings Valid GB/T 20078-2023
GB/T 20078-2006English1479 Add to Cart 6 days [Need to translate] Copper and copper alloys -- Forgings Obsolete GB/T 20078-2006

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Basic data

Standard ID GB/T 20078-2023 (GB/T20078-2023)
Description (Translated English) Copper and copper alloys - Forgings
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard J32
Classification of International Standard 77.120.30
Word Count Estimation 47,411
Date of Issue 2023-05-23
Date of Implementation 2023-12-01
Older Standard (superseded by this standard) GB/T 20078-2006
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 20078-2023: Copper and copper alloys - Forgings

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 77:120:30 CCSJ32 National Standards of People's Republic of China Replacing GB/T 20078-2006 Copper and Copper Alloy Forgings Released on 2023-05-23 2023-12-01 implementation State Administration for Market Regulation Released by the National Standardization Management Committee

table of contents

Preface I 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 logo 1 5 Ordering information 8 6 Technical Requirements 8 7 Sample 21 8 Test method 22 9 Eligibility Documents 23 10 Marking, Labeling, Packaging 23 Appendix A (Informative) Tensile Properties 24 Appendix B (Informative) Recommended Design Guidelines 26 Reference 42

foreword

This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting: This document replaces GB/T 20078-2006 "Copper and Copper Alloy Forgings": Compared with GB/T 20078-2006, except for structural adjustment and Apart from editorial changes, the main technical changes are as follows: a) Added the scope of application of the document (see Chapter 1, Chapter 1 of the:2006 edition); b) Changed some terms and definitions (see Chapter 3, Chapter 3 of the:2006 edition); c) The content related to "material" and "material status" has been deleted (see 4:1 and 4:2 of the:2006 edition), and the content of "material grade" has been added (see 4:1); d) Deleted references to EN standards (see 4:1:3, 4:2, 8:3, 8:6, 9:1, 9:2, Table 1 of the:2006 edition); e) The "Material Group" column has been added, some material grades have been deleted, and material grades and As and P elements have been added (see Table 1 to Table 8, Table 1~Table 8 of the:2006 edition); f) Deleted "Table 9 Material Groups and Categories" (see Table 9 of the:2006 edition); g) Added Table 9 "Hardness of forgings in material group I" and Table 10 "Hardness of forgings in material group II" (see Table 9, Table 10); h) Changed the requirements for ordering documents (see Chapter 5, Chapter 5 of the:2006 edition); i) The requirements for mechanical properties, electrical properties, and dezincification resistance have been changed (see 6:2, 6:3, 6:4, 6:2, 6:3, 6:4 of the:2006 edition); j) Delete the requirement of residual stress (see 6:5 of the:2006 edition); k) Added requirements for heat treatment and stress corrosion resistance (see 6:5, 6:6); l) The requirements for volume resistivity and mass resistivity have been deleted, and the electrical performance requirements for Cu-HCP have been added (see Table 11,:2006 edition Table 13); m) Changed the general requirements in "Tolerances of Die Forgings", the dimensional tolerances in the die cavity and across the parting line (see 6:7,:2006 edition 6:6); n) Some values of die forging tolerances of material group Ⅰ, material group Ⅱ and material group Ⅲ have been changed (see Table 12~Table 14,:2006 edition Table 14~Table 16); o) Added Table 15 "Tolerances for Die Forgings of Material Group I (Polygonal Shape)" (see Table 15); p) The regulations on "Tolerances for Hollow Die Forgings" have been changed, and the illustration of hollow die forgings has been divided into the center line of the hole consistent with the forging direction and In the two cases perpendicular to the forging direction, the tolerance values of hollow die forgings have been changed (see 6:8, Figure 14, Figure 15, Table 17,:2006 Version 6:7, Figure 14, Table 18); q) The general requirements, dimensional tolerances, and flatness tolerances in "Free Forging Tolerances" have been changed (see 6:9, 6:8 of the:2006 edition); r) The requirements for special surfaces have been added to the surface quality (see 6:10, 6:9 of the:2006 edition); s) Changed the sampling requirements for hardness test, stress corrosion resistance test, dezincification resistance test and electrical performance test (see 7:3,:2006 edition 7:3); t) Change the provisions of the test methods for hardness test, dezincification resistance test and stress corrosion resistance test (see 8:3, 8:5, 8:6,:2006 edition 8:2, 8:5, 8:6 of the:2006 edition), the content of the tensile test method was deleted (see 8:3 of the:2006 edition), and the content of the chemical composition test method was added content (see 8:2); u) Changed "Description of Conformity and Testing Documents" to "Certificate of Conformity", and changed the content of this chapter (see Chapter 9,:2006 Chapter 9 of the annual edition): Please note that some contents of this document may refer to patents: The issuing agency of this document assumes no responsibility for identifying patents: This document is proposed and managed by the National Forging Standardization Technical Committee (SAC/TC74): This document is drafted by: China National Machinery Industry Institute Group Beijing Electromechanical Research Institute Co:, Ltd:, Guizhou Hangyu Technology Development Co:, Ltd:, Wuhu Hetian Automobile Industry Co:, Ltd:, Hubei Sanhuan Forging Co:, Ltd:, Shanghai Jiaotong University, Wuhan University of Technology, Jingdezhen Mingxing Aviation Forging Press Co:, Ltd:, Handan Fengchi Precision Manufacturing Co:, Ltd:, Shenzhen Kaizhong Precision Technology Co:, Ltd:, Shenzhen Dafu Fangyuan Forming Technology Co:, Ltd: Technology Co:, Ltd:, China Heavy Machinery Research Institute Co:, Ltd: The main drafters of this document: Zeng Qi, Wei Wei, Li Zhuo, Zou Chaojiang, Pan Qijun, Zhang Yunjun, Zhao Zhen, Hua Lin, Yu Liangliang, Zhang Jungai, Wang Chengbin, Yang Lipeng, Qiu Mingjun, Lin Yutong, Zhang Hua, Hu Baili, Chen Tiantian, Zhang Wen, Han Xinghui, Jiang Tongfei, Shi Xiaomeng, Chen Lei, Wu Liang, Zuo Changbing: This document was first published in:2006, and this is the first revision: Copper and Copper Alloy Forgings

