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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: Historical versions
GB/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... 181 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 content3 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.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. 5.2 Delivery state Wire rods are delivered in hot rolled state.6 Technical requirements6.1 Designation and chemical composition 6.1.1 The steel designation and chemical composition (melting analysis) shall comply with the requirements of GB/T 699. 6.2 Decarburized layer Wire rods of 30 steel and above shall be inspected for the depth of decarburized layer, and the total decarburized layer (ferrite + transition layer) depth on one side of the wire rod shall comply with the requirements of Table 1.If not specified, Group II shall apply. 6.3 Micro structure 6.3.1 The metallographic structure of wire rods of 65 steel and above is mainly sorbite structure. The sorbite content shall comply with the requirements of Table 2.Special requirements may be stated in the contract. 6.3.2 Wire rods of 65 steel and above are required to be tested for grain boundary cementite and central martensite and shall comply with the requirements of Table 3. 6.4 Center segregation 6.4.1 Based on the requirements of the buyer and upon agreement between the supplier and the buyer, wire rods of 60 steel and above may be subjected to the central carbon segregation test. There shall be no central carbon segregation of grade 3 or above. 6.5 Mechanical properties Wire rods shall be tested for tensile properties and provided with tensile strength and area reduction results. Specific requirements for mechanical properties can also be specified through consultation between the supplier and the buyer. Table 4 shows the reference range of mechanical properties of typical designations. 6.7 Size, shape, weight 6.7.1 The size, shape and allowable deviation of the wire rod shall comply with the requirements of Grade B accuracy in GB/T 14981-2009. 6.8 Special requirements. Based on the requirements of the buyer and upon agreement between the supplier and the buyer, bending test, forging test, torsion test and inspections of grain size, non- metallic inclusions, metallographic structure, etc. can be carried out. The indicators shall be stipulated by the agreement between the supplier and the buyer and shall be indicated in the contract.7 Test methods7.1 The sampling quantity, sampling method and test method of each batch of wire rod inspection items shall comply with the requirements of Table 5. 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 20123.8 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.9 Packaging, marking and quality certificationThe packaging, marking and quality certificate of wire rods shall comply with the provisions of GB/T 2101. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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