GB/T 711-2017 (GBT711-2017)

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GB/T 711-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 711-2008, GB/T 710-2008
Hot-Rolled Quality Carbon
Structural Steel Plates Sheets and Strips
ISSUED ON. FEBRUARY 28, 2017
IMPLEMENTED ON. NOVEMBER 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 Ordering Contents . 6
4 Dimension, Appearance, Weight . 6
5 Technical Requirements .. 6
6 Test Methods . 12
7 Inspection Rules . 13
8 Package, Marking and Quality Certificate .. 14
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard combined and modified the following standards like GB/T 710-2008 Hot-
Rolled Quality Carbon Structural Steel Sheets and Strips, GB/T 711-2008 Hot-rolled
Quality Carbon Structural Steel Plates, Sheets and Wide Strips.
This Standard replaced GB/T 710-2008 Hot-Rolled Quality Carbon Structural Steel
Sheets and Strips, GB/T 711-2008 Hot-rolled Quality Carbon Structural Steel Plates,
Sheets and Wide Strips; compared with GB/T 710-2008 and GB/T 711-2008, this
Standard has the major technical changes as follows.
--- Cancel the relevant brand of boiling steel;
--- Cancel the pull-edge level;
--- Increase three brands of 35Mn, 55Mn, 70Mn (see Table 1, Table 2, Table 3);
--- Tighten the control harmful elemental sulfur in steel (see Table 1);
--- Adjust the delivery status of some brands (see Table 2).
This Standard was proposed by China Iron and Steel Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Steel (SAC/TC 183).
Drafting organizations of this Standard. Chongqing Iron & Steel Company Limited,
Angang Steel Company Limited, China Metallurgical Information and Standardization
Institute, Shougang Co., Ltd., Xinyu Iron & Steel Co., Ltd., and Hebei Iron and Steel
Co., Ltd. Tangshan Branch.
Chief drafting staffs of this Standard. Du Dasong, Ye Guohua, Pu Zhimin, Zhang Weixu,
Shi Li, Liao Sangsang, Deng Cuiqing, Xie Caozhong, Guan Jichun, Yang Juanyu, Gao
Yan, Wang Xin, Liu Xuyuan, Su Haolu.
The historical editions replaced by this Standard are as follows.
--- GB/T 710-1998, GB/T 710-1991, GB/T 710-2008;
--- GB/T 711-1985, GB/T 711-1988, GB/T 711-2008.
Hot-Rolled Quality Carbon
Structural Steel Plates Sheets and Strips
1 Scope
This Standard specifies the dimension, appearance, weight, technical requirements,
test methods, inspection rules, package, marking and quality certificate of the hot-
rolled quality carbon structural steel plates sheets and strips.
This Standard is only applicable to the hot-rolled quality carbon structural steel plates
sheets and strips with thickness no greater than 100mm, width no less than 600mm
(hereinafter referred to as steel sheets and strips).
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 document.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.5 Methods for Chemical Analysis of Iron, Steel and Alloy - The Reduced
Molybdosilicate Spectrophotometric Method for The Determination of Acid-Soluble
Silicon Content
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 223.19 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 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Dimethylglyoxime Spectrophotometric Method for The Determination of Nickel
Content
GB/T 223.37 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Indophenol Blue Photometric Method for the Determination of Nitrogen Content
after Distillation Separation
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 223.64 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
Combustion Potassium Iodate Volumetric Method for the Determination of Sulfur
Content
GB/T 223.86 Steel and Iron - Determination of Total Carbon Content - Infrared
Absorption Method after Combustion in an Induction Furnace
GB/T 224 Determination of Depth of Decarburization of Steels
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1. Method of Test at Room
Temperature
GB/T 229 Metallic Materials – Charpy Notch Impact Test
GB/T 232 Metallic Materials – Bend Test
GB/T 247 General Rule of Package Mark and Certification for Steel Plates (Sheets)
and Strips
GB/T 709 Dimensions, Shape, Weight and Tolerances for Hot Rolled Steel Sheets
and Strips
GB/T 2970 Thicker Steel Plate - Method for Ultrasonic Inspection
GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for
Mechanical Testing
GB/T 4336 Carbon and Low-Alloy Steel - Determination of Multi-Element Contents
-Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 6394 Metal - Methods for Estimating the Average Grain Size
GB/T 8170 Rules of Rounding off for Numerical Values & Expression and
Judgement of Limiting Values
GB/T 13298 Inspection Methods of Microstructure for Metals
GB/T 13299 Steel – Determination of Microstructure
half thickness tolerance of steel plate and strip; the allowable minimum thickness of
steel plate and strip must be guaranteed.
5.10.3 The local defects on the surface of the steel plate and strip are allowed to be
cleaned; while the clean-up area shall be smooth and edge-free; the allowable
minimum thickness of steel plate and strip must be guaranteed.
5.10.4 During the continuous production of steel strips, local surface defects are not
easily found and removed; so, delivery with defects is allowed; however, the defective
part shall not exceed 6% total length of each roll of steel strip.
5.10.5 Steel plate with thickness greater than 30mm is allowed for flame trimming;
however, the steel plate requires the heat treatment shall take flame trimming before
heat treatment.
5.10.6 The surface quality characteristics of each level of steel strip and shear steel
plates shall conform to the provisions of Table 6.
Table 6 -- Surface Quality Characteristics of Each Level of Steel Plate and Strip
Levels and
codes
Applicable surface
treatment modes Characteristics
Ordinary
surface (FA)
Rolled surface
Pickled surface
The surface is allowed to have pits, concaves, scratches,
and other slight and local defects of which the thickness (or
height) shall not exceed half thickness tolerance of the steel
strip; however, the allowable minimum thickness of steel
plate and strip must be guaranteed; the following local
defects are also allowed to have such as serrated edges,
partially uncut edges, lack of pickling, parking spots, etc.
Higher surface
(FB) Pickled surface
The surface is not allowed to have the local defects that may
influence the formability, such as slight scratches, slight
indentations, slight pits, slight roll marks, chromatic
aberration, etc.; the surface is allowed to have slight parking
spots after oiling; however, the surface is not allowed to have
the lack of or over pickling defects.
6 Test Methods
6.1 The analysis method for chemical compositions of steel shall be performed as
per the provisions of GB/T 223.5, GB/T 223.12, GB/T 223.19, GB/T 223.23, GB/T
223.37, GB/T 223.59, GB/T 223.64, GB/T 223.68, GB/T 223.86, GB/T 4336, GB/T
20123, GB/T 20125, and general method; however, the arbitration shall be performed
as per the provisions of GB/T 223.5, GB/T 223.12, GB/T 223.19, GB/T 223.23, GB/T
223.37, GB/T 223.59, GB/T 223.64, GB/T 223.68, GB/T 223.86.