GB/T 24593-2018 PDF EnglishUS$145.00 · In stock · Download in 9 seconds
GB/T 24593-2018: Welded Austenitic Stainless Steel Tubes for Boiler and Heat Exchanger Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 24593: Historical versions
Similar standardsGB/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/GBT24593-2018GB 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 ContentsForeword... 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... 16ForewordThis 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 Exchanger1 ScopeThis 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 ReferencesThe 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 Separation3 Ordering ContentsThe contract and ordering list that orders steel tube as per this Standard include the following contents.4 Dimension, Shape, Weight and Permissible Deviation4.1 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 Requirements5.1 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 Method6.1 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 Rules7.1 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 CertificateThe 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. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 24593-2018 be delivered?Answer: The full copy PDF of English version of GB/T 24593-2018 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 24593-2018_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 24593-2018_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 24593-2018 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.Question 5: Should I purchase the latest version GB/T 24593-2018?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 24593-2018 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.How to buy and download a true PDF of English version of GB/T 24593-2018?A step-by-step guide to download PDF of GB/T 24593-2018_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB/T 24593-2018". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
