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GB/T 1222-2016: Spring steels 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 1222: Historical versions
GB/T 1222-2016: Spring steels---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/GBT1222-2016GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.25 H 40 Replacing GB/T 1222-2007 Spring steels Issued on. DECEMBER 13, 2016 Implemented on. SEPTEMBER 01, 2017 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 Introduction... 5 1 Scope... 6 2 Normative references... 6 3 Terms and definitions... 9 4 Order contents... 9 5 Dimension, shape and weight... 10 6 Technical requirements... 10 7 Test methods... 19 8 Inspection rules... 20 9 Packaging, marking and quality certificate... 21 Annex A (normative) Cross-section shape, nominal dimension and shape of hot-rolled flat steels... 22 Annex B (informative) Main features and usage of each steel grade... 29 Annex C (informative) Comparison table of steel grades in this Standard and steel grades in national and international standards... 31 Annex D (informative) Main technical parameters of 28SiMnB and 40SiMnVBE steels... 33 Annex E (informative) End hardenability band of some steel grades... 38 Bibliography... 401 ScopeThe Standard specifies the terms and definitions, order contents, dimension, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of hot-rolled, forged and cold-drawn spring steels. The Standard is applicable to spring round steels and spring square steels with a nominal diameter or a side length of not more than 120 mm (hereinafter referred to as bars), spring flat steels with a nominal width of not more than 160 mm and a nominal thickness of not more than 60 mm, spring steel wire rods with a nominal diameter of not more than 40 mm. The grades and chemical composition specified in this Standard are also applicable to steel ingots, billets and their products.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 222 Permissible tolerances for chemical composition of steel products GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content-reduced molybdosilicate spectrophotometric method GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method GB/T 223.13 Methods for chemical analysis of iron, steel and alloy - The ammonium ferrous sulfate titration method for the determination of vanadium content GB/T 223.19 Method 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 223.26 Iron steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method GB/T 223.43 Iron, steel and alloy - Determination of tungsten content - Gravimetric method and spectrophotometric method3 Terms and definitionsFor the purpose of this document, the following terms and definitions and those specified in GB/T 3207 apply. 3.1 spring steels Steel with elastic property and is used for manufacturing springs and elastic components.4 Order contentsThe order contract or order based on this Standard shall include following contents. a) Standard number; b) Product name; c) Steel grade or unified digital code; d) Delivery mass (quantity); e) Dimension and accuracy (see Clause 5); f) Delivery condition or code (see 6.3);5 Dimension, shape and weight5.1 The dimension, shape, weight and tolerance of the hot-rolled bars shall comply with the relevant specifications of GB/T 702.The specific requirements shall be indicated in the order contract. 5.2 The dimension, shape, weight and tolerance of forged bars shall comply with the relevant specifications of GB/T 908.The specific requirements shall be indicated in the order contract. 5.3 The dimension and tolerance of the hot-rolled wire rods shall comply with the relevant specifications of GB/T 14981.The specific requirements shall be indicated in the order contract. 5.6 The dimension, shape, weight and tolerance of bright steels shall comply with the relevant specifications in GB/T 3207.The specific requirements shall be indicated in the order contract. 5.7 The steel is delivered based on actual weight.6 Technical requirements6.1 Grade and chemical composition 6.2 Smelting method Unless otherwise specified in the contract, the smelting method is chosen by the manufacturing plant. 6.3 Delivery condition The steel may be delivered according the to the pressure processing method, heat treatment method, and surface roughness listed in Table 1.The specific delivery condition shall be indicated in the contract. For example. hot-rolled stress-relief-annealed spring steel (code. WHR+A); hot-rolled softening- annealed spring steel with level 1 surface roughness (code. WHR+SA+FB). 6.4 Mechanical property 6.4.1 The hardness of steels’ delivery condition shall comply with the specifications of Table 3.If the supply party can assure that the steels are 6.4.4 The mechanical properties of wire rods are not inspected. If the demand party requires inspection of the mechanical properties, the specific indicators are agreed upon between the supplier and demand parties. 6.5 End hardenability 6.5.1 55SiMnVB and 28SiMnB steel shall be subjected to the end hardenability test. The minimum Rockwell hardness value at 9 mm from the quenching end shall comply with the specification of Table 5.If the supply party can assure that 6.5.2 As required by the demand party and indicated in the contract, the end hardenability of other spring steels (excluding 55SiMnVB and 28SiMnB) may also be determined by the end hardenability test method or the DI value calculation method specified in Annex A of GB/T 5216-2014.The ordering method of hardenability band shall be implemented according to 6.6 of GB/T 5216-2014, and the specific requirement shall be indicated in the contract. 6.5.3 The hardenability band of some steel grades and the hardness value of each point refer to Annex E. 6.6 Low power 6.7 Nonmetallic inclusions The nonmetallic inclusion inspection shall be done for steels, and the result shall comply with the specifications of Table 7.The specific group shall be indicated in the contract; if not indicated, it is delivered as Group 2. 6.8 Decarburization layer 6.8.1 For the total decarburization layer (full decarburization layer + partly decarburization layer) depth of steels, each side shall comply with the specifications of Table 8 (the decarburization layer of flat steels is inspected on the broad side). 6.8.2 There shall not be decarburization layer on the surface of bright steels. 6.9 Surface quality 6.9.1 The surface of hot-rolled or forged bars or hot-rolled flat steels shall not 6.9.3 The surface of cold-drawn round steels shall comply with the specifications of GB/T 3078. 6.10 Special requirements As required by the demand party, agreed upon between the supply and demand parties and indicated in the contract, it may also supply the steel products with the following special requirements.7 Test methods7.1 The test items and test methods for steel products shall comply with the specification of Table 10. 7.2 The chemical composition (excluding oxygen content) of steel shall be analyzed according to GB/T 223.5,8 Inspection rules8.1 Checking and acceptance 8.2 Batching rules The steel products shall be checked and accepted in batches. Each batch consists of steel products of the same steel grade, the same furnace number, the same dimension, the same delivery condition, and the same heat treatment furnace (or system). 8.3 Sampling quantity and sampling positions The sampling quantity and sampling positions of each batch of steel products shall comply with the specifications of Table 10. 8.4 Re-inspection and determination rules 8.4.1 The re-inspection and determination rules shall refer to the specifications of GB/T 17505. 8.4.3 The test and inspection result shall adopt the rounding off value comparison method to make it the same digital number as that of the specified value. The rounding off rules shall comply with the specifications of Clause 3 in GB/T 8170-2008.9 Packaging, marking and quality certificate9.1 The packaging, marking and quality certificate of steel products shall comply with the relevant specifications of GB/T 2101. 9.2 Agreed upon between the supply and demand parties and indicated in the contract, it may also use other special packaging, marking and protection measures. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 1222-2016 be delivered?Answer: The full copy PDF of English version of GB/T 1222-2016 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 1222-2016_English with my colleagues?Answer: Yes. 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