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

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

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.
GB/T 11253-2007
GB
NATIONAL STANDARD OF THE
PEOPLE 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.
Glossy surface B. Be characterized by finishing rollers with a grinder. Rough surface D. Be characterized by achieving the shot blasting after roll grinder process is finished.
4 Order??Contents
4.1 The customer shall provide the following information while ordering. a) Serial Number of Standard;
b) Product name (steel sheets or steel strips);
c) Designation;
d) Dimension;
e) Dimension and the accuracy of unevenness;
f) Coil size (internal diameter and external diameter);
g) Weight;
h) Grade of surface quality;
i) Rim condition (Edge Cutting, EC; Mill Edge, EM);
j) Packing manner;
k) Purpose;
l) Special requirements (the requirements which are not specified in this standard).
4.2 If the information related to dimension and the accuracy of unevenness, grade of surface quality, rim condition and packing manner are not noted in the purchase contract, then the products in this standard shall be supplied according to the ordinary grade's dimension and accuracy of unevenness, the higher grade surface quality of edge cutting steel sheets or steel strips, and the packing manner shall be adopted according to the requirements of supplier.
5 Dimension,??Appearance,??Weight??and??Allowable??Deviation
The dimension, appearance, weight and allowable deviation of the steel sheets and steel strips shall meet the requirements of GB/T 708.
6 Technical??Requirements
6.1 Designation and chemical composition
6.1.1 The designation and chemical...

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