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GB/T 3087-2022 PDF in English


GB/T 3087-2022 (GB/T3087-2022, GBT 3087-2022, GBT3087-2022)
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GB/T 3087-2022: PDF in English (GBT 3087-2022)

GB/T 3087-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
CCS H 48
Replacing GB/T 3087-2008
Seamless steel tubes and pipes for low and medium pressure
boiler
ISSUED ON: APRIL 15, 2022
IMPLEMENTED ON: NOVEMBER 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 ... 5 
2 Normative references ... 5 
3 Terms and definitions... 7 
4 Order content ... 7 
5 Size, shape, weight and allowable deviation ... 7 
6 Technical requirements ... 10 
7 Test methods ... 14 
8 Inspection rules ... 15 
9 Packaging, marking and quality certificate ... 16 
Seamless steel tubes and pipes for low and medium pressure
boiler
1 Scope
This document specifies the order content, size, shape, weight and allowable deviation,
technical requirements, test methods, inspection rules, packaging, marking and quality
certificate of seamless steel tubes and pipes for low and medium pressure boilers.
This document applies to the manufacture of high-quality carbon structural steel
seamless steel tubes and pipes for low and medium pressure boilers (hereinafter referred
to as "steel pipes"); it can be referred to by other seamless steel tubes and pipes for
pipelines.
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 223.5, Steel and iron - Determination of acid-soluble silicon and total silicon
content - Reduced molybdosilicate spectrophotometric 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 223.19, 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 223.37, Iron, steel and alloy - Determination of nitrogen content - Indophenol
blue spectrophotometric method 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 223.63, Methods for chemical analysis of iron, steel and alloy - The sodium
(potassium) periodate photometric method for the determination of manganese
content
GB/T 223.85, 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 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 228.2, Metallic materials. Tensile testing. Part 2:Method of test at elevated
temperature
GB/T 241, Metal materials - Tube - Hydrostatic pressure test
GB/T 242, Metal materials. Tube. Drift-expending test
GB/T 244, Metallic materials - Tube - Bend test method
GB/T 246, Metallic materials - Tube - Flattening test
GB/T 2102, Acceptance, packing, marking and quality certification of steel pipe
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 5777-2019, Automated full peripheral ultrasonic testing of seamless and
welded (except submerged arc-welded) steel tubes for the detection of longitudinal
and/or transverse imperfections
GB/T 17395, Dimensions, shapes, masses and tolerances of seamless steel tubes
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 30062, Terminology of steel pipes and tubes
GB/T 40080, Nondestructive testing of steel tubes - Automated electromagnetic
testing of seamless and welded (except submerged arc-welded) steel tubes for the
verification of hydraulic leak tightness
YB/T 4149, Continuously cast round billet for seamless steel tube rolling
YB/T 5222, Quality hot rolled and forged carbon structural steel round tube blank
3 Terms and definitions
Terms and definitions determined by GB/T 30062 are applicable to this document.
4 Order content
A contract or order for the ordering of steel pipes under this document shall include the
following:
a) number of this document;
b) product name:
c) steel designation;
d) dimensions;
e) ordering quantity (total weight or total length);
f) delivery status;
g) special requirements.
5 Size, shape, weight and allowable deviation
5.1 Outside diameter and wall thickness
The nominal outer diameter (D) and nominal wall thickness (S) of the steel pipe shall
comply with the provisions of GB/T 17395. According to the requirements of the buyer,
6.2.1 Smelting method of steels
Steels shall be smelted by the method of electric arc furnace plus out-of-furnace refining
or oxygen converter plus out-of-furnace refining. After it is negotiated between the
supplier and the buyer, and indicated in the contract, other smelting methods with higher
requirements can be used for manufacturing. When the buyer specifies the smelting
method, it shall be indicated in the contract.
6.2.2 Manufacturing method of tube blank
The tube blank can be manufactured by continuous casting, die casting or hot rolling
(forging). The continuously cast tube blank shall comply with the provisions of YB/T
4149; the hot rolled (forged) tube blank shall comply with the provisions of YB/T 5222;
the die cast tube blank can be implemented with reference to the provisions of the hot
rolled (forged) tube blank.
6.2.3 Manufacturing method of steel pipes
Steel pipes shall be manufactured by hot-rolled (expanded) or cold-drawn (rolled)
seamless method. When the buyer specifies the manufacturing method of steel pipes, it
shall be indicated in the contract.
6.3 Delivery state
6.3.1 Hot rolled (expanded) steel pipes shall be delivered in hot rolled (expanded) or
normalized state.
6.3.2 When delivered in the hot rolled (expanded) state, the final rolling (expanding)
temperature of the steel pipe shall not be lower than the critical phase transition
temperature (Ar3).
6.3.3 When delivered in the normalized state, for hot-rolled (expanded) steel pipes,
when the final rolling (expanding) temperature is not lower than the critical phase
transition temperature (Ar3) and the steel pipes are air-cooled, the steel pipes shall be
considered as normalized.
6.3.4 Cold drawn (rolled) steel pipes shall be delivered in a normalized state.
6.4 Mechanical property
6.4.1 Tensile at room temperature
The longitudinal tensile properties of the steel pipes at room temperature in the delivery
state shall meet the requirements of Table 6.
R – allowable stress, which shall be 60% of the specified yield strength, in megapascals
(MPa);
D – nominal outer diameter of the steel pipe, in millimeters (mm).
6.6.2 The supplier may use the automated electromagnetic testing specified in GB/T
40080 to replace the hydraulic testing.
6.7 Macro-structure
Steel pipes directly rolled from ingots shall be subject to macro-structure inspection.
There shall be no white spots, inclusions, subcutaneous air bubbles, peeling and
delamination on the acid leaching test piece of the macro-structure inspection cross-
section of the steel pipe.
6.8 Surface quality
6.8.1 There shall be no cracks, folds, scars, rolling folds and delamination on the inner
and outer surfaces of the steel pipes. The above defects shall be completely removed;
the depth of removal shall not exceed 10% of the nominal wall thickness; the actual
wall thickness of the cleaned part shall not be less than the minimum allowable wall
thickness; the removal part shall have a smooth transition.
6.8.2 The depth of the straight (including non-sharp mandrel scratches) on the inner and
outer surfaces of the steel pipe shall meet the following requirements:
a) For cold-drawn (rolled) steel pipes: not more than 4% of the wall thickness, and
not more than 0.3 mm;
b) For hot-rolled (expanded) steel pipes: not more than 5% of the wall thickness, and
not more than 0.5 mm.
6.8.3 Other local imperfections not exceeding the deviation under the wall thickness
are allowed.
6.9 Ultrasonic testing
According to the requirements of the buyer, if it is negotiated between the supplier and
the buyer, and indicated in the contract, the steel pipe can be subjected to ultrasonic
testing, where the acceptance level shall meet the requirements of U2.5 in GB/T 5777-
2019.
7 Test methods
7.1 Sampling for chemical composition analysis of steel pipes shall comply with the
provisions of GB/T 20066. For chemical composition analysis, follow the provisions of
GB/T 4336, GB/T 20123, GB/T 20124 or other general methods; for the arbitration,
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.