GB/T 24593-2018 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 24593-2018 | English | 145 |
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Welded Austenitic Stainless Steel Tubes for Boiler and Heat Exchanger
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| GB/T 24593-2009 | English | 70 |
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Welded austenitic stainless steel tubes for boiler and heat-exchanger
| Obsolete |
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GB/T 24593-2018: Welded Austenitic Stainless Steel Tubes for Boiler and Heat Exchanger---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/GBT24593-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
H 48
Replacing GB/T 24593-2009
Welded Austenitic Stainless Steel
Tubes for Boiler and Heat Exchanger
Issued on. JUNE 07, 2018
Implemented on. MARCH 01, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Ordering Contents... 6
4 Dimension, Shape, Weight and Permissible Deviation... 7
5 Technical Requirements... 8
6 Test Method... 15
7 Inspection Rules... 16
8 Package, Mark and Quality Certificate... 16
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 24593-2009 Welded Austenitic Stainless Steel Tubes for
Boiler and Heat-Exchanger; Compared with GB/T 24593-2009, the major technical
changes are as follows.
--- Modify the length specifications (see 4.2 of this Edition; 4.2 of Edition 2009);
--- Modify the specification of out-of-roundness (see 4.4 of this Edition; 4.4 of Edition
2009);
--- Add three steel grades, namely, 015Cr21Ni26Mo5Cu2, 015Cr20Ni18Mo6CuN,
and 022Cr21Ni25Mo7N (see 5.1.1 and 5.4 of this Edition);
--- Modify the requirements for P content in the chemical composition of each grade
(see 5.1.1 of this Edition; 5.1.1 of Edition 2009);
--- Add the underwater air tightness test under the pressure test option (see 5.6.2
of this Edition).
This Standard was proposed by China Iron and Steel Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Steels (SAC/TC 183).
Drafting organizations of this Standard. Zhejiang Jiuli High-Tech Metals Co., Ltd.,
Jiangsu Wujin Stainless Steel Pipe Group Co., Ltd., Shanxi Taigang Stainless Steel
Co., Ltd., Zhejiang Dewei Stainless Steel Pipe Industry Co., Ltd., and China
Metallurgical Information and Standardization Institute.
Chief drafting staffs of this Standard. Li Jiequan, Shao Yu, Zhou Zhibin, Fu Junsheng,
Shen Gengrong, Dong Li, Ding Wenyan, Chen Liang, Wang Bowen, Mo Peiming, Liu
Mingyuan, Li Qi.
The historical edition replaced by this Standard is as follows.
--- GB/T 24593-2009.
Welded Austenitic Stainless Steel
Tubes for Boiler and Heat Exchanger
1 Scope
This Standard specifies the ordering content, dimension, shape, weight and
permissible deviation, technical requirements, test methods, inspection rules, package,
mark and quality certificate of welded austenitic stainless steel tubes for boiler and
heat exchanger.
This Standard is applicable to the welded austenitic stainless steel tubes (hereinafter
referred to as steel tubes) for the heat exchanger and medium-low-pressure boiler.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual
Titration or Potentiometric Titration Method
GB/T 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium
Thiosulfate Separation Iodimetric Method for the Determination of Copper 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 223.25 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Dimethylglyoxime Gravimetric Method for the Determination of Nickel Content
GB/T 223.28 Methods for Chemical Analysis of Iron, Steel and Alloy - The Α-
Benzoin Oxime Gravimetric Method for the Determination of Molybdenum Content
GB/T 223.36 Methods for Chemical Analysis of Iron, Steel and Alloy - The Neutral
Titration Method for the Determination of Nitrogen Content after Distillation
Separation
3 Ordering Contents
The contract and ordering list that orders steel tube as per this Standard include the
following contents.
4 Dimension, Shape, Weight and Permissible Deviation
4.1 Outer diameter and wall thickness
4.1.1 The steel tube’s outer diameter D shall not exceed 305mm; wall-thickness S
shall not exceed 8.0mm; its outer diameter and wall thickness shall conform to the
provisions of GB/T 21835.
4.2 Length
4.2.1 The general length of the steel tube is 3000mm~18000mm. Through the
negotiation between the supplier and the purchaser, and indicated in the contract, the
steel tube with other length can be supplied.
4.3 Bending
The bending of the steel tube shall be no greater than 1.5mm/m.
4.4 Out-of-roundness
For the thin steel tube with the ratio between wall thickness and outer diameter no
greater than 3%, its out-of-roundness shall not exceed 1.5% of nominal outer diameter;
the out-of-roundness of other steel tube shall not exceed the tolerance of nominal outer
diameter.
