GB/T 12363-2021Classification of forging functions (English PDF)
锻件功能分类
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Issued by
State Administration for Market Regulation; Standardization Administration of China
Level / Type
National · Recommended
Issue date
May 21, 2021
Implementation date
December 1, 2021
Scope
GB/T 12363-2021 is the English-translated version of 锻件功能分类.
GB/T 12363-2021 sets out how forgings are sorted into function classes and what follows from the class given.
It fixes the basic requirements and the classification method, then the technical conditions, process requirements and acceptance basis for each class: class IV takes in parts carrying a low load with a low strength requirement and a high safety factor, while class I and class II forgings must carry traceability marks, may not be reheated more than twice, have their quality-critical inspection items sampled at no less than one piece per batch, and keep their process and inspection records for at least three years.
It applies to metal open-die forgings, die forgings and special forgings. It quotes GB/T 8541, GB/T 12361 and GB/T 32249. It replaces GB/T 12363-2005, was issued on 21 May 2021 and has applied since 1 December 2021.
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Document preview — GB/T 12363-2021
National Standard of the People's Republic of China
- ICS
- 77.140.85
- Classification
- J32
Issued by: State Administration for Market Regulation; Standardization Administration of China
Contents
- Foreword3
- 1 Scope5
- 2 Normative References5
- 3 Terms and Definitions6
- 4 Basic Requirements for Classification of Forging Functions6
- 5 Methods for Classification of Forging Functions6
- 6 Technical Conditions, Process Requirements and Acceptance Basis for Various Forgings7
1 Scope
This Document specifies the basic requirements and methods for the classification of forging functions, as well as the technical conditions, process requirements and acceptance basis for various forgings.
This Document is applicable to metal free forgings, die forgings and special forgings.
2 Normative References
The following documents are essential to the application of this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document.
GB/T 8541 Terminology of Forging and Stamping
GB/T 8545 Die Forgings of Aluminium and Aluminium Alloy - Dimensional Tolerance and Machining Allowance
GB/T 12361 General Specification of Steel Die Forgings
GB/T 12362 Steel Die Forgings - Tolerance and Machining Allowance
GB/T 25137 Titanium and Titanium Alloy Forgings
GB/T 26639 General Specifications for Open Die Forgings on Hydraulic Press
GB/T 29532 General Specification for Steel Precision Hot Die Forgings
GB/T 32249 Aluminium and Aluminium-Alloy Die Forgings, Hand Forgings and Rolled Ring Forgings - General Specification
GB/T 32258 Steel Cross Wedge Rollings - General Specification
GB/T 33212 Steel Open Die Forgings on Hammer - General Specifications The prat that is used to withstand a fixed load, but are not subject to shock and vibration working conditions
5 Methods for Classification of Forging Functions
5.2.4 Class-IV forgings
The part that is used to withstand low load, low strength requirement and high safety factor; and other forgings other than the above three categories.
6 Technical Conditions, Process Requirements and Acceptance Basis for Various Forgings
6.1 Technical conditions
The classification of forgings can be related to the advance planning of forgings, the failure mode of forgings and the input and control that influence the analysis.
After the classification of forgings, different categories of forgings shall be treated differently in terms of technical process requirements, quality control, and production management.
6.2 Process requirements
6.2.1 Various forgings shall be prepared the corresponding process specifications and forging processes during the design of the forging process against the different forgings in the fields of with low or no oxidation heating, heating temperature control and sorting, metal deformation process methods, consistency of the forging process, reasonable selection of equipment, and final forging temperature control, etc.; meanwhile it shall comply with the provisions of GB/T 8545, GB/T 12361, GB/T 12362,
GB/T 25137, GB/T 26639, GB/T 29532, GB/T 32249, GB/T 32258, GB /T 33212, etc.
6.2.2 The heating of various forgings blanks shall be equipped with separation devices for the qualified, over-temperature, and under-temperature process; and over-burned parts shall be rejected as waste. Among them, the number of repeated heating for Class-I and Class-II forgings shall not exceed twice.
6.2.3 Class-I and Class-II forgings shall have traceability marks, which shall be incorporated into security parts and important parts for management and control. Raw material suppliers shall conduct supplier management. Products shall be verified when developing new suppliers to ensure the stable and reliable quality of the materials. The changes in forging production line and process shall be verified and approved; and the inspection items involving intrinsic quality shall be randomly checked for no less than 1 piece per batch. The process and inspection records shall be kept for at least three years. When the purchaser has special requirements, the quality records shall be kept for the period that shall meet requirements of the contract between the supplier and […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 8 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 8541Terminology of forging and stamping
- GB/T 8545Aluminium alloy forgings
- GB/T 12361Steel die forgings - General specification
- GB/T 12362Steel die forgings - Tolerance and machining allowance
- GB/T 25137Titanium and titanium alloy forgings
- GB/T 26639General specifications for open die forgings on hydraulic press
Cited by
- GB/T 17116.1-2018Pipe supports and hangers - Part 1: Technical specification
- YC/T 10.9-2018Tobacco machinery. General requirements - Part 9: Forgings
- JB/T 12942-2016High pressure tube fittings with end-formed tubes
- YC/T 10.9-2006Tobacco machinery. General requirements - Part 9: Forgings
- YC/T 10.9-1993Tobacco machinery. General requirements - Part 9: Forgings
Similar standards
Editions of GB/T 12363
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 12363-2021 | Classification of forging functions | current edition | Current |
| GB/T 12363-2005 | Classification of forging function | previous edition | Superseded |
This page sells the current edition, GB/T 12363-2021. Earlier editions are listed for reference only.
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Related Standards
GB/T 12361-2016 — Steel die forgings - General specification
GB/T 12362-2016 — Steel die forgings - Tolerance and machining allowance
GB/T 25137-2010 — Titanium and titanium alloy forgings
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