GB/T 35840.2-2018 PDF EnglishUS$315.00 · In stock · Download in 9 seconds
GB/T 35840.2-2018: Steels for plastic mould -- Part 2: Pre-hardening steel bars 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 35840.2-2018: Steels for plastic mould -- Part 2: Pre-hardening steel bars---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/GBT35840.2-2018GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.35 H 40 GB/T 35840.2-2018 Steels for plastic mould - Part 2: Pre-hardening steel bars ISSUED ON: MAY 14, 2018 IMPLEMENTED ON: FEBRUARY 01, 2019 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 ... 6 4 Ordering contents ... 7 5 Dimensions, shape, weight and allowable deviation ... 7 6 Technical requirements ... 9 7 Test methods ... 12 8 Inspection rules ... 13 9 Packaging, marking and quality certificate ... 14 Annex A (normative) Standard diagrams for macrostructure of remelted steel bars and billets ... 15 Steels for plastic mould - Part 2: Pre-hardening steel bars1 ScopeThis Part of GB/T 35840 specifies the terms and definitions, ordering contents, dimensions, shapes, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of pre-hardening steel bars for plastic mould. This Part applies to pre-hardening round steel, square steel and flat steel (hereinafter referred to as steel) delivered by hot rolling, forging and machining for the manufacture of plastic mould.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 223.3 Methods for chemical analysis of iron, steel and alloy - The diantipyryl methane phosphomolybdate gravimetric method for the determination of phosphorus content 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 223.14 Methods for chemical analysis of iron, steel and alloy - The N-benzoy- N-phenylhydroxylamine extraction photometric method for the determination of vanadium content GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - The sodium thiosulfate separation iodimetric method for the determination of copper 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 223.72 Iron, steel and alloy - Determination of sulfur content - Gravimetric method GB/T 223.76 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrometric method for the determination of vanadium content GB/T 223.82 Steel and iron - Determination of hydrogen content - Thermal conductivity/infrared method after fusion under inert gas GB/T 226 Test method for macrostructure and defect of steel by etching GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T) GB/T 908-2008 Forged bars - Dimensions, shape, weight and tolerances GB/T 1299-2014 Tool and mould steels GB/T 2101 General requirement of acceptance, packaging, marking and certification for section steel GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method) GB/T 6394 Determination of estimating the average grain size of metal GB/T 6402-2008 Steel forgings - Method for ultrasonic testing GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values GB/T 10561-2005 Steel - Determination of content of non-metallic inclusions - Micrographic method using standards diagrams GB/T 17505 Steel and steel products - General technical delivery requirements GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition3 Terms and definitionsFor the purpose of this document, the following terms and definitions apply. 3.1 pre-hardening Through heat treatment, the mould steel reaches a specific hardness state before mould manufacturing.4 Ordering contentsThe contract or order for steel products ordered in accordance with this Part shall include the following contents: a) serial number of this Part; b) product name; c) designation (see 6.1); d) smelting method (see 6.2); e) product specification dimensions, shape and allowable deviation group (see Clause 5); f) delivery status (see 6.3); g) mass (or quantity); h) special requirements;5 Dimensions, shape, weight and allowable deviation5.1 Hot-rolled steel bars 5.1.1 The dimensions, shape and allowable deviation of hot-rolled round steel and square steel shall comply with the provisions of 5.1.1 of GB/T 1299-2014. 5.1.2 The dimensions, shape and allowable deviation of hot-rolled flat steel shall comply with the provisions of 5.1.2 of GB/T 1299-2014. 5.2 Forged steel bars 5.2.1 Forged round and square steel The dimensions, shape and allowable deviation of forged round and square steel shall comply with the provisions of 5.2.1 of GB/T 1299-2014. 5.2.2 Forged flat steel 5.2.2.1 The dimensions and allowable deviation of forged flat steel with a nominal width of 40 mm ~ 300 mm shall comply with the provisions of Group 2 in Table 4 of Steel shall be checked and accepted in batches. Each batch of vacuum refined steel shall consist of steel products of the same designation, same furnace number, same delivery status, same specification and same heat treatment furnace. Each batch of electroslag steel shall consist of steel products of the same designation, same electroslag furnace number, same delivery status, same specification and same heat treatment furnace. Under the conditions that the process is stable and the requirements of this Part can be met, it shall take 1 sample from each electroslag furnace number for the chemical composition of electroslag steel. 8.3 Sampling quantity and sampling location The sampling quantity and sampling location for the inspection of steel products shall comply with the provisions of Table 6. 8.4 Re-inspection and judgment rules 8.4.1 The re-inspection and judgment rules of steel products shall comply with the provisions of GB/T 17505. 8.4.2 If the supply party can ensure that the steel products are qualified, for the macrostructure and non-metallic inclusions of steel products or billets of the same furnace number, it is allowed to replace small with large, replace product with billet, and replace macrostructure with flaw detection. 8.4.3 The various inspection and check measurement values of steel products shall be rounded off according to the rounding off value comparison method, and the rounding off rules shall comply with the provisions of GB/T 8170.9 Packaging, marking and quality certificateThe packaging, marking and quality certificate of steel products 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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