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GB/T 4354-2025 PDF EnglishUS$305.00 · In stock · Download in 9 seconds
GB/T 4354-2025: Hot-rolled quality carbon steel wire rods 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 4354: Evolution and historical versions
Excerpted PDFsFull copy of true-PDF will be delivered in 9 seconds upon purchase: GB/T 4354-2025Similar standardsGB/T 4241 GB/T 4356 GB/T 4226 GB 1499.1GB/T 4354-2025: Hot-rolled quality carbon steel wire rods---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/GBT4354-2025GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.60 CCS H 44 Replacing GB/T 4354-2008, GB/T 33165-2016 Hot-rolled quality carbon steel wire rods Issued on: MARCH 28, 2025 Implemented on: OCTOBER 01, 2025 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 8 4 Order content... 8 5 Manufacturing process... 8 6 Technical requirements... 8 7 Test methods... 11 8 Inspection rules... 12 9 Packaging, marking and quality certification... 12 Appendix A (Normative) Quantitative analysis method of centre segregation for high carbon wire rod... 13 Appendix B (Informative) Working curve setting example... 18ForewordThis document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives for standardization - Part 1.Rules for the structure and drafting of standardizing documents. This document replaces GB/T 4354-2008, Hot rolled quality carbon steel wire rods and GB/T 33165-2016, Quantitative analysis method of centre segregation for high carbon wire rod. Compared with GB/T 4354-2008 and GB/T 33165-2016, in addition to structural adjustments and editorial changes, the main technical changes are as follows. -- Change the smelting method (see 5.1; 5.2 of GB/T 4354-2008); -- Change the requirements for decarburized layer (see 6.2; 5.4 of GB/T 4354- 2008); -- Add inspection requirements for sorbite content (see 6.3.1); -- Add inspection requirements for harmful structures such as grain boundary cementite and martensite (see 6.3.2); -- Add requirements for center segregation (see 6.4); -- Add specific requirements for mechanical properties (see 6.5); -- Change the surface quality requirements (see 6.6; 5.6 of GB/T 4354-2008); -- Add requirements for the allowable deviation of size and shape (see 6.7.1); -- Change the requirements for the weight of wire rods (see 6.7.2; 4.2 of GB/T 4354-2008); -- Change the requirements for numerical rounding (see 8.4; 7.5 of GB/T 4354- 2008). Please note that some of the contents of this document may involve patents. The issuing organization of this document is not responsible for identifying patents. This document was proposed by China Iron and Steel Industry Association. This document shall be under the jurisdiction of National Technical Committee 183 on Iron and Steel of Standardization Administration of China (SAC/TC 183). Drafting organizations of this document. Maanshan Iron & Steel Company Limited, Sansteel Minguang Co., Ltd., Fujian, Rockcheck Steel Troup Co., Ltd., Hunan Valin Xiangtan Iron & Steel Co., Ltd., Henan Special Steel Materials Research Institute Co., Ltd., Jiangsu Binxin Special Steel Material Co., Ltd., Beiying Iron and Steel (Group) Co., Ltd., Tangshan Kaiping Jingzhou Steelwire Products Co., Ltd., Hebei Huaxing Hot-rolled quality carbon steel wire rods1 ScopeThis document specifies the order content, manufacturing process, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of hot-rolled quality carbon steel wire rods. This document applies to hot-rolled quality carbon steel wire rods with a nominal diameter of 5 mm ~ 52 mm (hereinafter referred to as "wire rods").2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document. 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 223.4, Alloyed steel - Determination of manganese content - Potentiometric or visual titration method GB/T 223.5, Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric 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 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 223.23, Iron, Steel and Alloy - Determination of Nickel Content - The Dimethylglyoxime Spectrophotometric Method GB/T 223.58, Methods for chemical analysis of iron, steel and alloy - The sodium arsenite-sodium nitrite titrimetric method for the determination of manganese content YB/T 4413, Metallographic determination of core segregation in high carbon