1 Scope

This document specifies the identification, ordering information, technical requirements, sampling, test methods, qualification certificates, and standards for copper and copper alloy forgings: marking, labeling and packaging: This document applies to the manufacture of copper and copper alloy forgings:

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document: GB/T 231:1 Brinell hardness test for metallic materials - Part 1: Test method GB/T 1804-2000 General tolerances Tolerances of linear and angular dimensions without tolerances GB/T 5121 (all parts) Methods for chemical analysis of copper and copper alloys GB/T 8541 Forging Terminology GB/T 10119 Dezincification Corrosion Resistance Determination of Brass GB/T 10567:2 Test method for residual stress of copper and copper alloy processed materials Ammonia fumigation test method ISO 1811-2 Selection and preparation of test pieces for chemical analysis of copper and copper alloys - Part 2: Sampling of processed products and castings

3 Terms and Definitions

The following terms and definitions defined in GB/T 8541 apply to this document: 3:1 hollow die forgings coreddieforgings A product forged into shape in a closed die with pellets: 3:2 inspectionlot Under the same production conditions, a certain number of sample groups with the same cross-sectional size, the same material and material state used for inspection (test) completed test body:

4 logo

4:1 Material grade See Table 1~Table 8 for material grades: Note: Since the materials specified in this document vary greatly, such as forming resistance, forging temperature and pressure, die wear and stress, etc:, they are divided into three groups Similar thermal processing groups (material groups Ⅰ, Ⅱ, Ⅲ, arranged in descending order of thermal processing characteristics), there is a direct proportional relationship between the group and the preheating temperature:

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