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GB/T 12228-2025: General purpose industrial valves - Technical specification for carbon steel forgings
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 12228-2025	English	299	Add to Cart	3 days [Need to translate]	General purpose industrial valves - Technical specification for carbon steel forgings
GB/T 12228-2006	English	70	Add to Cart	0--9 seconds. Auto-delivery	General purpose industrial valves - Specification of carbon steel forgings
GB/T 12228-1989	English	199	Add to Cart	2 days [Need to translate]	General purpose industrial valves. Specification of carbon steel forgings

GB/T 12228-2025: General purpose industrial valves - Technical specification for carbon steel forgings

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ICS 23.060.01 CCSJ16 National Standards of the People's Republic of China Replaces GB/T 12228-2006 Technical Specifications for Carbon Steel Forgings of General-Purpose Valves Published on 2025-10-31 Implemented on May 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of contents

Preface III 1.Scope 1 2 Normative References 1 3.Terms and Definitions 1 4.Technical Requirements 1 4.1 General Requirements 1 4.2 Forging 1 4.3 Heat Treatment 2 4.4 Chemical composition 2 4.5 Mechanical Properties 3 4.6 Quality Requirements 3 4.7 Forging Grade 4 4.8 Metallographic Examination 4 4.9 Non-destructive testing 4 5.Test Methods 4 5.1 Chemical Analysis 4 5.2 Tensile Test 5 5.3 Hardness Test 5 5.4 Impact Test 5 5.5 Metallographic Examination 5 5.6 Non-destructive testing 5 6 Inspection Rules 5 7.Ordering Requirements 5 8.Markings and quality certificates 5 Table 1.Heat Treatment Methods and Temperatures 2 Table 2 Chemical Composition 2 Table 3 Mechanical Properties Table 4.Charpy V-notch Impact Energy Requirements for Standard Size Specimens (10mm × 10mm) 3 Table 5 Inspection Items for Forgings 4

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document replaces GB/T 12228-2006 "Technical Conditions for Carbon Steel Forgings of General Valves". Compared with GB/T 12228-2006, Apart from structural adjustments and editorial changes, the main technical changes are as follows. a) The scope has been changed (see Chapter 1, Chapter 1 of the.2006 edition); b) The forging requirements have been changed (see 4.2, 3.2 in the.2006 edition); c) The heat treatment requirements have been changed (see 4.3, 3.3 in the.2006 edition); d) The requirements for chemical composition have been changed (see 4.4, 3.4 in the.2006 edition); e) The mechanical performance requirements have been changed (see 4.5, 3.5 in the.2006 edition); f) Added low-temperature impact test requirements for LF2 and LF6 (see 4.5.2); g) The quality requirements have been revised (see 4.6, 3.6 in the.2006 edition); h) The forging grade information has been changed (see 4.7, 3.7 in the.2006 edition); i) The requirements for metallographic inspection have been increased (see 4.8); j) Added requirements for non-destructive testing (see 4.9); k) Added experimental methods for chemical analysis (see 5.1); l) The test method for tensile testing has been changed (see 5.2, 4.1 of the.2006 edition); m) Added metallographic testing methods (see 5.5); n) The test methods for nondestructive testing have been changed (see 5.6, 4.4 of the.2006 edition); o) The contents of the markings and quality certificates have been changed (see Chapter 8, Chapter 7 of the.2006 edition). Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China Machinery Industry Federation. This document is under the jurisdiction of the National Technical Committee on Valve Standardization (SAC/TC188). This document was drafted by. Anhui Tunxi High Pressure Valve Co., Ltd., Hefei General Machinery Research Institute Co., Ltd., and Jiangsu Suyan Valve Co., Ltd. Door Machinery Co., Ltd., Fangyuan Valve Group Co., Ltd., Southwest Pipeline Co., Ltd. of China Pipeline Network Group, Chengdu Chenggao Valve Co., Ltd. Limited Company, Tianjin Better Fluid Control Valve Co., Ltd., Zhejiang Petrochemical Valve Co., Ltd., Yancheng Aokaimingtong Valve Co., Ltd., Jiangsu Tenglong Petrochemical Machinery Co., Ltd., Jiangsu Mingtongfulu Fluid Control Equipment Co., Ltd., Hefei Tong'an Engineering Machinery Equipment Supervision Co., Ltd. Shanghai Ya'ao Valve Co., Ltd., Zhongtai Valve Co., Ltd., Zhejiang Bell Control Valve Co., Ltd., Zhejiang Lianda Forging & Pressing Co., Ltd., Shanxi Fuxingtong Heavy Ring Forging Co., Ltd., Jiangsu Hengda Machinery Manufacturing Co., Ltd. The main drafters of this document are. Wu Zhijun, Hu Jun, Zhang Rongwei, Han Zhenghai, Wu Zhifeng, Mu Yanyun, Li Dongming, Xiao Donghai, Li Bo, and Dai Yiming. Huang Jingsheng, Zhou Qinkai, Liu Liyan, Cheng Qiang, Hu Bowu, Lin Feng, Yu Mingliang, Yan Jiangtao, Yan Pengtao, Chen Jianyu. This document was first published in 1989, revised for the first time in.2006, and this is the second revision. Technical Specifications for Carbon Steel Forgings of General Valves

1 Scope

This document specifies the technical requirements, test methods, inspection rules, ordering requirements, marking, and quality certificates for carbon steel forgings used in general valves. Ming Dynasty book. This document applies to the design, production, and inspection of pressure-bearing carbon steel forgings for general-purpose valves; other carbon steel forgings can refer to this document for further information.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 150.4 Pressure Vessels - Part 4.Manufacturing, Inspection and Acceptance GB/T 223 (all parts) Chemical Analysis Methods for Iron and Steel and Alloys GB/T 228.1 Metallic materials – Tensile testing – Part 1.Test method at room temperature GB/T 229 Metallic materials Charpy impact test method GB/T 231.1 Metallic materials – Brinell hardness test – Part 1.Test method GB/T 4336 Determination of Multi-Element Content in Carbon Steel and Medium-Low Alloy Steels by Spark Discharge Atomic Emission Spectrometry (Conventional Method) GB/T 6394 Method for Determination of Average Grain Size of Metals GB/T 10561-2023 Standard rating chart microscopic examination method for the determination of non-metallic inclusion content in steel GB/T 13298 Examination Methods for Metallic Microstructure GB/T 20066 Sampling and Sample Preparation Methods for the Determination of Chemical Composition of Steel and Iron GB/T 20123 Determination of Total Carbon and Sulfur Content in Iron and Steel - Infrared Absorption Method After Combustion in a High-Frequency Induction Furnace (Conventional Method) NB/T 47008 Carbon steel and alloy steel forgings for pressure equipment NB/T 47013.3 Non-destructive testing of pressure equipment - Part 3.Ultrasonic testing NB/T 47013.4 Non-destructive testing of pressure equipment - Part 4.Magnetic particle testing NB/T 47013.5 Non-destructive testing of pressure equipment - Part 5.Penetrant testing

3 Terms and Definitions

This document does not contain any terms or definitions that need to be defined. 4.Technical Requirements 4.1 General Requirements Carbon steel forgings (hereinafter referred to as "forgings") can be made of materials of grades 20, 25, 35, A105, LF2 and LF6. 4.2 Forging 4.2.1 Forging steel shall be smelted in an electric furnace or oxygen converter and be killed steel that has been refined outside the furnace. ...