GB/T 11253-2007 English PDF (GBT11253-2007)

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GB/T 11253-2007: Cold-rolled sheets and strips of carbon structural steels
GB/T 11253-2007
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 11253-1989
Cold-rolled Sheets and Strips of
Carbon Structural Steels
(ISO 4997.1999 Cold-reduced carbon steel sheet of structural quality, NEQ)
ISSUED ON. OCTOBER 25, 2007
IMPLEMENTED ON. APRIL 01, 2008
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine (AQSIQ);
Standardization Administration (SAC) of the People's
Republic of China.
Table of Contents
1 Scope ... 4 
2 Normative References ... 4 
3 Classification and Code Number ... 6 
4 Order Contents ... 6 
5 Dimension, Appearance, Weight and Allowable Deviation ... 7 
6 Technical Requirements ... 7 
7 Test Method ... 10 
8 Inspection Rules ... 11 
9 Packing, Mark and Quality Certificate ... 11 
Reference... 12 
Foreword
The consistent degree between this standard and ISO 4997.1999 Cold-reduced Steel
Sheet of Structural Quality is not equivalent.
This standard replaces GB/T 11253-1989 Cold-rolled Plain Carbon and Low Alloy
Structural Steel Sheets and Strips. Compared with the previous standard, the main
changes in this standard are as follows.
-- the thickness range is modified as "not be greater than 3mm";
-- the order contents is added;
-- the supply state and requirements of oiling the surface for the steel sheets and
steel strips are added;
-- the designation and chemical composition of steel are modified;
-- the gauge length of measuring post-fracture elongation rate is modified, and the
post-fracture elongation rate is reset;
-- the surface quality for steel strips is classified, allowable malformation is reduced
to 6% from 8%.
This standard was proposed by China Iron and Steel Association.
This standard shall be under the jurisdiction of National Technical Committee on Iron
and Steel of Standardization Administration of China.
The main drafting organizations of this standard. Angang Steel Company Limited,
Metallurgical Information and Standardization Institute and Guangdong Entry-Exit
Inspection and Quarantine Bureau.
Chief drafting staffs of this standard. Wang Yue, Wang Xiao Hu, Chen Yue, Piao
Zhimin, Li Chengming.
This standard was issued in 1989 for the first time.
Cold-rolled Sheets and Strips of Carbon
Structural Steels
1    Scope 
This standard specifies the dimension, appearance, weight and allowable deviation,
technical requirements, test methods, test rules and mark, package, transportation,
reposition as well as the Certification of Quality for the cold-rolled sheets and strips of
carbon structural steels.
This standard is applicable to the cold-rolled sheets and strips of carbon structural
steels of which the thickness is not greater than 3mm and the width is not less than
600mm. The single cold-rolled sheet may also refer to this standard for
implementation.
2    Normative References   
The following documents contain the provisions which, through reference in this text,
constitute the provisions of this standard. For dated reference, subsequent
amendments (excluding corrigendum) or revisions of these publications do not apply.
However, all parties who enter into agreement according to this standard are
encouraged to study whether the latest edition of these documents is applicable. For
undated references, the latest edition of the normative document is 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 223.10 Methods for chemical analysis of iron, steel and alloy - The cupferron
separation-chrome azurol S photometric method for the determination of
aluminium content
GB/T 223.11 Methods for chemical analysis of iron, steel and alloy - The
ammonium persulfate oxidation volumetric method for the determination of
chromium content
GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - The sodium
thiosulfate separation iodimetric method for the determination of copper content
GB/T 223.19 Methods for chemical analysis of iron steel and alloy - The
neocuproine-chloroform extraction photometric method for the determination of
copper content
GB/T 223.24 Methods for chemical analysis of iron, steel and alloy - The extraction
seperation - The dimethylglyoxime spectrophotometric method for the
determination of nickel content
GB/T 223.32 Methods for chemical analysis of iron, steel and alloy - The
hypophosphite reduction-iodimetric method for the determination of arsenic
content
GB/T 223.37 Methods for chemical analysis of iron steel and alloy - The
indophenal blue photometric methods for the determination of nitrogen content
after distillation separation
GB/T 223.58 Methods for chemical analysis of iron, steel and alloy - The sodium
arsenite-sodium nitrite titrimetric method for the determination of manganese
content
GB/T 223.59 Methods for chemical analysis of iron, steel and alloy - The reduced
molybdoantimonyl phosphoric acid photometric method for the determination of
phosphorus 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 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium
(potassium) periodate photometric method for the determination of manganese
content
GB/T 223.64 Methods for chemical analysis of iron, steel and alloy - The flame
atomic absorption spectrometric method for the determination of manganese
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 223.71 Methods for chemical analysis of iron, steel and alloy - The
gravimetric method after combustion in the pipe furnace for the determination of
carbon content
GB/T 223.72 Methods for chemical analysis of iron, steel and alloy - The alumina
chromatographic separation-barium sulfate gravimetric method for the
determination of sulphur content
GB/T 228 Metallic materials - Tensile testing at ambient temperature (GB/T
228-2002, eqv ISO 6892.1998)
GB/T 232 Metallic materials - Bend test (GB/T 232-1999, eqv ISO 7438.1985)
GB/T 247 General rule of package mark and certification for steel plates (sheets)
and strips
GB/T 708 Dimension shape weight and tolerance for cold-rolled steel plates and
sheets
GB/T 2975 Steel and steel products - Location and preparation of test pieces for
mechanical testing (GB/T 2975-1998, eqv ISO 377.1997)
GB/T 4336 Standard test method for spark discharge atomic emission
spectrometric analysis of carbon and low-alloy steel (routine method)
GB/T 17505 Steel and steel products - General technical delivery requirements
(GB/T 17505-1998, eqv ISO 404.1992)
GB/T 20066 Steel and iron - Sampling and preparation of samples for the
determination of chemical composition (GB/T 20066-2006, ISO 14284.1996, IDT)
3    Classification and Code Number   
3.1 According to the surface quality, the steel sheets and steel strips are divided
into.
the higher grade surface FB
the highest grade surface FC
3.2 According to the surface structure, the steel sheets and steel strips are divided
into....