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GB/T 4240-2019: Stainless Steel Wires 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 4240: Historical versions
GB/T 4240-2019: Stainless Steel Wires---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/GBT4240-2019NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.65 H 49 Replacing GB/T 4240-2009 Stainless Steel Wires Issued on. JUNE 04, 2019 Implemented on. JANUARY 01, 2020 Issued by. State Administration for Market Regulation; Standardization Administration of PRC. Table of ContentsForeword... 3 1 Scope... 5 2 Normative References... 5 3 Terms and Definitions... 7 4 Ordering Contents... 8 5 Classification, Designation and Code... 8 6 Dimension and Shape... 9 7 Technical Requirements... 10 8 Test Methods... 19 9 Inspection Rules... 19 10 Packaging, Marking and Quality Certificate... 21 Appendix A (Informative) Comparison between Designation in this Standard and Domestic & Foreign Designations... 22ForewordThis Standard was drafted as per the rules specified in GB/T 1.1-2009. This Standard replaced GB/T 4240-2009 Stainless Steel Wires. Compared with GB/T 4240-2009, this Standard has the major technical changes as follows. --- The structural category has been expanded from three categories in the original standard to four categories; add “austenite-ferrite type” (see Tables 1 and 3 of this Edition; Tables 1 and 3 of 2009 Edition); --- Tighten the allowable deviation of the steel wire size (see 6.2 of this Edition; 6.2 of 2009 Edition); --- Tighten the allowable deviation of the steel wire length (see 6.6 of this Edition; 6.6 of 2009 Edition); --- Add the chemical composition and relevant requirements for 6 designations such as O7Cr19Ni10, 06Cr18Ni11Ti, 022Cr23Ni5Mo3N, 026Cr24, 06Cr13, 14Cr17Ni2; delete the relevant requirements and the designation of 21Cr17Ni2 (see Tables 1, 3, 4, 5, 6 of this Edition; and Tables 1, 3, 4, 5, 6 of 2009 Edition); --- Supplement the mechanical properties of some designations for the soft state of steel wire (see Table 4 of this Edition; Table 4 of 2009 Edition); --- Modify the requirements for the surface condition of the steel wire (see 7.2.3 of this Edition; 7.2.3 of 2009 Edition); --- Add technical requirements and methods for intergranular corrosion test of austenitic stainless-steel wire (see 7.5.2 and Table 7 of this Edition); --- Add comparison of different designations of this Standard (see Appendix A). This Standard was proposed by China Iron and Steel Industry Association. This Standard shall be under the jurisdiction of National Technical Committee for Standardization of Steel (SAC/TC 183). Drafting organizations of this Standard. Dongbei Special Steel Group Co., Ltd.; Zhejiang Tenglong Stainless Steel Products Co., Ltd.; Jiangsu Fasten Hongsheng Stainless Steel Products Co., Ltd.; Jiangsu Shenyuan Group Co., Ltd.; Jiangsu Xinghuo Special Steel Co., Ltd.; Zhejiang Tsingshan Iron & Steel Co., Ltd.; Nantong Songcheng Industrial Co., Ltd.; and China Metallurgical Information and Standardization Institute. Chief drafting staffs of this Standard. Xie Yaping, Wen Zhengmao, Ren Cuiying, Gu Yezhong, Xu Qinhua, Zhang Guofu, Zhai Suping, Lin Ping, Wang Xiaozhu, Xu Haicheng, Zhen Juan, Xu Liang, Dong Dong, Tu Yuguo, Du Zhonggang, Zhu Xiaojie, Cheng Yan, Zong Yong, Wang Qing, Wang Baoyu, Wang Lingjun, and Len Mingjian. The historical edition replaced by this Standard is as follows. --- GB/T 4240-1984, GB/T 4042-1993, GB/T 4240-2009. Stainless Steel Wires1 ScopeThis Standard specifies the terms and definitions, ordering contents, classification and designation, dimension, shape, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of stainless-steel wires. This Standard is applicable to the stainless-steel wire (hereinafter referred to as steel wire), but excluding the stainless-steel wire for cold top forging and welding; excluding the austenitic and precipitation hardening spring stainless-steel wire.2 Normative ReferencesThe following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document. GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products GB/T 223.4 Iron, Steel and Alloy - Determination of Manganese Content - Potentiometric or Visual Titration Method GB/T 223.9 Iron, Steel and Alloy - Determination of Aluminum Content – Chrome Azurol S Photometric Method GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual Titration or Potentiometric Titration Method GB/T 223.17 Methods for Chemical Analysis of Iron, Steel and Alloy – The Diantipyrylmethane Photometric Method for the Determination of Titanium Content GB/T 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy – The Sodium Thiosulfate Separation Iodimetric Method for the Determination of Cupper Content GB/T 223.23 Iron, Steel and Alloy - Determination of Nickel Content - The Dimethylglyoxime Spectrophotometric 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 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content - The Thiocyanate Spectrophotometric Method GB/T 223.28 Methods for Chemical Analysis of Iron, Steel and Alloy – The α- Benzoinoxime Gravimetric Method for the Determination of Molybdenum Content GB/T 223.36 Methods for Chemical Analysis of Iron, Steel and Alloy – The Neutral Titration Method for the Determination of Nitrogen Content after Distillation Separation GB/T 223.37 Methods for Chemical Analysis of Iron, Steel and Alloy - the Indophenol Blue Photometric Method for the Determination of Nitrogen Content after Distillation Separation GB/T 223.40 Methods for Chemical Analysis of Iron, Steel and Alloy - The Anion- Exchange Separation - Sulphochlorophenol S Photometric Method for the Determination of Niobium Content 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 Silicon Content GB/T 223.61 Methods for Chemical Analysis of Iron, Steel and Alloy - The Ammonium Phosphomolybdate Volumetric Method for the Determination of Phosphorus Content GB/T 223.64 Iron, Steel and Alloy - Determination of Manganese Content - Flame Atomic Absorption Spectrometric Method GB/T 223.72 Iron, Steel and Alloy - Determination of Sulfur Content - Gravimetric Method GB/T 223.86 Iron, Steel and Alloy - Determination of Total Carbon Content - Infrared Absorption Method after Combustion in an Induction Furnace GB/T 228.1 Metallic Materials - Tensile Testing - Part 1.Method of Test at Room Temperature3 Terms and DefinitionsFor the purposes of this document, the following terms and definitions apply. 