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GB 6479-2013: [GB/T 6479-2013] Seamless steel tubes for high-pressure chemical fertilizer equipment 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 6479: Historical versions
GB 6479-2013: [GB/T 6479-2013] Seamless steel tubes for high-pressure chemical fertilizer equipment---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/GB6479-2013 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.75 H 48 Replacing GB 6479-2000 Seamless Steel Tubes for High-Pressure Chemical Fertilizer Equipments Issued on. SEPTEMBER 18, 2013 Implemented on. JULY 1, 2014 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative References... 5 3 Order... 8 4 Dimension, Shape and Weight... 9 5 Technical Requirements... 11 6 Test Methods... 19 7 Inspection Rules... 20 8 Packaging, Marking and Quality Certificate... 21ForewordIn this Standard, 4.4, 4.6, 5.1, 5.2, 5.3, 5.4.1, 5.4.2, 5.4.4, 5.4.5, 5.5, 5.6.1, 5.7, 5.8.1, 5.9, 5.10.1, clauses 6~8 are mandatory; the rest are recommendatory. This Standard is drafted according to the requirements of GB/T 1.1-2009. This Standard replaces GB 6479-2000 Seamless Steel Tubes for High-Pressure Chemical Fertilizer Equipments. Compared with GB 6479-2000, besides editorial changes, this Standard has the main technical changes as follows. — Normative references are adjusted and added; — Order contents are added; — Allowable deviation of outer-diameter and wall-thickness of steel tube is modified; — Allowable length deviation is modified; — The requirement of flexibility along the full length is added; — The requirements of out-of-roundness and wall unevenness are added; — Designation and chemical composition are modified; — Manufacturing methods are modified; — Mechanical properties are modified; — The requirements of flattening test are modified; — Nonmetallic inclusion test requirements are modified; — Non-destructive inspection requirements are modified. This Standard was proposed by China Iron and Steel Association. This Standard shall be under the jurisdiction of the National Technical Committee on Iron and Steel of Standardization Administration of China (SAC/TC 183). Drafting organizations of this Standard. Angang Steel Company Limited, Ansteel Chengdu Steel-Vanadium Co., Ltd., Hunan Hualing steel pipe Holding Co., Ltd., Zhejiang University of Technology Chemical Equipment Co., Ltd., Hengyang Valin Steel Tube Co. Ltd. AND Jiangsu Valin-Xigang Special Steel Co., Ltd. Chief drafting staffs of this Standard. Guo Xiuli, Piao Zhimin, Li Qi, Li Yanghua, He Zhengyan, Di Liping, Chen Zhongyou, Zhao Bin, Chen Shaolin and Li Yingxiong. The previous editions replaced by this Standard are as follows. — GB6479-1986 and GB6479-2000. Seamless Steel Tubes for High-Pressure Chemical Fertilizer Equipments1 ScopeThis Standard specifies seamless steel tubes for high-pressure for chemical fertilizer equipment in terms of dimension, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate, etc. This Standard is applicable to seamless steel tube for high-pressure chemical fertilizers equipment and pipeline or the ones for other chemical equipment.2 Normative ReferencesThe following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated reference, the latest edition of the normative document (including any amendments) applies. GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products GB/T 223.3 Methods for Chemical Analysis of Iron, Steel and Alloy - The Diantipyrylmethane Phosphomolybdate Gravimetric Method for the Determination of Phosphorus Content GB/T 223.5 Steel and Iron - Determination of Acid-soluble Silicon and Total Silicon Content - Reduced Molybdosilicate Spectrophotometric Method GB/T 223.11 Iron Steel and Alloy - Determination of Chromium Content - Visual Titration or Potentiometric Titration 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 Content3 OrderFor the purpose of this Standard, the order contract or order form shall include the following information.4 Dimension, Shape and Weight4.1 Outer-diameter and wall-thickness 4.1.1 The nominal outer-diameter (D) and nominal wall-thickness (S) of steel tubes shall meet those specified in GB/T 17395. 4.2 Allowable deviation of outer-diameter and wall-thickness 4.2.1 Allowable deviation of outer-diameter and wall-thickness of hot rolled (squeezed and extended) steel tubes shall be in accordance with those specified in Table 1. 4.2.2 Allowable deviation of outer-diameter and wall-thickness of cold-drawn (rolled) steel tube shall meet those specified in Table 2. 4.3 Length 4.3.1 General length General length of steel tubes is 4000mm ~12000 mm. Based on the agreement of both Seller and Buyer, the steel tubes longer than 12000mm and the ones with length between 3000mm and 4000mm may be delivered if indicated in the contract; the quantity shall not exceed 5% of the total quantity delivered at this batch. 4.3.2 Specified length and multiple length 4.4 Curvature 4.4.1 Curvature per meter of steel tubes shall meet those specified in Table 3. 