GB/T 12363-2021 English PDF (GBT12363-2021)

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GB/T 12363-2021: Classification of forging functions
GB/T 12363-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.85
CCS J 32
Replacing GB/T 12363-2005
Classification of Forging Functions
ISSUED ON: MAY 21, 2021
IMPLEMENTED ON: DECEMBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 6
4 Basic Requirements for Classification of Forging Functions ... 6
5 Methods for Classification of Forging Functions ... 6
6 Technical Conditions, Process Requirements and Acceptance Basis for
Various Forgings ... 7
Classification of Forging Functions
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. Damage to such parts shall only cause partial failure of the product.
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