GB/T 28415-2023 PDF in English
GB/T 28415-2023 (GB/T28415-2023, GBT 28415-2023, GBT28415-2023)
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Fire-resistant structural steel plate, sheet and strip
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| GB/T 28415-2012 | English | 399 |
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Fire-resistant structural steel plate and strip
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GB/T 28415-2023: PDF in English (GBT 28415-2023) GB/T 28415-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
CCS H 46
Replacing GB/T 28415-2012
Fire-resistant structural steel plate, sheet and strip
ISSUED ON: AUGUST 06, 2023
IMPLEMENTED ON: MARCH 01, 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 content ... 8
6 Size, shape, weight... 8
7 Technical requirements ... 9
8 Test methods ... 18
9 Inspection rules ... 19
10 Packaging, marking and quality certificate ... 20
Fire-resistant structural steel plate, sheet and strip
1 Scope
This document specifies designation expression method, ordering content, size, shape,
weight, technical requirements, test methods, inspection rules, packaging, marking and
quality certificates of fire-resistant structural steel plates, sheets and strips.
This document applies to steel plates with a thickness of no more than 150 mm and
steel sheets and strips with a thickness of no more than 25.4 mm and sheared steel plates
(hereinafter referred to as steel plates, sheets and strips) that are mainly used to
manufacture general structures and engineering structures with fire resistance.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
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 diantipyryl
methane 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 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 223.60, 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, Iron, steel and alloy -- Determination of manganese content -- Sodium
(potassium) periodate spectrophotometric 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 223.69, 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 709, Dimension, shape, weight and tolerance for hot-rolled steel strip, plate
and sheet
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 properties
GB/T 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
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
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 fire-resistant structural steel
The steel that a certain content of alloying elements such as Mo, Cr, etc. is added to the
steel to improve the fire resistance.
4 Designation expression method
4.1 The designation of fire-resistant structural steel consists of the initial letter "Q" in
Chinese pinyin of the word "Qu" representing yield strength, the specified lower limit
value of the upper yield strength, the initial letter "FR" of English representing "fire
resistance" and the quality grade (codenamed B, C, D or E).
NOTE: Q+ specifies the lower limit value of upper yield strength + FR, referred to as "steel grade".
Example: Q420FRD, where:
Q - the initial letter "Q" in Chinese pinyin of the word "Qu" representing yield strength;
420 - the specified lower limit value of the upper yield strength, in megapascals (MPa);
FR - the initials of "fire resistant" in English;
D - the quality grade is D.
4.2 When steel plates, sheets and strips are required to have thickness-direction
properties, a symbol representing the thickness-direction (Z-direction) performance
of the steel plate thickness. The minimum allowable thickness of the steel plate shall be
ensured.
7.5.1.3 Surface defects of steel plates are allowed to be removed by grinding and other
methods. The cleaning area shall be smooth and without edges. The cleaning depth shall
not be greater than the negative deviation of the steel plate thickness. The minimum
allowable thickness of the steel plate shall be ensured.
7.5.1.4 If there are defects on the surface of the steel plate that cannot be cleaned
according to the provisions of 7.5.1.3, welding repair can be carried out after
negotiation between the supplier and the purchaser. The following requirements shall
be met:
a) Use appropriate welding methods;
b) Before welding repairs, use appropriate methods such as leveling or grinding to
completely remove harmful defects on the steel plate. The depth of the removed
portion is within 20% of the nominal thickness of the steel plate. The total
grinding area on one side shall be within 2% of the steel plate area;
c) There shall be no undercut or overlap on the edges of the welded parts of the steel
plates. The pile height shall be more than 1.5 mm higher than the rolling surface.
Then remove the pile height by leveling or grinding;
d) Heat treated steel plates shall be heat treated again after welding and repair.
7.5.1.5 After negotiation between the supplier and the purchaser, and stated in the
contract, the surface quality of the steel plate can be in accordance with the provisions
of GB/T 14977.
7.5.2 Steel sheets and strips, sheared steel plates
7.5.2.1 The surfaces of the steel sheets and strips shall not have scars, cracks, folds,
inclusions, air bubbles, and intrusion of iron oxide scale that would affect the use and
other harmful defects. The steel sheets and strips shall have no visible delamination.
7.5.2.2 The surfaces of the steel sheets and strips are allowed to have local defects such
as a thin layer of iron oxide scale, rust, slight pitting, scratches, etc. that do not affect
the use. However, its depth or height shall not exceed half of the steel sheet and strip
thickness tolerance. The allowable minimum thickness of the steel sheet and strip shall
be ensured.
7.5.2.3 The steel sheets and strips are allowed to be delivered with local defects, but the
defective part shall not exceed 6% of the total length of each coil of steel sheets and
strips.
7.5.2.4 After negotiation between the supplier and the purchaser, and stated in the
contract, the surface quality of the steel sheet and strip can be in accordance with the
corresponding
accuracy
9 Inspection rules
9.1 Inspection and acceptance
The inspection and acceptance of steel plates, sheets and strips are carried out by the
supplier's quality inspection department.
9.2 Batching rules
9.2.1 Steel plates, sheets and strips shall be accepted in batches. Each batch shall be
composed of steel plates or steel sheets and strips of the same designation, the same
heat number, the same thickness, the same rolling system, and the same delivery status.
The weight of each batch shall not exceed 60 t. Steel sheets and strips and continuous
rolled plates with rolled coils larger than 30 t can be batched into two rolled coils.
9.2.2 For steel plates, sheets and strips requiring thickness direction properties, the
batch assembly rules shall comply with the provisions of GB/T 5313.
9.3 Sampling quantity
The sampling quantity of each batch of steel plates, sheets and strips shall comply with
the requirements in Table 10.
9.4 Reinspection and judgement rules
9.4.1 The reinspection and judgment of steel plates, sheets and strips shall comply with
the provisions of GB/T 17505.
9.4.2 Suppliers are allowed to heat-treat or re-heat-treat steel plates that fail the
thickness direction performance reinspection and then submit them for acceptance as a
new batch.
9.4.3 The supplier is allowed to re-heat-treat the steel plates that fail the heat treatment
delivery reinspection and submit them for acceptance as a new batch.
9.5 Numerical rounding
The inspection results of steel plates, sheets and strips shall be rounded using the
rounding value comparison method. Carbon equivalent (CEV) and welding crack
susceptibility index (Pcm) shall be calculated according to formula (1) and formula (2)
first and then rounded. The rounding off rules shall comply with the provisions of GB/T
8170.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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