GB/T 41324-2022 PDF in English
GB/T 41324-2022 (GB/T41324-2022, GBT 41324-2022, GBT41324-2022)
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Fire-resistant weathering steels for structure
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GB/T 41324-2022: PDF in English (GBT 41324-2022) GB/T 41324-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.01
CCS H 46
Fire-resistant weathering steels for structure
ISSUED ON: MARCH 09, 2022
IMPLEMENTED ON: OCTOBER 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions... 6
4 Designation representation ... 6
5 Order content ... 7
6 Size, shape and weight ... 7
7 Technical requirements ... 8
8 Test methods ... 16
9 Inspection rules ... 17
10 Packaging, marking and quality certificate ... 18
Appendix A (Normative) Evaluation method for atmospheric corrosion resistance .. 19
Appendix B (Normative) Relative corrosion rate determination method ... 20
Fire-resistant weathering steels for structure
1 Scope
This document specifies the size, shape, weight, technical requirements, test methods,
inspection rules, packaging, marking and quality certificates of fire-resistant weathering
steels for structure.
This document applies to hot-rolled steel plates and strips and hot-rolled section steels
with fire resistance and atmospheric corrosion resistance for the manufacture of general
structures and building structures.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
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 223.9, Iron, steel and alloy - Determination of aluminium content - Chrome
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-
benzoyl-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 223.18, Methods for chemical analysis of iron steel and alloy - The sodium
thiosulfate separation iodometric method for the determination of cupper 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 223.60, 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 223.68, 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 223.69, Iron, steel and alloy - Determination of carbon contents - Gas-
volumetric method after combustion in the pipe furnace
GB/T 223.79, Iron and steel. Determination of multi-element contents. X-ray
fluorescence spectrometry (Routine method)
GB/T 228.1, Metallic materials - Tensile testing - Part 1: Method of test at room
temperature
GB/T 228.2, Metallic materials. Tensile testing. Part 2:Method of test at elevated
temperature
GB/T 229, Metallic materials - Charpy pendulum impact test method
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 706, Hot rolled section steel
GB/T 709, Dimension shape weight and tolerances for hot-rolled steel plates and
sheets
GB/T 2101, General requirement of acceptance, packaging, marking and
certification for section steel
GB/T 2970, Method for ultrasonic testing of thicker steel plates
GB/T 2975, Steel and steel products - Location and preparation of samples and 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 judgment
of limiting values
GB/T 11263, Hot rolled H and cut T section steel
GB/T 14977, General requirement for surface condition of hot-rolled steel plates
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 20125, Low-alloy steel - Determination of multi-element contents -
Inductively coupled plasma atomic emission spectrometric method
YB/T 4427, General requirements for surface condition of hot-rolled sections
YB/T 4811, Ultrasonic testing of hot rolled H section steel
3 Terms and definitions
The following terms and definitions are applicable to this document.
3.1
Fire-resistant weathering steels for structure
Steels whose fire resistance and atmospheric corrosion resistance are improved by
adding an appropriate amount of alloying elements such as molybdenum, copper,
chromium, etc.
4 Designation representation
4.1 Fire-resistant weathering steels for structure are represented by designation plus
quality grade. The designation of steels consists of three parts: the initial letter "Q" in
Chinese pinyin "Qu" representing “yield strength”, the specified minimum upper yield
strength value, and the suffix "FRW" representing "fire-resistance weathering"; the
quality grade code is represented by B, C, D, E.
7.6 Ultrasonic testing
7.6.1 When there are requirements for through-thickness characteristics, the steel plate
shall be ultrasonically tested in accordance with GB/T 2970, and the section steel shall
be ultrasonically tested in accordance with YB/T 4811, where the qualification grade
shall be indicated in the contract.
7.6.2 When it is required by the buyer, other steels can also be subjected to ultrasonic
testing. The test method and qualification grade shall be negotiated by the supplier and
the buyer, and shall be indicated in the contract.
7.7 Surface quality
7.7.1 Steel plate
7.7.1.1 There shall be no harmful defects such as air bubbles, scabs, folds, inclusions,
and iron oxide scale pressing on the surface of the steel plate that affect the use, and the
steel plate shall not have visible delamination.
