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QC/T 631-2025: Exhaust muffler assembly of automotive
Status: Valid QC/T 631: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| QC/T 631-2025 | English | 359 |
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4 days [Need to translate]
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Exhaust muffler assembly of automotive
| Valid |
QC/T 631-2025
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| QC/T 631-2009 | English | 399 |
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Automotive exhaust muffler assembly technical specification and test methods
| Valid |
QC/T 631-2009
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| QC/T 631-1999 | English | 399 |
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(Automobile exhaust muffler performance technical conditions)
| Obsolete |
QC/T 631-1999
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Basic data | Standard ID | QC/T 631-2025 (QC/T631-2025) | | Description (Translated English) | Exhaust muffler assembly of automotive | | Sector / Industry | Automobile & Vehicle Industry Standard (Recommended) | | Classification of Chinese Standard | T11 | | Classification of International Standard | 43.060.01 | | Word Count Estimation | 18,174 | | Date of Issue | 2025-05-09 | | Date of Implementation | 2025-11-01 | | Older Standard (superseded by this standard) | QC/T 631-2009 | | Issuing agency(ies) | Ministry of Industry and Information Technology of the People's Republic of China | QC/T 631-2025: Exhaust muffler assembly of automotive---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/QCT631-2025
ICS 43.060.01CCS T 11
Automobile Industry Standards of the People's Republic of China
Released on May 9, 2025
2025-11-01Implementation
Ministry of Industry and Information Technology of the People's Republic of China issued
Automobile exhaust muffler assembly
Replaces QC/T 631-2009
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Technical Requirements 2
5 Test Method 3
6 Inspection Rules 7
7.Marking, packaging, transportation and storage 8
Appendix A (Informative) Muffler Bench Test Report 9
Reference 12
Preface
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 QC/T 631-2009 "Technical conditions and test methods for automotive exhaust muffler assemblies" and is consistent with QC/T 631-2009.
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
--Changed the life requirements of mufflers (see 4.1.4, 4.10 of the.2009 edition);
--Changed the requirements for corrosion resistance (see 4.2, 4.4 of the.2009 edition);
--Changed the relevant requirements for sealing (see 4.3, 4.5 of the.2009 edition);
--Added the modal frequency requirements and test methods for muffler housing and hook (see 4.6 and 5.6);
--Changed the vibration durability requirements and test methods (see 4.7 and 5.7, 4.8 and 5.4 of the.2009 edition);
--Changed the factory inspection requirements (see 6.1.2, 6.1.2 of the.2009 edition);
--The type inspection requirements have been changed (see 6.2.2, 6.2.2 of the.2009 edition).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed and coordinated by the National Technical Committee for Standardization of Automotive Products (SAC/TC 114).
This document was drafted by. Dongfeng Motor Corporation, Wanxiang Tongda Co., Ltd., and Chongqing Changan Automobile Co., Ltd.
The main drafters of this document are. Cai Wenxin, Yan Xinying, Yang Liling, Shi Fulin, and Yu Xun.
The previous versions of this document and the documents it replaces are as follows.
--First issued in.2009 as QC/T 631-2009;
--This is the first revision.
Automobile exhaust muffler assembly
1 Scope
This document specifies the terms and definitions, technical requirements, test methods, inspection regulations, and specifications for automobile exhaust muffler assemblies (hereinafter referred to as "mufflers").
Rules and marking, packaging, transportation and storage.
This document applies to exhaust muffler assemblies for motor vehicles of categories M and N.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.
document.
GB/T 10125 Artificial atmosphere corrosion test Salt spray test
GB/T 15173 Electroacoustic sound calibrator
GB/T 18297 Automobile engine performance test methods
GB/T 20878-2024 Stainless steel grades and chemical composition
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
exhaust systemexhaust system
A complete device that processes the exhaust gas generated when the engine is working and discharges it to the outside (the part between the exhaust hot end outlet and the exhaust tail pipe outlet).
3.2
exhaust muffler assemblyexhaust muffler assembly
The exhaust system is equipped with sound-absorbing materials or special airflow ducts to effectively reduce exhaust noise.
Note. Generally includes single muffler, flange, pipe, hook, etc. Single muffler is a component that can independently play a role in silencing and constitute the exhaust muffler assembly.
3.3
Leak proofness
The degree of sealing of the muffler.
Note. Expressed in terms of air leakage.
3.4
exhaust noiseexhaust noise
The sound produced when the exhaust gas generated by the engine is discharged from the exhaust pipe port.
3.5
background noise
The noise of the surrounding environment (including wind noise) when the exhaust noise being measured is not present.
3.6
Insertion loss
The difference in exhaust noise A-weighted sound pressure level before and after the muffler is installed.
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