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GB/T 33821-2017

Chinese Standard: 'GB/T 33821-2017'
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Detail Information of GB/T 33821-2017; GB/T33821-2017
Description (Translated English): Seamless steel tubes for automobile stabilizer bar
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H48
Classification of International Standard: 77.140.75
Word Count Estimation: 10,165
Date of Issue: 2017-05-31
Date of Implementation: 2017-09-01
Quoted Standard: GB/T 222; GB/T 223.5; GB/T 223.9; GB/T 223.12; GB/T 223.14; GB/T 223.23; GB/T 223.26; GB/T 223.53; GB/T 223.59; GB/T 223.63; GB/T 223.68; GB/T 223.69; GB/T 223.78; GB/T 224; GB/T 228.1; GB/T 231.1; GB/T 244; GB/T 246; GB/T 699-2015; GB/T 1222-2007; GB/T 2
Drafting Organization: Jiangsu Huacheng Industrial Pipe Co., Ltd., Jiangsu Dioum Co., Ltd., Shanghai China Spring Manufacturing Co., Ltd., Zhejiang Jin Sheng Auto Parts Co., Ltd., Metallurgical Industry Information Standards Institute
Administrative Organization: National Steel Standardization Technical Committee (SAC/TC 183)
Proposing organization: China Iron and Steel Industry Association
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, China National Standardization Administration Committee
Summary: This standard specifies the order, size, shape, weight and tolerances, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of seamless steel tubes for automotive stabilizers. This standard applies to the manufacture of automotive stabilizer bar with cold drawn or cold rolled seamless steel pipe (hereinafter referred to as steel pipe).

GB/T 33821-2017
GB
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
H 48
Seamless steel tubes for automobile stabilizer bar
汽车稳定杆用无缝钢管
ISSUED ON. MAY 31, 2017
IMPLEMENTED ON. SEPTEMBER 01, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
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Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Order content ... 6 
4 Size, shape, weight ... 7 
5 Technical requirements ... 9 
6 Test method ... 13 
7 Inspection rules ... 14 
8 Packaging, marking and quality certificate ... 15 
Foreword
This standard was drafted in accordance with the rules given in GB/T
1.1-2009.
This standard was proposed by China Iron and Steel Industry Association.
This standard shall be under the jurisdiction of the National Steel
Standardization Technical Committee (SAC/TC 183).
The drafting organizations of this standard. Jiangsu Huacheng Industrial Tube
Co., Ltd., Jiangsu Dioumu Co., Ltd., Shanghai China Spring Manufacturing Co.,
Ltd., Zhejiang Jinsheng Auto Parts Co., Ltd., Metallurgical Industry Information
Standards Institute.
The main drafters of this standard. Han Bo, Lu Jianxin, Zhou Feiyao, Zhang
Jun, Zhou Yongming, Dong Li, Zhou Jinmiao, Yao Zhiqiang.
Seamless steel tubes for automobile stabilizer bar
1 Scope
This standard specifies the order content, size, shape, weight and tolerances,
technical requirements, test methods, inspection rules, packaging, marking
and quality certificates for seamless steel tubes for automotive stabilizer bars.
This standard applies to the old drawn or cold rolled seamless steel tubes used
to manufacture automotive stabilizer bar (hereinafter referred to as steel tube).