3.1 Delivery status 3.1.1 Soft The steel wire is subjected to bright heat-treatment, or pickled or taken similar treatment after heat treatment to remove the surface oxide scale. 3.1.2 Lightly drawn After heat treatment, the steel wire is drawn to the finished product dimension with a small area reduction ratio. 3.2 Surface status 3.2.1 Gray After the dry drawing and heat treatment, the surface of the steel wire is dull. 3.2.2 Bright After wet drawing and heat treatment, the surface of the steel wire is bright. 3.2.3 Cleanliness After the drawing and heat treatment, the surface of the steel wire is clean. 3.2.4 Coating The surface of the steel wire is coated or plated.4 Ordering ContentsThe contract and ordering list for ordering shall include the following contents. a) This Standard number; b) The name of the product; c) Designation;5 Classification, Designation and CodeThe steel wires are divided into 4 categories according to the structure; its category, designation, delivery status and code can refer to Table 1.6 Dimension and Shape6.1 The nominal size range of the soft steel wire is 0.05mm~16.0mm; the nominal size range of the lightly drawn steel wire is 0.30mm~16.0mm; while the nominal size range of the cold drawn steel wire is 0.10mm~12.0mm. 6.2 The allowable deviation of the steel wire size shall conform to the provisions of Level-11 in Table 2 of GB/T 342-2017. 6.3 The out-of-roundness of the round steel wire shall be no greater than half of the diameter tolerance. 6.4 The steel wires shall be delivered in coils, spools, tightly wound layers with or without mandrels, and container package. The coil and densely packed layer winding shall be regular; when unpacked the coils, the steel wires shall not be scattered, twisted, tangled or knotted, etc. 6.5 The inner diameter of the steel wire shall conform to the provisions of Table 2. When the purchaser has special requirements for the diameter of the coil, it shall be determined through the negotiation between the purchaser and the supplier. 6.6 The length and allowable deviation of the straight steel wires shall conform to the provisions of Level-II in Table 6 of GB/T 342-2017.7 Technical Requirements7.1 Raw materials and chemical composition 7.1.1 The steel designation and chemical composition (smelting analysis) of steel wires shall conform to the provisions of Table 3.According to the negotiation between the supplier and the purchaser, and indicated in the contract, the chemical composition may be adjusted properly; 7.1.2 The allowable deviation of the chemical composition of the steel wire shall conform to the provisions of GB/T 222. 7.1.3 Other technical requirements for the wire rod of steel wire shall conform to the provisions of GB/T 4356. 7.2 Delivery status 7.2.1 The steel wire shall be delivered in the condition specified in Table 1. 7.2.2 According to the requirements of the purchaser, the straight or polished steel wire can be provided. 7.3 Mechanical properties 7.3.1 The mechanical properties of the soft steel wire shall conform to the provisions of Table 4. 7.3.2 The mechanical properties of the lightly drawn steel wire shall conform to the provisions of Table 5. 7.3.3 The mechanical properties of the cold drawn steel wire shall conform to the provisions of Table 6. 7.3.4 The mechanical properties of the straight or polished steel wires are allowed to have a deviation of ±10%. 7.4 Surface quality The surface of the steel wire shall be free of scars, folds, cracks, burns, pits, scratches, scales that are harmful to use; but pits and scratches with an individual depth not exceeding half of the dimensional tolerance are allowed to exist. The surface of the straight steel wire allows spiral threads and lubricant residues. The oxide film is allowed on the surface of the martensitic steel wire delivered in the soft state. 7.5 Special requirements 7.5.1 According to the requirements of the purchaser, through the negotiation between the supplier and the purchaser, the steel wires with other mechanical properties can be provided. 7.5.2 According to the requirements of the purchaser, the austenitic stainless-steel wire with a nominal size greater than 1.0mm can perform the intergranular corrosion test. The test method shall be negotiated between the supplier and the purchaser, and indicated in the contract.8 Test MethodsThe inspection items and test methods of steel wire shall conform to the provisions of Table 7.9 Inspection Rules9.1 Inspection and acceptance 9.1.1 The exit-factory inspection and acceptance of the steel wire shall be carried out by the supplier’s quality department. 9.1.2 The inspection and acceptance of the steel wire shall be performed as per the Designation Nominal diameter / mm Tensile strength Rm/ MPa provisions of GB/T 2103-2008. 9.2 Batching rules The steel wires shall be inspected and accepted in batches. Each batch consists of the steel wires with the same designation, the same furnace number, the same size, and the same delivery status. 9.3 Sampling quantity and sampling position The sampling quantity and sampling position of the steel wires shall conform to the provisions of Table 7.10 Packaging, Marking and Quality CertificateThe steel wires are generally packed according to the Type-C or Type-E in GB/T 2013- 2008; If other package types are required, it shall be indicated in the contract. The marking and quality certificate shall meet the requirements of GB/T 2103-2008. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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