GB/T 24593-2018 English PDF (GBT24593-2018)

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GB/T 24593-2018: Welded austenitic stainless-steel tubes for boiler and heat exchanger
GB/T 24593-2018
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
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
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 223.58 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium
Arsenite-Sodium Nitrite Titrimetric Method for the Determination of Manganese
Content
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 223.62 Methods for Chemical Analysis of Iron, Steel and Alloy - The Butyl
Acetate Extraction Photometric Method for the Determination of Phosphorus
Content
GB/T 223.84 Steel and Iron - Determination of Titanium Content -
Diantipyrylmethane Spectrophotometric Method
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 228.1 Metallic materials - Tensile testing - Part 1 . Method of test at room
temperature
GB/T 230.1 Metallic Rockwell Hardness Test—Part 1. Test Method (Scales A, B,
C, D, E, F, G, H, K, N, T))
GB/T 241 Metal Materials Tubes - Hydrostatic Pressure Test
GB/T 242 Method for Flaring Test on Tubes of Metals
GB/T 245 Metallic Materials – Tube – Flanging Test
GB/T 246 Metallic Materials – Tube – Flattening Test
GB/T 2102 Acceptance Packing Marking and Quality Certification of Steel Pipe
GB/T 2653 Methods of Bend and Compression Tests for Welded Joint
GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for
Mechanical Testing
GB/T 4334-2008 Corrosion of Metals and Alloys - Test Methods for Intergranular
Corrosion of Stainless Steels
GB/T 4340.1 Metallic Materials - Vickers Hardness Test - Part 1. Test Method
GB/T 6394 Metal - Methods for Estimating the Average Grain Size
GB/T 7735-2016 Automated Eddy Current Testing of Seamless and Welded
(Except Submerged Arc-Welded) Steel Tubes for Detection of Imperfections
GB/T 11170 Stainless Steel - Determination of Multi-Element Contents - Spark
Discharge Atomic Emission Spectrometric Method (Routine Method)
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 21835 Dimensions and Masses per Unit Length of Welded Steel Pipes
3 Ordering Contents
The contract and ordering list that orders steel tube as per this Standard include the
following contents.
a) This Standard number;
b) Product name;
c) Steel grade;
d) Dimension specification (outer diameter × wall thickness, in mm);
e) Ordering quantity;
f) Special requirements.
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. For steel tube with outer diameter less than
16mm, take the whole tube section with the specimen length of 25mm, after finishing
the corrosion immersion specified in Method E of GB/T 4334-2008, take the provisions
of 5.5.1, evaluate the specimen after flattening it; for the steel tube with outer diameter
no less than 16mm, the intergranular corrosion test method shall conform to the
provisions of Method E in GB/T 4334-2008; the welded seam is in the middle of the
specimen. Through the negotiation between the supplier and the purchaser, and
indicated in the contract, other intergranular corrosion test method can be adopted.
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. The above defects shall be removed completely; the actual wall
thickness at the removal site shall be no less than minimum allowable wall thickness;
and the removal site shall be smoothly transited. The surface of the steel tube shall
have local scratches, indentations and pits; but their depth shall not exceed 50% lower
deviation of the wall thickness; if exceeding, it is allowed to grind; the actual wall
thickness at the...