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GB/T 40029-2021: Steel strand for prestressed concrete of LNG 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 40029-2021: Steel strand for prestressed concrete of LNG---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/GBT40029-2021GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.65 CCS H 49 Steel strand for prestressed concrete of LNG ISSUED ON: APRIL 30, 2021 IMPLEMENTED ON: NOVEMBER 01, 2021 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 Terms and definitions ... 4 4 Symbols ... 5 5 Codes and marks ... 6 6 Order content ... 6 7 Technical requirements ... 6 8 Test methods ... 11 9 Inspection rules ... 14 10 Packaging, labeling, transportation, storage and quality certificate ... 15 Bibliography ... 17 Steel strand for prestressed concrete of LNG1 ScopeThis Standard specifies the terms and definitions, symbols, codes and marks, order content, technical requirements, test methods, inspection rules, packaging, labeling, transportation, storage and quality certificates for steel strand for prestressed concrete of LNG (hereinafter referred to as "steel strand"). This Standard is applicable to the steel strand used in prestressed concrete structure of liquefied natural gas storage tank engineering, and other low temperature environments.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 228.1, Metallic materials - Tensile testing - Part 1: Method of test at room temperature GB/T 5224, Steel strand for prestressed concrete GB/T 14370, Anchorage, grip and coupler for prestressing tendons GB/T 21839, Test methods of steel for prestressing concrete YB/T 081, Rule for Rounding Off of Numerical Values and Judgement of Testing Values for Technical Standards of Metallurgy3 Terms and definitionsFor the purposes of this document, the terms and definitions defined in GB/T 5224 as well as the followings apply. 3.1 cold drawn round wire smooth round steel wire formed by cold drawing of wire rod 3.2 strand5 Codes and marks5.1 Codes For the strand that is twisted by six cold drawn round wires, around a cold drawn round wire, according to the same twist direction, the same twist distance, its structure code is: 1×7. 5.2 Marks Products are marked with product name, structure code, nominal diameter, strength level, and file number. Example: The steel strand of which the nominal diameter is 15.70mm, tensile strength is 1860MPa, is marked as: prestressed steel strand 1×7-15.70-1860-GB/T 40029- 20216 Order contentThe contract for ordering according to this Standard shall contain the following main contents: a) Number of this Standard; b) Product name; c) Intensity level; d) Structure code; e) Steel strand size, length and weight (or quantity, or coil weight); f) Twist direction; g) Purpose; h) Other requirements.7 Technical requirements7.1 Shape, size, weight and allowable deviation The size and allowable deviation of the steel strand shall meet the requirements furnace batch numbers at the most. 7.2.4 The lay length of the steel strand shall be 12 to 16 times the nominal diameter of the steel strand. 7.2.5 The diameter of the center wire shall not be less than 1.03 times the diameter of the outer wire. 7.2.6 There shall be no broken, cross-cracked and intersecting steel wires in the steel strand. 7.2.7 The twist direction of the steel strand is right twist or left twist. 7.2.8 The steel strand shall be cut with a grinding wheel saw. It shall not be loose after cutting. If it leaves the original position, it shall be manually restored to the original position. 7.2.9 There shall be no welding points on the steel strand, including the welding points before drawing. 7.3 Properties 7.3.1 The mechanical properties of steel strand shall meet the requirements of Table 3. Table 3 -- Mechanical properties of steel strand Strand structure Nominal diameter Dn/mm Tensile strength Rm/MPa Whole steel strand Maximum force Fm/kN Maximum value of the maximum force of steel strand Fmꞏmax/kN 0.2% yield strength Fp0.2/kN Maximum force total elongation Agt/% (L0≥500mm) 1×7 15.20 1860 260 288 229 5.0 1×7 15.70 1860 279 309 246 5.0 1×7 17.80 1860 355 391 313 5.0 7.3.2 The steel strand is drawn and fractured. The steel wire fracture shall be plastic fracture. 7.3.3 The rate of reduction in area Z of the central steel wire of the strand is not less than 25%. 7.3.4 The elastic modulus E of the steel strand is (195±10) GPa, which cannot be used as a delivery condition. When requested by the purchaser, the range value shall be met. 8.3.2 0.2% yield strength The 0.2% yield strength test of the steel strand is carried out in accordance with the provisions of GB/T 21839. The 0.2% yield force is the force (Fp0.2) when the non-proportional extension of the extensometer gauge length (not less than 500mm) reaches 0.2% of the extensometer gauge length. When measuring Fp0.2, the preload is 10% of the nominal maximum force. 8.3.3 Maximum force total elongation The determination of the maximum force total elongation Agt is carried out in accordance with the provisions of GB/T 21839. If it uses a computer to collect data or use electronic stretching equipment, the extension of the specimen caused by the preload when measuring the elongation shall be added to the total extension. 8.3.4 Elastic modulus The determination of elastic modulus is carried out according to GB/T 21839. 8.3.5 Steel wire section shrinkage rate The rate of reduction in area of steel wire shall be determined in accordance with the provisions of GB/T 228.1. After the wire is broken, the diameter of the wire is measured in two mutually perpendicular directions at the smallest point of the necking (if necessary, the broken part of the specimen shall be butted together at the break). Take the average value d1. The rate of reduction in area of steel wire is calculated according to formula (2): Where, Z - Rate of reduction in area, %; d1 - Average diameter after breaking, in millimeters (mm); d0 - Original average diameter, in millimeters (mm). 8.4 Stress relaxation performance test 8.4.1 The stress relaxation performance test of steel strand shall be carried out according to GB/T 21839. 8.4.2 The test gauge length is not less than 60 times of the nominal diameter. 8.4.3 No heat treatment or cold working shall be carried out after specimen 10.1.3 Each coil of steel strands shall be bundled firmly, not less than 6 bundles. After mutual agreement, moisture-proof paper, linen cloth and other materials can be added for packaging. 10.2 Labeling Each steel strand coil shall be attached with a sign, indicating supplier name, product name, mark, exit-factory number, specification, strength level, furnace batch number, execution document number, weight and number of pieces. 10.3 Transportation The steel strand shall be transported in a closed type. Pay attention to waterproof. Avoid contact with all objects that may cause mechanical or chemical damage to the steel strand. Be careful when loading and unloading to prevent damage to the steel strand and its packaging. 10.4 Storage 10.4.1 Steel strands shall be stored indoors. Set up support pads to prevent the steel strand from contacting the ground. 10.4.2 Pay attention to ventilation during storage of steel strands and prevent atmospheric corrosion to the steel strands. 10.4.3 During storage, all steel strands shall be protected with water-soluble anti-rust oil or similar products every 10d~12d if they are unpacked. 10.5 Quality certificate Each batch shall be accompanied by a quality certificate, indicating the supplier's name, product name, specification, mark, strength level, implementation standard, weight, number of pieces, purchaser’s name, test results, delivery date, and quality inspection department's imprint. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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