7.7.1.2 The surface of steel plate is allowed to have a thin layer of iron oxide scale, rust,
and inconspicuous roughness, reticulation, pitting, scratches and other local defects
caused by pressing into the iron oxide scale and rollers that do not affect the use, but
the depth shall not be greater than one-half of the thickness tolerance of the steel plate,
and the allowable minimum thickness of the steel plate shall be guaranteed.
7.7.1.3 The surface defects of steel plate are allowed to be removed by grinding and
other methods. The cleaning place shall be smooth without edges and corners; the
cleaning depth shall not be greater than the lower deviation of the thickness of the steel
plate; the minimum allowable thickness of the steel shall be guaranteed.
7.7.1.4 After it is negotiated between the supplier and the buyer, and indicated in the
contract, the surface quality of the steel plate may also meet the requirements of GB/T
14977.
7.7.2 Steel strip and its sheared steel plate
7.7.2.1 The surface of steel strip shall not have any harmful defects such as scabs, cracks,
folds, inclusions, air bubbles and indentation of iron oxide scales that affect the use; the
steel strip shall not have visible delamination.
7.7.2.2 The surface of steel strip is allowed to have local defects such as thin iron oxide
scale, rust, slight pitting, and scratches that do not affect the use, but the depth or height
shall not exceed one-half of the thickness tolerance of the steel strip, and the minimum
allowable thickness of the steel strip shall be guaranteed.
7.7.2.3 The steel strip is allowed to be delivered with local defects, but the part with
defects shall not exceed 6% of the total length of each coil of steel strip.
7.7.2.4 After it is negotiated between the supplier and the buyer, and indicated in the
contract, the surface quality of the steel strip can also meet the requirements of GB/T
14977.
7.7.3 Section steel
7.7.3.1 The surface quality of hot-rolled section steel shall comply with the provisions
of GB/T 706; the surface quality of hot rolled H section steel shall comply with the
provisions of GB/T 11263.
7.7.3.2 After it is negotiated between the supplier and the buyer, and indicated in the
contract, the surface quality of section steel can also meet the requirements of YB/T
4427.
7.8 Special requirements.
After it is negotiated between the supplier and the buyer, and indicated in the contract,
other special technical requirements, such as the maximum force total elongation Agt
and so on, can be put forward for the steel.
8 Test methods
8.1 The chemical composition analysis method of steel shall be carried out according
to GB/T 4336, GB/T 20123, GB/T 20125 or general methods, and the arbitration shall
be carried out according to GB/T 223.3, GB/T 223.9, GB/T 223.11, GB/T 223 .14, GB/T
223.17, GB/T 223.18, GB/T 223.23, GB/T 223.26, GB/T 223.40, GB/T 223.60, GB/T
223.63, GB/T 223.68 , GB/T 223.69, GB/T 223.79 and GB/T 20125.
8.2 The test methods for other inspection items of steel shall comply with the provisions
in Table 10.
9 Inspection rules
9.1 Batch rules
9.1.1 The steels shall be submitted for inspection and acceptance in batches, and each
batch shall consist of steel plates, strips or section steels of the same designation, heat
number, specification, rolling system, and delivery state.
9.1.2 In general, the weight of each batch shall not exceed 60 t. For different product
types, batches can also be grouped according to the following regulations:
-- Continuously rolled steel plates and strips with a rolled coil weight greater than
30 t can be batched into two rolled coils;
-- For section steels, smelted in a converter, with a volume greater than 200 t, the
weight of each batch shall not be greater than 80 t;
-- The steel plate with through-thickness characteristics shall conform to the
provisions of GB/T 5313.
9.1.3 The batch rules for high temperature tensile test shall be determined through
negotiation between the supplier and the buyer, and shall be indicated in the contract.
9.2 Sampling quantity and sampling portion
The sampling quantity and sampling portion of steel shall comply with the requirements
in Table 10.
9.3 Re-inspection and determination rules
The re-inspection and determination rules of steel inspection items shall comply with
the provisions of GB/T 17505 or GB/T 2101.
9.4 Numerical rounding
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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