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GB/T 37792-2019 PDF in English


GB/T 37792-2019 (GB/T37792-2019, GBT 37792-2019, GBT37792-2019)
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GB/T 37792-2019: PDF in English (GBT 37792-2019)

GB/T 37792-2019 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.99; 77.140.75 H 59 General specification for welded corrosion resistant alloy pipes and tubes ISSUED ON: AUGUST 30, 2019 IMPLEMENTED ON: JULY 01, 2020 Issued by: State Administration for Market Regulation; Standardization Administration of the PRC. Table of Contents Foreword ... 3  Introduction ... 4  1 Scope ... 5  2 Normative references ... 5  3 Dimensions, shape, weight ... 6  4 Technical requirements ... 9  5 Test methods ... 13  6 Inspection rules ... 14  7 Packing, marking, and quality certification ... 15  General specification for welded corrosion resistant alloy pipes and tubes 1 Scope This Standard specifies the dimensions, shape, weight, technical requirements, test methods, inspection rules, packing, marking, and quality certification document of welded corrosion resistant alloy pipes and tubes. This Standard applies to general requirements of welded corrosion resistant alloy pipes and tubes. 2 Normative references The following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document. GB/T 223 (all parts) Methods for chemical analysis of iron, steel and alloy GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1: Test method GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method GB/T 241 Metal materials - Tube - Hydrostatic pressure test GB/T 242 Metal materials - Tube - Drift-expanding test GB/T 246 Metal materials - Tube - Flattening test GB/T 2102 Acceptance, packing, marking and quality certification of steel pipe GB/T 2651 Tensile test method on welded joints GB/T 2653 Bend test methods on welded joints GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1: Test method GB/T 6394 Determination of estimating the average grain size of metal GB/T 7735 Automated eddy current testing of seamless and welded (except submerged arc-welded) steel tubes for detection of imperfections GB/T 8647 (all parts) The methods for chemical analysis of nickel GB/T 10561-2005 Steel - Determination of content of nonmetallic inclusions - Micrographic method using standards diagrams GB/T 11170 Stainless steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (Routine method) GB/T 15007 Designations of corrosion-resistant alloy GB/T 15260 Corrosion of metals and alloys - Test methods for intergranular corrosion of nickel alloys 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 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method GB/T 21835 Dimensions and masses per unit length of welded steel pipes NB/T 47013.2-2015 Nondestructive testing of pressure equipment - Part 2: Radiographic testing NB/T 47013.5-2015 Nondestructive testing of pressure equipment - Part 5: Penetrant testing NB/T 47013.11-2015 Nondestructive testing of pressure equipment - Part 11: Standard practice for X-ray digital radiography 3 Dimensions, shape, weight 3.1 Outer diameter and wall thickness 3.1.1 The nominal outer diameter (D) and nominal wall thickness (S) of the welded pipes and tubes shall comply with the provisions of GB/T 21835. D - The nominal outer diameter of the welded pipe and tube, in millimeters (mm). 4 Technical requirements 4.1 Designation and chemical composition 4.1.1 The designation and chemical composition of the corrosion resistant alloy shall comply with the requirements of the corresponding product standard. 4.1.2 The permissible tolerances for chemical composition of welded pipe and tube products shall comply with the provisions of GB/T 15007. 4.2 Manufacture 4.2.1 Smelting method The alloy shall be smelted by means of electric arc furnace plus external refining plus electroslag remelting, or other smelting methods which meet the requirements of this Standard. The smelting method shall be indicated in the quality certification. 4.2.2 Manufacturing method of welded pipes and tubes 4.2.2.1 The welded pipes and tubes shall be manufactured by single-sided or double-sided automatic welding method without adding or adding filler metal. 4.2.2.2 When filler metal is added during the manufacturing process of the welded pipes and tubes, a matching filler metal shall be selected, or a filler metal with a higher alloy content may be selected. 