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

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

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 for the heat exchanger and medium-low-pressure boiler.
GB/T 24593-2018
GB
NATIONAL STANDARD OF THE
PEOPLE 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 ??- 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 grinding site shall be no less than minimum allowable wall thickness. Other local imperfections that don?€?t affect the minimum allowable wall thickness are allowed to exist.
5.9.2 The surplus height of welded seam of steel tube shall be removed by the method specified in 5.2.2.1.
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.
a) Add non-destructive test method (weld seam ray detection, etc.);
b) Add the stabilization heat treatment of steel tubes with grades of
06Cr17Ni12Mo2Ti, 06Cr18Ni11Ti, 06Cr18Ni11Nb, 07Cr18Ni11Nb.

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