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) are applicable to this Standard.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total
silicon content - Reduced molybdosilicate spectrophotometric method
GB/T 223.9 Iron steel and alloy - Determination of aluminum content -
Chrome azurol S photometric method
GB/T 223.12 Methods for chemical analysis of iron, steel and alloy - The
sodium carbonate separation - Diphenyl carbazide photometric method for
the determination of chromium content
GB/T 223.14 Methods for chemical analysis of iron, steel and alloy - The
N-Benzoyl-N-Phenylhydroxylamine extraction photometric method for the
determination of vanadium content
GB/T 223.23 Iron, steel and alloy - Determination of nickel content - The
dimethylglyoxime spectrophotometric method
GB/T 223.26 Iron, steel and alloy- Determination of molybdenum content -
The thiocyanate spectrophotometric method
GB/T 223.53 Methods for chemical analysis of iron, steel and alloy - The
flame atomic absorption spectrophotometric method for the determination
of copper content
GB/T 5777-2008 Seamless steel pipe and tubing methods for ultrasonic
testing
GB/T 6394 Metal - Methods for estimating the average grain size
GB/T 7735-2016 Automated eddy current testing of seamless and welded
(except submerged arc-welded) steel tubes for detection of imperfections
GB/T 10561-2005 Steel - Determination of content of nonmetallic inclusions
- Micrographic method using standards diagrams
GB/T 12606-2016 Automated full peripheral flux leakage testing of
seamless and welded (except submerged arc-welded) ferromagnetic steel
tubes for the detection of longitudinal and/or transverse imperfections
GB/T 13298 Inspection methods of microstructure for metals
GB/T 17395 Dimensions, shapes, masses and tolerances of seamless steel
tubes
GB/T 20066 Steel and iron - Sampling and preparation of samples for the
determination of chemical composition
GB/T 20123 Steel and iron - Determination of total carbon and sulfur
content - Infrared absorption method after combustion in an induction
furnace (routine method)
3 Order content
The contract or order for ordering steel tubes in accordance with this standard
shall include the following.
a) Standard number;
b) Product name;
c) Designation;
d) Size specifications;
e) Order quantity (total weight or total length);
f) Delivery status;
g) Manufacturing method;
5.1.2 Chemical composition (melting analysis) for designations 20Mn2B and
25MnCrAlTiB shall comply with the requirements in Table 4.
Table 4 -- Steel chemical composition
5.1.3 The allowable deviation of chemical composition of the finished steel
tube shall be in accordance with the provisions of GB/T 222.
5.1.4 In accordance with the requirements of the purchaser, as negotiated
between the supplier and the purchaser, AND indicated in the contract, it may
supply the steel tubes of other designations.
5.2 Manufacturing methods
5.2.1 Smelting method of steel
Steel shall be used be subjected to arc furnace plus external furnace refining,
OR oxygen converter plus external furnace refining method for smelting. As
negotiated between the supplier and the purchaser, steel may also be smelted
by other methods of higher requirements. When the purchaser indicates using
a certain smelting method, it shall be noted in the contract.
5.2.2 Manufacturing method of billet
The tube billet shall be manufactured by continuous casting plus hot rolling
(forging) methods OR other higher quality requirements approved by both the
supplier and the purchaser.
5.2.3 Manufacturing method of steel tube
The steel tube shall be made by cold drawing or cold rolling seamless method.
When specifying a manufacturing method, it shall be indicated in the contract.
5.3 Delivery status
The steel tube shall be delivered in an annealed state. As required by the
purchaser AND negotiated between the supplier and the purchaser, the steel
Designation Chemical composition (mass fraction)
a, b /%
a The residual element content in steel shall comply with the following requirements. Cu ≤ 0.20%, Cr ≤ 0.30%, Ni ≤ 0.30%, Mo ≤ 0.30%.
b The residual tungsten, vanadium, and titanium content in steel shall be analysed, AND the results shall be recorded in the quality certificates.
As required by the purchaser, it may limit the content of the residual tungsten, vanadium, and titanium.
separation. These defects shall be completely removed, the removal depth
shall not exceed the negative deviation of the nominal wall thickness, AND the
actual wall thickness at the removal portion shall be not less than the minimum
allowable wall thickness.
5.11 Special requirements
5.11.1 Flattening
In accordance with the requirements of the purchaser, as negotiated between
the supplier and the purchaser, AND indicated in the contract, the steel tube
having a wall thickness to outer diameter ratio of less than 10% may be
subjected to flattening test, AND the distance H between the plates after
flattening the sample is calculated in accordance with the formula (1).
Where.
H - The distance between two plates, in millimeters (mm);
S - The nominal wall thickness of steel tube, in millimeters (mm);
D - The nominal......
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