GB 912-2008 English PDF (GB912-2008)

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GB 912-2008: [GB/T 912-2008] Hot-rolled sheets and strips of carbon structural steels and high strength low alloy structural steels
GB 912-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 912-1989
Hot-rolled Sheets and Strips of Carbon
Structural Steels and High Strength Low Alloy
Structural Steels
(ISO 4995.2001 (E), ISO 4996.1999 (E) NEQ)
ISSUED ON. OCTOBER 24, 2008
IMPLEMENTED ON. OCTOBER 1, 2009
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine (AQSIQ);
Standardization Administration (SAC) of the People's
Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Ordering Information ... 6 
4 Size, Appearance, Weight and Permissible Deviation ... 7 
5 Technical Requirements ... 7 
6 Test Methods ... 9 
7 Inspection Rules ... 9 
8 Packing, Marking and Quality Certificate ... 9 
9 Rounding off of Numerical Values ... 10 
Foreword
This standard is the compulsory-provisions standard; 5.1.2, 5.4.1, 5.4.3 and 8.2
are the compulsory clauses.
This standard is not equivalent to "Hot-rolled Steel Sheet of Structural Quality" (ISO
4995. 2001 (E)) and "Hot-rolled Steel Sheet of High Yield Stress Structural Quality"
(ISO 4996.1999 (E)).
This standard replaces "Hot-rolled Sheets and Strips of Carbon Structural Steels and
High Strength Low Alloy Structural Steels" (GB/T 912-1989). Compared with GB/T
912-1989, the main changes of this standard are as follows.
— Change from voluntary standard to standard with compulsory-provisions;
— Delete the content related to ply-rolling steel plate in the former standard;
— Adjust the thickness range of products;
— Add the "ordering information";
— Change the delivery state;
— Modify the requirements of surface quality.
This standard was proposed by China Iron and Steel Association.
This standard shall be under the jurisdiction of the National Technical Committee on
Iron and Steel of Standardization Administration of China.
Chief drafting organizations of this standard. Guangdong Entry-Exit Inspection and
Quarantine Bureau, Metallurgical Information and Standardization Institute and Benxi
Iron and Steel (group) Co. Ltd.
Chief drafting staffs of this standard. Li Chengming, Peng Xiaogang, Wang Xaiohu,
Zhang Zhenkun, Zhou Qi, Zhang Xianfeng, Liu Jianbin, Cao Biao and Pei Yu.
The previous edition replaced by this standard is as follows.
— GB/T 912-1989.
Hot-rolled Plates and Strips of Carbon Structural
Steels and High Strength Low Alloy Structural Steels
1 Scope
This standard specifies the ordering information, size, appearance, weight and
permissible deviation, technical requirements, test methods, inspection rules, packing,
marking and quality certificate of hot-rolled plates and strips of carbon structural steels
and high strength low alloy structural steels.
This standard is applicable to hot-rolled plates and strips of carbon structural steels
and high strength low alloy structural steels with thickness less than 3 mm.
2 Normative References
The following standards contain provisions which, through reference in this text,
constitute provisions of this standard. For dated reference, subsequent amendments
to, or revisions of, any of these publications do not apply. However, all parties coming
to an 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 these specifications.
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 223.5 Steel and Iron - Determination of Acid-soluble Silicon and Total Silicon
Content - Reduced Molybdosilicate Spectrophotometric Method
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 223.14 Methods for Chemical Analysis of Iron, Steel and Alloy - The
N-benzoy-N-phenylhydroxylamine Extraction Photometric Method for the
Determination of Vanadium Content
GB/T 223.17 Methods for Chemical Analysis of Iron Steel and Alloy - The
Diantipyrylmethane Photometric Method for the Determination of Titanium Content
GB/T 223.1 8 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 223.23 Iron Steel and Alloy - Determination of Nickel Content - The
Dimethylglyoxime Spectrophotometric Method
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 223.40 Iron Steel and Alloy - Determination of Niobium Content by the
Sulphochlorophenol S Spectrophotometric Method
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 Iron Steel and Alloy - Determination of Phosphorus Content-Bismuth
Phosphomolybdate Blue Spectrophotometric Method and Antimony
Phosphomolybdate Blue Spectrophotometric Method
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 Iron Steel and Alloy - Determination of Manganese Content - Flame
Atomic Absorption Spectrometric Method
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 223.7 2 Iron Steel and Alloy - Determination of Sulfur Content-Gravimetric
Method
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 Acceptance, Package, Mark and Certification for Steel
Plates (Sheets) and Strips
GB/T 700 Carbon Structural Steels
GB/T 709 Dimension, Shape, Weight and Tolerances for Hot-rolled Steel Plates
and Sheets
GB/T 1591 Low-alloy Structural Steels
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 18253 Steel and Steel Products - Types of Inspection Documents (GB/T
18253-2000, eqv ISO 10474.1991)
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)
YB/T 081 Rule for Rounding off of Numberical Values and Judgement of Testing
Values for Technical Standards of Metallurgy
3 Ordering Information
3.1 The order contract or order according to this standard shall include the following
contents.
a) Serial number of standard;
b) Product name (steel plate, steel strip or section steel);
c) Designation;
d) Size;
e) Rim condition (trimmed EC and non-trimmed EM);
f) Thickness precision (PT.A and PT.B);
g) Weight;
h) Delivery condition;
i) Usage;
j) Special requirements.
3.2 If no definite contents about e) and f) are in procurement contract, the following
requirements may be used.
a) Sheet and strip are generally non-trimmed in delivered, and the steel plate
sheared by the sheet and strip is generally trimmed in delivered;
b) Thickness precision is the general precision (Category PT. A).
4 Size, Appearance, Weight and Permissible Deviation
The size, shape, weight and permissible deviation for s...