GB/T 3087-2022 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 3087-2022 | English | 260 |
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Seamless steel tubes and pipes for low and medium pressure boiler
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| GB 3087-2008 | English | 85 |
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[GB/T 3087-2008] Seamless steel tubes for low and medium pressure boiler
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| GB 3087-1999 | English | 279 |
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Seamless steel tubes for low and medium pressure
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| GB 3087-1982 | English | RFQ |
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Seamless steel tubes for low and medium pressure boiler
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GB/T 3087-2022: Seamless steel tubes and pipes for low and medium pressure boiler---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT3087-2022
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
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
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;
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,
after negotiation between the supplier and the buyer, steel pipes with dimensions other
than those specified in GB/T 17395 can be supplied.
5.2 Allowable deviation of outer diameter and wall thickness
5.2.1 The allowable deviation of the outer diameter of the steel pipe shall meet the
requirements in Table 1.
5.2.4 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 with the allowable deviation
of dimensions other than those specified in Table 1, Table 2, and Table 3 can be supplied.
5.3 Length
5.3.1 Normal length
The normal length of the steel pipe is 4 000 mm ~ 12 000 mm. After it is negotiated
between the supplier and the buyer, and indicated in the contract, steel pipes other than
the normal length can be supplied.
5.3.2 Fixed length and multiple length
5.4 Bending
5.4.1 The bending per meter of the steel pipe shall meet the requirements of Table 4.
5.5 Out-of-roundness and uneven wall thickness
According to the requirements of the buyer, if it is negotiated between the supplier and
the buyer, and indicated in the contract, the out-of-roundness and uneven wall thickness
of the steel pipe shall not exceed 80% of the outer diameter and wall thickness
allowances, respectively.
5.6 End shape
5.6.1 For a steel pipe whose nominal outer diameter is more than 60 mm, the inclination
of the pipe end shall not exceed 1.5 mm; for a steel pipe whose nominal outer diameter
is more than 60 mm, the inclination of the pipe end shall not exceed 2.5% of the nominal
outer diameter of the steel pipe, and shall not exceed 6 mm.
5.6.2 The burr of the pipe end cut shall be removed.
5.7 Weight
5.7.1 Steel pipes can be delivered according to actual weight and the theoretical weight.
The theoretical weight of the steel pipe is calculated according to the provisions of
GB/T 17395, and the density of the steel shall be 7.85 kg/dm3.
5.7.2 According to the requirements of the buyer, if it is negotiated between the supplier
and the buyer, and indicated in the contract, the deviation between the actual weight
and the theoretical weight of the delivered steel pipe shall meet the following requirements.
6 Technical requirements
6.1 Steel designation and chemical composition
6.1.1 The steel designation and chemical composition (melting composition) shall
comply with the requirements in Table 5.
6.1.2 When the buyer requires finished product analysis, it shall be indicated in the
contract. The allowable deviation of the chemical composition of the finished steel pipe
shall comply with the provisions of GB/T 222.
6.2 Manufacturing method
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.
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).
6.4 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.
6.4.2 Tensile at high temperature
6.4.2.1 When the buyer indicates in the contract that the steel pipe is used for the
superheated steam pipe for medium pressure boiler, the high temperature specified
plastic elongation strength (Rp0.2) of the steel pipe shall meet the requirements in Table
7, and the inspection may not be carried out if the supplier can guarantee it.
6.5 Process performance
6.5.1 Flattening
6.5.2 Flaring
According to the requirements of the buyer, if it is negotiated between the supplier and
the buyer, and indicated in the contract, the flaring test can be done for the steel pipe
with a wall thickness not greater than 10 mm. The angle of the top core in the flaring
test is 60°. The flaring rate of the outer diameter of the sample after flaring shall meet
the requirements in Table 8, and the sample shall not have cracks or breaches after flaring.
6.5.3 Bending
The steel pipe with an outer diameter of not more than 22 mm shall be subjected to a
bending test. The bending angle is 90°, and the radius of the bending die is 6 times the
outer diameter of the steel pipe. After the sample is bent, there shall be no cracks or
breaches at the bend.
6.6 Hydraulic
6.6.1 The steel pipes shall be subjected to a hydraulic test one by one. The test pressure
is calculated according to Formula (2). The maximum test pressure of the steel pipe
with the designation 10 is 7.0 MPa, and the maximum test pressure of the steel pipe
with the designation 20 is 10.0 MPa. Under the test pressure, the voltage stabilization
time shall be no less than 5 s; the steel pipe shall not leak.
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.
6.9 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,
follow the provisions of GB/T 223.5, GB/T 223.12, GB/T 223.19, GB/T 223.23, GB/T
223.37, GB/T 223.59, GB/T 223.63, GB/T 223.85, GB/T 223.86.
7.2 The size and shape of the steel pipe shall be measured one by one by gauges that
meet the accuracy requirements.
7.3 The inner and outer surfaces of the steel pipe shall be inspected visually under full
lighting conditions.
7.4 The sampling methods and test methods for other inspection items of steel pipes
shall meet the requirements of Table 9.
8 Inspection rules
8.1 Inspection and acceptance
The inspection and acceptance of steel pipes shall be carried out by the technical quality
supervision department of the supplier.
8.2 Batching rules
8.2.1 Steel pipes shall be inspected and accepted in batches.
8.2.2 If the steel pipe is not subjected to heat treatment after being cut into single pieces,
all pipe sections cut from a steel pipe rolled from a tube blank shall be regarded as one piece.
8.2.3 Each batch of steel pipes shall consist of steel pipes of the same designation, heat
number, specification and heat treatment system (heat). The quantity of each batch of
steel pipes shall not exceed the following provisions.
8.3 Sampling quantity
The sampling quantity for each inspection of each batch of steel pipes shall meet the
requirements of Table 9.
8.4 Re-inspection and determination rules
The re-inspection and determination rules of steel pipes shall comply with the
provisions of GB/T 2102.
9 Packaging, marking and quality certificate
The packaging, marking and quality certificate of the steel pipe shall comply with the
provisions of GB/T 2102.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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