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GB/T 32796-2016 PDF in English


GB/T 32796-2016 (GB/T32796-2016, GBT 32796-2016, GBT32796-2016)
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GB/T 32796-2016: PDF in English (GBT 32796-2016)

GB/T 32796-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Cold rolling ferritic stainless steel sheet and strip for
automotive exhaust system
ISSUED ON. AUGUST 29, 2016
IMPLEMENTED ON. JULY 01, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Classification and code ... 7 
4 Order content ... 7 
5 Size, shape, weight and allowable deviation ... 8 
6 Technical requirements ... 12 
7 Test methods ... 15 
8 Inspection rules ... 16 
9 Packing, marking and quality certificate ... 17 
Appendix A (Informative) Operating temperature and recommended
designations of different components for automobile exhaust system ... 18 
APPENDIX B (Informative) Ferritic stainless steel sheets and strips - Basic
physical properties ... 19 
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Iron and Steel Association.
The standard shall be under the jurisdiction of the National Steel
Standardization Technical Committee (SAC/TC 183).
The main drafting organizations of this standard. Baosteel Stainless Steel Co.,
Ltd., Metallurgical Industry Information Standards Research Institute, Ningbo
Baoxin Stainless Steel Co. Ltd.
The main drafters of this standard. Xu Zhongjie, Bi Hongyun, Zhang Weixu, Ke
Keli, Li Xin, Dong Li, Zhu Yiying, He Pan.
Guidelines for recoverable material selection of
electrical and electronic products
1 Scope
This standard specifies the classification, code, order content, size, shape,
mass and allowable deviation, technical requirements, test methods, inspection
rules, packaging, marking and quality certificate of cold rolling ferritic stainless
steel sheet and strip for automotive exhaust system.
This standard applies to the cold rolling ferritic stainless steel wide strip AND its
sheared sheet and longitudinally cut wide stripe with a thickness of 0.4 mm ~
3.0 mm (abbreviated as steel sheet and strip) for automotive exhaust system.
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 223.3 Methods for chemical analysis of iron, steel and alloy - The
diantipyrylmethane phosphomolybdate gravimetric method for the
determination of phosphorus content
GB/T 223.4 Alloyed steel - Determination of manganese content -
Potentiometric or visual titration method
GB/T 223.5 Method for chemical analysis of iron, steel and alloy - The
reduced molybdosilicate spectrophotometric method for the determination of
acid-soluble silicon content
GB/T 223.11 Iron, steel and alloy - Determination of chromium content -
Visible titration or potentiometric titration method
GB/T 223.16 Methods for chemical analysis of iron, steel and alloy - The
chromotropic acid photometric method for the determination of titanium
content
GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - The
sodium thiosulfate separation iodometric method for the determination of
copper content
GB/T 223.19 Methods for chemical analysis of iron, steel and alloy - The
NHCM-trichloromethane extraction spectrophotometry for the determination
of copper content
GB/T 223.23 Iron, steel and alloy - Determination of nickel content - The
dimethylglyoxime spectrophotometric method
GB/T 223.25 Methods for chemical analysis of iron, steel and alloy - The
dimethylglyoxime gravimetric method for the determination of nickel content
GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content -
The thiocyanate spectrophotometric method
GB/T 223.28 Methods for chemical analysis of iron, steel and alloy - The
alpha-benzoinoxime gravimetric method for the determination of
molybdenum content
GB/T 223.36 Method for chemical analysis of iron, steel and alloy – The
neutral titration method for the determination of nitrogen content after
distillation separation
GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the
Chlorosulfonol S 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 223.58 Methods for chemical analysis of iron, steel and alloy - The
sodium arsenite-sodium nitrite titration method for the determination of
manganese content
GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The
perchloric acid dehydration gravimetric method for the determination of
silicon content
GB/T 223.61 Methods for chemical analysis of iron, steel and alloy - The
ammonium phosphomolybdate volumetric method for the determination of
phosphorus content
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy - The
potassium iodate titration method after combustion in the pipe furnace for the
determination of sulfur content
GB/T 223.69 Iron, steel and alloy - Determination of carbon - Gas-volumetric
method after combustion in pipe furnaces
GB/T 228.1-2010 Metallic materials - Tensile testing - Part 1. Method of test
at room temperature
GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1. Test
methods (scales A, B, C, D, E, F, G, H, K, N, T)
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1. Test methods
GB/T 232 Metallic materials - Bend test
GB/T 247 General rules of acceptance, package, mark and certification for
steel sheets and strips
GB/T 708-2016 Dimensions, shape, weight and tolerance for cold-rolled
steel plate
GB/T 2975 Steel and steel products - Location and preparation of test pieces
for mechanical testing
GB/T 3280 Cold rolled stainless steel plate, sheet and strip
GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1. Test method
GB/T 8170 Rules for rounding off for numerical values & expression and
judgment of limiting values
GB/T 11170 Stainless steel - Determination of multi-element contents - Spark
discharge atomic emission spectrometric method (Routine method)
GB/T 14203 General rules for spark discharge atomic emission spectrometry
GB/T 17505 Steel and steel products - General technical requirements for
delivery
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)
rolling marks, or color difference the depth of which is less than half of the
thickness tolerance.
6.6.2.3 The edge of the steel strip shall be flat. It is not allowed for the edge
cutting steel strip edge to have irregular cutting the depth of which is more than
half of the width tolerance OR the burrs more than the thickness tolerance of
the steel strips; AND it is not allowed for the edge uncut steel strips to have
edge crack which is more than width tolerance.
6.7 Special requirements
As required by the buyer, it may make special requirements for the steel
chemical composition, mechanical properties, plastic strain rate (r value),
tensile strain hardening index (n value), non-metallic inclusions, corrosion
resistance (intergranular corrosion and cyclic corrosion), high-temperature
fatigue mechanical properties, and anti-oxidation properties, AND the specific
contents shall be determined by the supplier and the buyer through negotiation.
7 Test methods
7.1 Test methods for chemical composition
The steel chemical composition shall comply with the provisions of GB/T 223.3,
GB/T 223.4, GB/T 223.5, GB/T 223.11, GB/T 223.16, GB/T 223.18, GB/T
223.19, GB/T 223.23, GB/T 223.25, GB/T 223.26, 223.28, GB/T 223.38, GB/T
223.40, GB/T 223.53, GB/T 223.58, GB/T 223.60, GB/T 223.61, GB/T 223.68,
GB/T 223.69, GB/T 11170, GB/T 14203, GB/T 20123, GB/T 20124 and GB/T
20125.
7.2 Inspection items, sampling quantity, sampling methods and location,
and test methods of steel sheets and strips
The inspection items, sampling quantity, sampling methods and location, and
test methods of each batch of steel sheets and strips shall comply with the
provisions of Table 12.
Table 12 Test items, sampling quantity, sampling methods and location
and test methods
No. Inspection items Sampling quantity Sampling method and location Test methods
1 Chemical composition 1 per furnace GB/T 20066 7.1
2 Tensile test 1 per batch
GB/T 2975
GB/T 228.1-2010
3 Hardness 1 per batch
GB/T 230.1, GB/T
231.1, GB/T
4340.1
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.