steel wire rod YB/T 5293, Metallic materials - Forging test3 Terms and definitionsNo terms and definitions need to be defined in this document.4 Order contentThe contract for placing an order based on this document shall include the following. a) a reference to this document; b) product name; c) designation; d) specifications; e) weight; f) decarburized layer group; g) special requirements.5 Manufacturing process5.1 Smelting method Steel is smelted in a converter or an electric arc furnace, and can be refined outside the furnace if necessary. The smelting method is generally chosen by the supplier. Other smelting methods may also be used upon agreement between the supplier and the buyer, and shall be specified in the contract. 5.2 Delivery state Wire rods are delivered in hot rolled state.6 Technical requirements6.1 Designation and chemical composition 7.2 Chemical analysis shall be carried out in accordance with GB/T 223.3, GB/T 223.4, GB/T 223.5, GB/T 223.12, GB/T 223.19, GB/T 223.23, GB/T 223.58, GB/T 223.59, GB/T 223.60, GB/T 223.61, GB/T 223.62, GB/T 223.63, GB/T 223.64, GB/T 223.68, GB/T 223.69, GB/T 223.71, GB/T 223.72, GB/T 223.85, GB/T 223.86, or other general methods such as GB/T 4336, GB/T 20066 and GB/T 20123. Arbitration shall be carried out in accordance with GB/T 223.3, GB/T 223.4, GB/T 223.5, GB/T 223.12, GB/T 223.19, GB/T 223.23, GB/T 223.58, GB/T 223.59, GB/T 223.60, GB/T 223.61, GB/T 223.62, GB/T 223.63, GB/T 223.64, GB/T 223.68, GB/T 223.69, GB/T 223.71, GB/T 223.72, GB/T 223.85, GB/T 223.86.8 Inspection rules8.1 Inspection and acceptance The quality inspection and acceptance of wire rods shall be carried out by the supplier's technical quality supervision department. 8.2 Batch rules Wire rods shall be inspected and accepted in batches, and each batch shall consist of wire rods of the same designation, same furnace number and same specification. 8.3 Re-inspection The re-inspection and judgment rules of wire rods shall be implemented in accordance with the provisions of GB/T 2101. 8.4 Numerical rounding The numerical rounding of test results shall comply with the provisions of GB/T 8170.9 Packaging, marking and quality certificationThe packaging, marking and quality certificate of wire rods shall comply with the provisions of GB/T 2101.Appendix A(Normative) Quantitative analysis method of centre segregation for high carbon wire rod A.1 Principle of the method For hot rolled high carbon steel wire rod with carbon content greater than 0.65%, a spectrometer can be used to perform quantitative analysis of centre carbon segregation. In the low content range, the element characteristic X-ray intensity is proportional to the mass fraction. According to this principle, select a suitable set of standard samples to establish the relationship between the characteristic X-ray intensity of carbon element and its content, and obtain the working curve; then measure the carbon element line distribution on a diameter of the sample to obtain the element content of each point. Use the ratio of the maximum element content in the segregation area to the average element content on the entire line distribution to characterize the severity of centre segregation, which is the segregation ratio. A.2 Instruments and auxiliary equipment The testing laboratory shall comply with the requirements of GB/T 27025 and be provided with the following instruments and auxiliary equipment. a) Electron probe analyzer or scanning electron microscope equipped with spectrometer accessory; b) Metallographic sample preparation equipment, including sample mounting, grinding, polishing and etching equipment; c) Metallographic microscope; d) Ultrasonic cleaning device. A.3 Standard samples A.3.1 Selection of standard samples It is recommended to use carbon element standard samples that comply with GB/T 4930. The number of standard samples shall be no less than 3, and the carbon element content range of the standard samples shall cover the carbon element content of the samples. A.3.2 Processing of standard samples Before use, re-polish the standard sample and use a metallographic microscope to inspect the surface, to confirm whether there is contamination or other defects that may affect the measurement. The surface of the standard sample is not sprayed with a ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. |