4.2.2.3 Through negotiation between the supplier and the purchaser, and indicated in the contract, welded pipes and tubes with a nominal outer diameter of not less than 508 mm allow for double longitudinal welds or circumferential weld joints of the same quality as longitudinal welds. 4.2.2.4 Two-time repair welding is not allowed at the same position of the weld of the welded pipes and tubes. The defect of the base metal does not allow for repair welding. 4.2.3 Delivery state The welded pipes and tubes shall be delivered in a heat-treated plus pickled state. The recommended heat treatment system shall be specified in the corresponding product standard or contract. Welded pipes and tubes which are overall polished, buffed, or heat treated in protective atmosphere may be not subjected to pickling. If delivered in other states, it shall be determined by D - The nominal outer diameter of the welded pipe and tube, in millimeters (mm). 4.4.2 Drift-expanding The drift-expanding test has a center taper of 60°. The drift-expanding rate of outer diameter is not less than 15%. After drift-expanding, the sample shall not have cracks or gaps. 4.4.3 Bend on welded joints 4.4.3.1 The bend sample shall be taken from the welded pipe and tube or welded test plate. The welded test plate shall be the same designation, the same heat number, the same welding process, and the same heat treatment system as the welded pipe and tube. A set of bend tests shall include a positive bend and a back bend (i.e., the outer weld and the inner weld of the welded pipe and tube are respectively at the maximum curved surface). For welded pipes and tubes with a nominal wall thickness greater than 10 mm, a set of two side bends may be adopted instead of a positive bend and a back bend. 4.4.3.2 In the bend test, the bend core diameter is 4 times the sample thickness; the bend angle is 180°. After bending, in the weld area, there shall be no cracks or gaps. 4.5 Grain size The average grain size of base metal of the welded pipes and tubes shall be determined in accordance with product standards or contract requirements. 4.6 Intergranular corrosion The intergranular corrosion test results of the welded pipes and tubes shall be judged according to product standards or contract requirements. The samples shall include the weld, the heat-affected zone, and the base metal. 4.7 Nonmetallic inclusions Nonmetallic inclusions of base metal of the welded pipes and tubes shall comply with product standards or contract requirements. 4.8 Compactness 4.8.1 Hydrostatic pressure test When the welded pipes and tubes are subjected to a hydrostatic pressure test, the test pressure is calculated according to formula (3). The maximum test pressure is 20 MPa. Under the test pressure, the pressure holding time shall be no less than 5 s. The welded pipe and tube shall not leak. the minimum wall thickness are allowed. 4.11.2 After the surface defects of the welded pipes and tubes are repaired, it shall carry out liquid penetrant inspection. The inspection results shall comply with the product standard or the contract. 5 Test methods 5.1 The inspection items and test methods of welded pipes and tubes shall comply with the requirements of Table 3. 5.2 The inner and outer surfaces of the welded pipes and tubes shall, under full lighting conditions, be visually inspected one by one. The liquid penetrant inspection shall be carried out in accordance with the provisions of NB/T 47013.5-2015. 5.3 The dimensions and shape of the welded pipes and tubes shall be measured one by one using the measuring tools which meet the accuracy requirements. For welded pipes and tubes with a nominal outer diameter of not less than 508 mm, the outer diameter shall be measured using a diameter tape measure. Table 3 -- Inspection items, sampling quantities, sampling locations, and test methods No. Inspection items Sampling quantities Sampling locations Test methods 1 Chemical composition 1/furnace GB/T 20066 GB/T 223 (all parts), GB/T 8647 (all parts), GB/T 11170, GB/T 20123, GB/T 20125 2 Tensile test 1/lot On any welded pipe and tube, GB/T 2975 GB/T 228.1 3 Tensile test on welded joints 1/lot On any welded pipe and tube, GB/T 2651 GB/T 2651 4 Delivery hardness 1/lot On any welded pipe and tube GB/T 230.1, GB/T 231.1, GB/T 4340.1 5 Flattening test 1/lot On any welded pipe and tube GB/T 246 6 Drift-expanding test 1/lot On any welded pipe and tube GB/T 242 7 Bend on welded joints TAKE one set of 2 samples per lot On different welded pipes and tubes GB/T 2653 8 Grain size 1/lot On any welded pipe and tube GB/T 6394 ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.