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GB/T 38810-2020: Seamless stainless steel pipes for liquefied natural gas Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 38810-2020: Seamless stainless steel pipes for liquefied natural gas---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/GBT38810-2020GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.75 H 48 Seamless stainless steel pipes for liquefied natural gas ISSUED ON: JUNE 02, 2020 IMPLEMENTED ON: DECEMBER 01, 2020 Issued by: State Administration for Market Regulation; Standardization Administration of the People's Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Ordering content ... 6 4 Size, shape and weight ... 6 5 Technical requirements ... 8 6 Test methods ... 13 7 Inspection rules ... 14 8 Packaging, marks and quality certificate ... 15 Seamless stainless steel pipes for liquefied natural gas1 ScopeThis Standard specifies ordering content, size, shape and weight, technical requirements, test methods, inspection rules, packaging, marks and quality certificate for seamless stainless steel pipes for liquefied natural gas. This Standard is applicable to cold rolled (drawn) austenitic stainless steel seamless steel pipes for liquefied natural gas (hereinafter referred to steel pipes).2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. 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 223.25, 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 223.40, Iron, Steel and Alloy - Determination of Niobium Content by the Sulphochlorophenol S Spectrophotometric Method GB/T 223.59, Iron, Steel and Alloy - Determination of Phosphorus Content - Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony Phosphomolybdate Blue Spectrophotometric Method GB/T 223.60, Methods for chemical analysis of iron, steel and alloy - The perchloric acid dehydration gravimetric method for the determination of Spark discharge atomic emission spectrometric method (Routine method) GB/T 17395, Dimensions, shapes, masses and tolerances of seamless steel tubes 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)3 Ordering contentThe contract or order for ordering steel pipes according to this Standard shall include but not limited to the following: a) reference to this Standard; b) product name; c) steel designation; d) dimensions (nominal outer diameter × nominal wall thickness, in mm); e) quantity ordered (total weight or total length); f) optional requirements; g) other special requirements.4 Size, shape and weight4.1 Outer diameter and wall thickness 4.1.1 The nominal outer diameter (D) and nominal wall thickness (S) of steel pipes shall meet the requirements of GB/T 17395. Required by the purchaser and agreed by the supplier and the purchaser, steel pipes of other sizes beyond those specified in GB/T 17395 can be supplied. 4.1.2 The allowable deviation of the nominal outer diameter and the nominal wall thickness of steel pipes shall meet the requirements of Table 1. 4.1.3 When the purchaser does not specify the allowable deviation level of the steel pipe size in the contract, the allowable deviation of the outer diameter and the wall thickness of steel pipes shall meet the requirements of ordinary a) The wall thickness is not more than 15mm, 1.5mm/m; b) The wall thickness is greater than 15mm, 2.0mm/m. 4.4 End shape 4.4.1 The ends of steel pipe shall be cut flat. It shall remove the incision burrs. 4.4.2 Required by the purchaser, agreed by the supplier and the purchaser and indicated in the contract, groove can be processed at both ends of steel pipe. The groove type is determined by the supplier and the purchaser through negotiation. 4.5 Out-of-roundness and unevenness of wall thickness Required by the purchaser, agreed by the supplier and the purchaser and indicated in the contract, the out-of-roundness of steel pipes shall not exceed 80% of the outer diameter tolerance. The unevenness of wall thickness of steel pipes shall not exceed 80% of the wall thickness tolerance. 4.6 Weight 4.6.1 Steel pipes are delivered according to actual weight. Required by the purchaser, agreed by the supplier and the purchaser and indicated in the contract, steel pipes can also be delivered according to theoretical weight. 4.6.2 The theoretical weight per meter of steel pipes is calculated according to formula (1): Where, W - Theoretical weight of steel pipe, in kilograms per meter (kg/m); π – 3.1416; ρ - Density of steel, in kilograms per cubic decimeter (kg/dm3), see Table 3; D - Nominal outer diameter of steel pipe, in millimeters (mm); S - Nominal wall thickness of steel pipe, in millimeters (mm).5 Technical requirements5.1 Designation and chemical composition pressure test. 5.5.4 The supplier can use eddy current testing to replace hydraulic pressure test. The artificial defects of the eddy current testing’s comparison sample tube shall meet the requirements of the acceptance level E4H or E4 in GB/T 7735- 2016. 5.6 Process performance 5.6.1 Flattening Steel pipes shall be subjected to flattening test. During the flattening test, the sample shall be pressed until the distance between the two plates is H. H is calculated according to formula (3). After flattening, there shall be no cracks or breaks on the outside of the sample bend. Where, H - Distance between two plates, in millimeters (mm); α - Deformation coefficient per unit length, taking 0.09; S - Nominal wall thickness of steel pipe, in millimeters (mm); D - Nominal outer diameter of steel pipe, in millimeters (mm). 5.6.2 Flaring Required by the purchaser, agreed by the supplier and the purchaser and indicated in the contract, steel pipes of which the outer diameter is not greater than 168.3mm and the wall thickness is not greater than 10mm may be subjected to flaring test. The top core taper of the flaring test is 60°. The flaring rate of the outer diameter is 10%. After flaring, the sample shall not have visible cracks. 5.7 Intergranular corrosion Required by the purchaser, agreed by the supplier and the purchaser and indicated in the contract, steel pipes can be tested for intergranular corrosion. The intergranular corrosion test method shall meet the requirements of method E in GB/T 4334-2020. After the test, the sample shall not have the tendency of intergranular corrosion. 5.8 Surface quality 5.8.1 There shall be no cracks, folds, folds, delamination and scars on the inner and outer surfaces of steel pipe. These defects shall be completely removed. The removal depth shall not exceed 10% of the wall thickness. The actual wall thickness where the defect is removed shall not be less than the minimum allowable wall thickness. 5.8.2 The allowable depth of the straightway on the inner and outer surfaces of steel pipe shall not be greater than 4% of the wall thickness, not greater than 0.3mm. 5.8.3 Other local defects that do not exceed the deviation of the wall thickness are allowed to exist. 5.9 Ultrasonic testing Steel pipes shall be ultrasonically tested. The artificial defects of the ultrasonic testing’s comparison sample tube shall meet the requirements of the acceptance level U3 in GB/T 5777-2019.6 Test methods6.1 The sampling for chemical composition analysis of steel pipes shall be carried out according to the rules of GB/T 20066. Chemical composition analysis is usually carried out according to GB/T 11170, GB/T 20123 or other general methods. During arbitration, it shall be conducted in accordance with GB/T 223.11, GB/T 223.25, GB/T 223.28, GB/T 223.40, GB/T 223.59, GB/T 223.60, GB/T 223.63, GB/T 223. 84, GB/T 223.85, GB/T 223.86. 6.2 The size and shape of steel pipe shall be measured one by one with a measuring tool that meets the accuracy requirements. 6.3 The inner and outer surfaces of steel pipe shall be visually inspected or endoscopically inspected one by one under sufficient lighting conditions. 6.4 The test methods and sampling methods for other inspection items of steel pipes shall meet the requirements of Table 5. Table 5 -- Inspection items, sampling quantity, sampling methods and test methods of steel pipes No. Inspection item Sampling quantity Sampling method Test method 1 Chemical composition Take 1 sample per furnace GB/T 20066 See 6.1 ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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