4.5 Tip shape
Both end surfaces of the steel tube shall be perpendicular to the axis of the steel tube;
the burrs of the cutting shall be removed.
4.6 Weight
The steel tube shall be delivered as per the theoretical weight. Through the negotiation
between the supplier and the purchaser, and indicated in the contract, the steel tube
can also be supplied by the actual weight; the theoretical weight per meter of the steel
tube shall be calculated as per the Formula (1).
5 Technical Requirements
5.1 Grades and Chemical Compositions of Steel
5.2 Manufacturing method
5.2.1 Smelting method of steel
The steel shall be smelted by electric arc furnace plus external refining method or
converter plus external refining method. Through the negotiation between the supplier
and the purchaser, and indicated in the contract, other smelting method can also be
taken.
5.2.2 Manufacturing method of the steel tube
5.3 Delivery state
The steel tube shall be delivered in a heat-treated and pickled passivated state.
Through the heat treatment of protective atmosphere, the steel tube shall be delivered
without pickled passivated treatment.
5.4 Mechanical properties
5.4.1 Tensile
After heat treatment, the longitudinal tensile properties of the steel tube at room
temperature shall conform to the provisions of Table 3.
5.5.4 Welded joint back bend
The steel tube shall take the welded joint back bend test. Cut a section of specimen
with length of 100mm from the steel tube, cut longitudinally at 90° from both sides of
the welded seam; flatten the specimen. The bending core diameter is 4 times of the
thickness of the specimen; when bending, the bending core shall be close to and
parallel to the outside welded seam; so that the welded seam is at the maximum
bending point with bending angle of 180°. After bending test, the specimen shall not
occur cracks or welding defects.
5.6 Density
5.6.1 Hydraulic
5.6.1.1 The steel tubes shall take the hydraulic test one by one. The test pressure
shall be calculated as per Formula (3), the maximum test pressure is 10MPa. Under
the test pressure, the pressure shall be stabilized for no less than 5s; the steel tube
shall not leak.
5.6.2 Underwater air tightness
5.6.2.1 For steel tubes with outer diameter no greater than 50.8mm, take the
underwater air tightness test against the steel tubes one by one to replace the hydraulic
test. The pressure of underwater air tightness test shall be no less than 1.0MPa; the
test medium is compressed air. Under the test pressure, the steel tube shall be
completely immersed in water; the pressure is stabilized for no less than 10s; the steel
tube shall not leak.
5.6.3 Non-destructive test
The supplier can use eddy current test to replace the hydraulic test. The artificial
defects of the comparison sample tube in the eddy current test shall conform to the
provisions of acceptance level of E4H specified in GB/T 7735-2016.
5.7 Intergranular corrosion
The steel tube shall take intergranular corrosion test. After test, the specimen shall not
occur tendency of intergranular corrosion.
5.8 Grain size
The grain size for 07Cr19Ni10, 07Cr18Ni11Nb steel tubes shall be Level-4 and Level-
7.
5.9 Surface quality
5.9.1 The inner and outer surfaces of the steel tube shall be smooth and free of
cracks, folds, twists, undercuts, incomplete penetrations and indentations of the
welded seam.
5.10 Special requirements
When the purchaser has the following special requirements, through the negotiation
between the supplier and the purchaser, and indicated in the contract.
6 Test Method
6.1 The analysis sampling for the chemical compositions of steel tube shall be
performed as per the provisions of GB/T 20066.
6.2 The dimension and shape of the steel tubes shall be measured by the measuring
tool meeting the accuracy requirements one by one.
6.3 The inner and outer surfaces of the steel tube shall be visually inspected one by
one under the adequate lighting conditions.
7 Inspection Rules
7.1 Inspection and acceptance
The inspection and acceptance of steel tube shall be carried out by the quality technical
supervision department of the supplier.
7.2 Batching rules
In addition to the chemical compositions which can be tested by the furnace, the steel
tubes shall be checked and accepted in batches. Each batch consists of the steel tubes
with the same grade, the same furnace number, the same specification, the same
welding process and the same heat treatment (furnace number); the number of each
batch of steel tube shall not exceed the following provisions.
7.3 Sampling quantities
The sampling quantities for the inspection items of the steel tube shall conform to the
provisions of Table 4.
8 Package, Mark and Quality Certificate
The package, mark, and quality certificate of the steel tube shall conform to 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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