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GB/T 19879-2023 PDF in English


GB/T 19879-2023 (GB/T19879-2023, GBT 19879-2023, GBT19879-2023)
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GB/T 19879-2023: PDF in English (GBT 19879-2023)

GB/T 19879-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
CCS H 46
Replacing GB/T 19879-2015
Steel Plate for Building Structure
ISSUED ON: SEPTEMBER 7, 2023
IMPLEMENTED ON: APRIL 1, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 7
4 Designation Expression Method ... 7
5 Ordering Contents ... 8
6 Size, Shape, and Weight ... 8
7 Technical Requirements ... 9
8 Test Methods ... 15
9 Inspection Rules ... 16
10 Packaging, Marking and Quality Certificate ... 17
Steel Plate for Building Structure
1 Scope
This Document specifies the designation expression method, ordering content, size, shape,
weight, technical requirements, test methods, inspection rules, packaging, marking and quality
certificates of steel plate for building structure.
This Document is applicable to the manufacture of high-performance hot-rolled steel plate
(hereinafter referred to as steel plate) with a thickness of 6mm~200mm for building structures,
long-span structures and other steel structures. Hot-rolled steel strips can also be implemented
with reference to this Document.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in 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) is applicable to this Document.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content
- Reduced molybdosilicate spectrophotometric method
GB/T 223.9 Iron steel and alloy - Determination of aluminum content - Chrom azurol S
photometric method
GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual Titration
or Potentiometric Titration Method
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 223.19 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 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content - The
Thiocyanate Spectrophotometric Method
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 223.62 Methods for chemical analysis of iron, steel and alloy - The butyl acetate
extraction photometric method for the determination of phosphorus content
GB/T 223.78 Methods for Chemical Analysis of Iron, Steel and Alloy - Curcumin
Spectrophotometric Method for the Determination of Boron Content
GB/T 223.79 Iron and steel—Determination of multi-element contents—X-ray
fluorescence spectrometry (Routine method)
GB/T 223.81 Iron steel and alloy - Determination of total aluminum and total boron
contents -Microwave digestion-inductively coupled plasma mass spectrometric method
GB/T 223.82 Steel and iron—Determination of hydrogen content—Thermal
conductivity/infrared method after fusion under inert gas
GB/T 223.84 Steel and iron - Determination of titanium content - Diantipyrylmethane
spectrophotometric method
GB/T 223.85 Steel and iron - Determination of sulfur content - Infrared absorption method
after combustion in an induction furnace
GB/T 223.86 Steel and iron - Determination of total carbon content - Infrared absorption
method after combustion in an induction furnace
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 229 Metallic materials – Charpy pendulum impact test method
GB/T 232 Metallic materials – Bend test method
GB/T 247 General rule of package, mark and certification for steel plates (sheets) and
strips
GB/T 709-2019 Dimension, shape, weight and tolerance for hot-rolled steel strip, plate
and sheet
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 5313 Steel plate with through-thickness characteristics
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of
limiting values
GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements
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)
GB/T 20124 Steel and iron - Determination of nitrogen content - Thermal conductimetric
method after fusion in a current of inert gas
GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively
coupled plasma atomic emission spectrometric method
3 Terms and Definitions
For the purposes of this Document, there are no terms and definition apply.
4 Designation Expression Method
The designation of steel consists of four parts, namely, the first letter "Q" in Chinese Pinyin for
"Qu" of yield strength, the specified minimum yield strength value, the first letter "GJ" in
Chinese Pinyin for "Gao Jian" of steel for high-performance building structures, and the quality
grade symbol (B, C, D, E).
EXAMPLE: Q355GJC
Q - The first letter "Q" in Chinese Pinyin for "Qu" of yield strength;
355 – The specified minimum yield strength value;
GJ - The first letter "GJ" in Chinese Pinyin for "Gao Jian" of steel for high-performance building
structures;
C - Quality grade symbol.
For steel plates with thickness direction performance, the thickness direction performance level
(Z15, Z25 or Z35) shall also be added after the designation.
When there are thickness direction performance requirements for steel plates with a thickness
of no less than 15mm, the section shrinkage corresponding to the thickness direction
performance level shall comply with the provisions of GB/T 5313.
7.5 Surface quality
7.5.1 There shall be no cracks, bubbles, scars, folds, inclusions and pressed-in iron oxide scale
on the surface of the steel plate. Steel plates shall not have visible delamination.
7.5.2 The surface of the steel plate is allowed to have thin layers of iron oxide scale, rust,
inconspicuous surface roughness, scratches, indentations and other local defects caused by the
peeling off of pressed iron oxide scale that do not hinder the inspection of surface defects, but
their depth shall be no greater than half of the thickness tolerance, and the minimum thickness
of the steel plate shall be guaranteed.
7.5.3 Surface defects of the steel plate are allowed to be ground and cleaned. The ground and
cleaned areas shall be smooth and without edges; and the minimum thickness of the steel plate
shall be ensured. Welding repair of steel plates is not allowed.
7.6 Ultrasonic testing
Steel plates with thickness direction performance shall be ultrasonic tested one by one in
accordance with GB/T 2970, and the qualification level is Level-III. Other steel plates can also
be ultrasonic tested one by one according to the requirements of the buyer and the provisions
of GB/T 2970, and the qualification level shall be specified in the contract. Upon agreement
between the two parties, other documents may be used for ultrasonic testing, and the testing
documents and qualification levels shall be noted in the contract.
7.7 Other requirements
According to the requirements of the purchaser and upon agreement between the two parties,
the purchaser may put forward other requirements for the steel plate and indicate them in the
contract.
8 Test Methods
8.1 The inspection items, sampling quantity, specimen direction, sampling method, and test
method of each batch of steel plates shall comply with the provisions of Table 7.
8.2 The chemical composition test of steel is generally conducted in accordance with GB/T
4336, GB/T 20123, GB/T 20124, GB/T 20125 or general chemical analysis methods. During
arbitration, the provisions of the following standards shall be followed, such as GB/T 223.5,
GB/T 223.9, GB/T 223.11, GB /T 223.14, GB/T 223.19, GB/T 223.23, GB/T 223.26, GB/T
223.40, GB/T 223.58, GB/T 223.62, GB/T 223.78, GB/T 223.79, GB/T 223.81, GB/T 223.82,
GB/T 223.84, GB/T 223.85, and GB/T 223.86.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.