4.5 Out-of-roundness and wall unevenness As required by the Buyer, based on the agreement of both Seller and Buyer and also indicated in the contract, the out-of-roundness and wall unevenness of steel tubes shall not exceed 80% of the tolerance of outer-diameter and wall-thickness respectively. 4.6 End shape The surface of both ends of steel tube shall be vertical to the axis and the cutting burrs shall be cleared away. 4.7 Delivery weight5 Technical Requirements5.1 Designation and chemical composition 5.1.1 Designation and chemical composition (melting analysis) of steel shall be in accordance with those specified in Table 4.The steel tubes are accepted based on the smelting composition. 5.1.3 If the steel is smelted in oxygen converter, the nitrogen content shall not be greater than 0.008 % except 12Cr5Mo. 5.1.4 Carbon equivalent (CEV) of Q345B, Q345C, Q345D and Q345E shall not be greater than 0.45 %. The carbon equivalent shall be analyzed for its composition by melting and calculated by Equation (1). CEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15... (1) 5.2 Manufacturing method 5.2.1 Manufacturing method of steel The steel shall be treated by electric arc furnace and external refining with vacuum refining or oxygen converter and external refining with vacuum refining or smelted by electroslag remelting process. 5.2.2 Manufacturing method of tube blank The tube blank may be manufactured by continuous casting, die casting or heat rolling (forging). 5.2.3 Manufacturing method of steel tubes The steel tube shall be made with hot rolled (squeezed and extended) or cold-drawn (rolled) seamless methods. The method designated by the Buyer shall be indicated in the contract. 5.3 Delivery state The steel tubes shall be delivered in heat treatment state. The heat treating system shall be in accordance with those specified in Table 6 and shall be filled in the quality certificate. 5.4.2 The impact absorbed energy in Table 7 is the required value of Charpy V-notch of specimen of standard dimension. Where the small-dimension impact specimen is adopted, the required value for impact absorbed energy of Charpy V-notch shall be the required impact absorbed energy of specimen of standard dimension multiplied by the decline factor in Table 8. 5.4.4 The steel tubes with outer-diameter of less than 219 mm shall be sampled longitudinally along the steel tubes in the tensile test. 5.5 Hydraulic test 5.5.1 The steel tube shall be subjected to the hydraulic test one by one; the test pressure shall be calculated according to Equation (2). The maximum test pressure is 20MPa; pressure stabilization time is not less than 10s. Under the test pressure, the steel tube shall be without leakage. 5.6 Processing properties 5.6.1 Flattening test 5.6.1.1 Steel tubes, except 12Cr5Mo steel tube, shall be subjected to flattening test if outer-diameter is between 22mm ~ 600mm and S/D ≤ 0.15. 5.8 Nonmetallic inclusion test 5.8.1 Steel tubes directly rolled with continuously cast round billet or steel ingot shall be subjected to nonmetallic inclusion test which may be rated according to Method A in GB/T 10561-2005; for class A, class B, class C, class D inclusions, both fine and thick level shall not be higher than 2.5; DS inclusion shall not be higher than Grade 2.5; the total fine and thick level for class A, class B, class C, class D inclusions shall not be higher than 6.5 respectively. 5.9 Surface quality 5.9.1 There shall not be crack, wrinkles, creasing, delamination or scabs on internal and external surfaces of steel tube. All these defects shall be cleared away and clean-up depth shall not exceed negative deviation of nominal wall-thickness. The actual wall-thickness on the cleaning places shall not be less than the permissible minimum value of wall-thickness. 5.10 Nondestructive examination 5.10.1 Steel tube shall be subjected to ultrasonic inspection examination one by one according to GB/T 5777-2008.The longitudinal slot depth of contrast tubes follows L2 for cold-drawn (rolled) steel tubes or L2.5 for hot-rolled (squeeze and extended) ones.6 Test Methods6.1 The dimension and shape of steel tube shall be measured by the measuring tool in conformity with accuracy requirement. 6.2 Internal and external surfaces of steel tube shall be subjected to visible examination in the abundant illuminating condition.7 Inspection Rules7.1 Inspection and acceptance The inspection and acceptance for steel tube shall be carried out by the quality and technical supervision department of the Seller. 7.2 Batching rules Steel tubes shall be inspected and accepted based on the smelting furnace for chemical composition, macroscopic examination and nonmetallic inclusion test; the rest inspection items shall be inspected and accepted according to batches. 7.3 Sampling quantity Sampling quantity of each batch of steel tubes shall be selected according to those specified in Table 11 for each examination.8 Packaging, Marking and Quality CertificateThe packaging, marking and quality certificate of steel tubes shall meet those specified in 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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