GB/T 32930-2016 PDF EnglishUS$150.00 · In stock · Download in 9 seconds
GB/T 32930-2016: Microcrystalline cemented carbide rod 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 32930-2016: Microcrystalline cemented carbide rod---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/GBT32930-2016NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.160 H 72 Microcrystalline cemented carbide rod ISSUED ON: AUGUST 29, 2016 IMPLEMENTED ON: JULY 01, 2017 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Requirements ... 4 4 Test methods ... 8 5 Inspection rules ... 8 6 Marks, packaging, transport, storage and quality certificate ... 9 7 Contents of contract (or order sheet) ... 10ForewordThis Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard was proposed by China Nonferrous Metals Industry Association. This Standard shall be under the jurisdiction of National Technical Committee on Non-ferrous Metal of Standardization Administration of China (SAC/TC 243). Main drafting organizations of this Standard: Xiamen Jinlu Special Alloy Co., Ltd., Xiamen Tungsten Industry Co., Ltd. (Technology Center) Main drafters of this Standard: Zhang Shouquan, Fan Zhirui, Liao Wenting, Chen Chengyi, Jiang Yuanxiang, Nie Hongbo, Zhu Guirong. Microcrystalline cemented carbide rod1 ScopeThis Standard specifies requirements, test methods, inspection rules, marks, packaging, transport, storage, contents of quality certificate and contract (or order sheet) for microcrystalline cemented carbide rod. This Standard is applicable to microcrystalline cemented carbide rod of which the average grain size of tungsten carbide (WC) is greater than or equal to 0.3 μm and less than 0.8 μm in cemented carbide.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 5242, Check rules and test methods of cemented carbide products GB/T 5243, Marking packing transport and storage of cemented carbide products3 Requirements3.1 Product classification and schematic 3.1.1 Product classification Product, according to dimensional accuracy, is classified into blank rod and finely-ground rod. 3.1.2 Product schematic See Figure 1 for product schematic. Figure 1 -- Product schematic 3.2 Chemical composition Product’s chemical composition is determined by supplier and purchaser. It is guaranteed by supplier. 3.3 Organizational structure 3.3.1 Product’s WC average grain size, porosity, non-combined carbon, macroscopic pores shall comply with the provisions of Table 1. Table 1 WC average grain size /µm Porosity Non-combined carbon Macroscopic pores ( >25μm~175μm)/(pieces/cm2) 0.3~< 0.8 ≤A02B00 C00 0 3.3.2 When purchaser has requirements for product’s other organizational structure, it shall be determined by supplier and purchaser via negotiation. 3.4 Mechanical properties 3.4.1 Product’s Rockwell hardness, bending strength shall comply with the provisions of Table 2. Table 2 Rockwell hardness (HRA) Bending resistance strength Rbm/(N/mm2) ≥91.3 ≥3600 3.4.2 When purchaser has requirements for product’s other mechanical properties, it shall be determined by supplier and purchaser via negotiation. 3.5 Dimensions and tolerances, shape tolerances 3.5.1 See Table 3 for diameter tolerances of blank rod. mm Table 3 mm 3.5.2 See Table 4 for diameter tolerances of finely-ground rod. Table 4 mm 3.5.3 See Table 5 for length tolerances of blank rod. Table 5 mm 3.5.4 See Table 6 for straightness of blank rod. Diameter D Allowable diameter tolerance of blank rod Diameter D Allowable diameter tolerance of finely-ground rod Length L Allowable length tolerance of rod Table 6 mm 3.5.5 See Table 7 for straightness of finely-ground rod. Table 7 mm 3.5.6 See Table 8 for rod’s roundness. Table 8 mm 3.6 Appearance quality 3.6.1 Defects such as peeling, bubbling, blisters, delamination, cracks, adhesives are not allowed on surface of blank rod. 3.6.2 See Table 9 for allowable lengths, widths, depths of blank rod’s circumferential chip, arris defect. Diameter D Length L Diameter D Length L Diameter of blank rod D Roundness of blank rod Diameter of finely-ground rod D Roundness of finely-ground rod Table 9 mm 3.6.3 On surface of finely-ground rod, there shall be no defects such as notch, chromatic aberration, scratch. 3.6.4 Surface roughness Ra of finely-ground rod shall not exceed 0.2 µm or be determined by supplier and purchaser via negotiation. 3.7 Other When purchaser has other requirements for product, it shall be solved by supplier and purchaser via negotiation.4 Test methods4.1 Product’s organizational structure, mechanical properties are in accordance with GB/T 5242 or determined by supplier and purchaser via negotiation. 4.2 Use measuring tools of corresponding accuracy to measure product’s dimensions and tolerances, shape tolerances. 4.3 Visually inspect product’s appearance quality. Use measuring tools of corresponding accuracy to measure.5 Inspection rules5.1 Inspection and acceptance 5.1.1 Product is inspected by supplier who shall ensure product complies with provisions of this Standard and contract (or order sheet) and fill in product’s quality certificate. 5.1.2 Purchaser shall inspect received product according to the provisions of this Standard. If inspection results fail to comply with this Standard and contract (or order sheet), it shall propose to supplier within 3 months since product is received. It shall be solved by supplier and purchaser via negotiation. When arbitration is required, sampling for arbitration shall be conducted by supplier and purchaser at purchaser’s site. Diameter of blank rod D Lengths, widths of circumferential chip, arris defect Depths of circumferential chip, arris defect 5.2 Batching Product shall be submitted for inspection in batches. Each batch of products shall be composed of products of same chemical composition, of same specification, of same category. 5.3 Inspection items and sampling Inspection items and sampling of each batch of products shall comply with the provisions of Table 10. Table 10 Inspection item Sampling quantity Sub-clause No. required Sub-clause No. of test method Organizational structure In accordance with GB/T 5242 3.3 4.1 Mechanical properties 3.4 4.1 Dimensions and tolerances, shape tolerances Piece by piece 3.5 4.2 Appearance quality Piece by piece 3.6 4.3 5.4 Determination of inspection results 5.4.1 When inspection results of product’s organizational structure, mechanical properties fail, it shall conduct double sampling to re-test rejected items. If one repeated test result still fails, this batch of products shall be determined as rejected. 5.4.2 When product’s dimensions and tolerances, shape tolerances are inspected as rejected, this piece shall be determined as rejected. 5.4.3 When product’s appearance quality is inspected as rejected, this piece shall be determined as rejected.6 Marks, packaging, transport, storage and qualitycertificate 6.1 Product’s marks, packaging, transport and storage are in accordance with the provisions of GB/T 5243. 6.2 Product quality certificate Each batch of products shall be provided with quality certificate, indicating: a) supplier’s name, address; b) product name; c) product lot number; d) product’s net weight or quantity; e) inspection results of each item and technical supervision department imprint; f) inspection date.7 Contents of contract (or order sheet)Contract (or order sheet) shall contain the following information: a) product name; b) technical requirements; c) product net weight or quantity; d) reference to this Standard; e) other. __________ END __________ ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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