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GB/T 34201-2017 (GB/T34201-2017)

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GB/T 34201-2017: PDF in English (GBT 34201-2017)
GB/T 34201-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
H 48
Seamless hot-rolled square and
rectangular steel tubes for structure
ISSUED ON. SEPTEMBER 7, 2017
IMPLEMENTED ON. JUNE 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Ordering content ... 6 
4 Dimension, shape and weight ... 7 
5 Technical requirements ... 9 
6 Inspection and test methods ... 13 
7 Inspection rules ... 14 
8 Package, marking, and quality certificate ... 15 
Seamless hot-rolled square and
rectangular steel tubes for structure
1 Scope
This Standard specifies the ordering content, dimension, shape and weight,
technical requirements, inspection and test methods, inspection rules, package,
marking, and quality certificate of seamless hot-rolled square and rectangular
steel tubes for structure.
This Standard is applicable to the seamless hot-rolled square and rectangular
steel tubes for structure.
2 Normative references
The following documents are essential to the application of this document. For
dated references, only the editions with the dates indicated are applicable to
this document. For undated references, only the latest editions (including all the
amendments) are 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 aluminium content --
Chrom azurol S photometric method
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 223.14 Methods for chemical analysis of iron, steel and alloy -- The N-
benzoy-N-phenylhydroxylanmine 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 223.19 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 223.37 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 223.40 Iron, steel and alloy -- Determination of niobium content by the
sulphochlorophenol S spectrophotometric method
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 223.63 Methods for chemical analysis of iron, steel and alloy -- The
sodium (potassium) periodate photometric method for the determination of
manganese content
GB/T 223.72 Iron, steel and alloy -- Determination of sulfur content --
Gravimetric 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 223.86 Iron steel and alloy -- Determination of total carbon content --
Infrared absorption method after combustion in an induction furnace
GB/T 226 Test method for macrostructure and defect of steel by etching
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 699 Quality carbon structure steels
GB/T 700 Carbon structural steels
GB/T 1979 Diagram of a low magnification texture blemish grading of
structural steel
GB/T 2102 Acceptance, packing, marking and quality certification of steel
pipe
GB/T 2975 Steel and steel products -- Location and preparation of test pieces
for mechanical testing
GB/T 3077 Alloy structure steels
GB/T 4336 Carbon and low-alloy steel -- Determination of multi-element
contents -- Spark discharge atomic emission spectrometric method (routine
method)
GB/T 10561-2005 Steel -- Determination of content of nonmetallic inclusions
-- Micrographic method using standards diagrams
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
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
YB/T 4149 Continuously cast round billet for seamless steel tube rolling
YB/T 5221 Alloy structure steel round tube blank hot rolled and forged for
making seamless tube
YB/T 5222 Quality hot rolled and forged carbon structural steel round tube
blank
3 Ordering content
Contracts or orders for ordering steel tubes in accordance with this Standard
shall include the following.
a) standard number;
b) product name;
c) designation and quality grade of steel (if applicable);
d) quantity ordered (total weight or total length);
e) dimensions (side length × side length × wall thickness, in millimeters);
f) delivery status;
g) special requirements.
shall be specified in the contract. The permissible tolerances for chemical
compositions of finished steel tubes shall meet the requirements of GB/T 222.
5.2 Manufacturing method
5.2.1 Steel smelting method
Steel shall be smelted using the method of electric arc furnace plus external
refining or oxygen converter plus external refining. After negotiation between
the supplier and the demander, steel can also be smelted using other methods
with higher requirements. When the demander specifies a certain smelting
method, it shall be specified in the contract.
5.2.2 Billet manufacturing method
Billets shall be manufactured using the method of continuous casting or hot
rolling (forging). Ingots can also be used directly as the billets. Continuously
cast round billets shall comply with the provisions of YB/T 4149, but other higher
quality requirements approved by related parties may also be adopted. Hot-
rolled (forged) round billets shall comply with the requirements of YB/T 5221
and YB/T 5222, respectively.
5.2.3 Steel tube manufacturing method
Steel tubes shall be manufactured using the method of hot rolling (expanding)
for making seamless tube. When the demander specifies a certain
manufacturing method, it shall be specified in the contract.
5.3 Delivery status
Steel tubes shall be delivered under hot rolling (expanding) or heat treatment.
5.4 Mechanical properties
5.4.1 Longitudinal mechanical properties of high-quality carbon structural
steels, carbon structural steels, and low-alloy high-strength structural steels
shall comply with the provisions of Table 3. The steel tube specimen blank made
of 20Mn2 alloy structural steel is heat-treated according to the heat treatment
system recommended in GB/T 3077 and made into a specimen. The measured
longitudinal mechanical properties shall comply with the requirements of Table
3.
5.4.2 The impact absorbed energy in Table 3 is the required value for the
Charpy V-notch impact absorbed energy of the standard-sized specimen. When
a small-sized impact specimen is used, the required value for the Charpy V-
notch impact absorbed energy of the small-sized specimen shall be the
required value for the impact absorbed energy of the standard-sized specimen
multiplied by the decline factor in Table 4. The width of the impact specimen
......
 
(Above excerpt was released on 2018-06-02, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT34201-2017