GB/T 20892-2020 PDF EnglishUS$110.00 · In stock · Download in 9 seconds
GB/T 20892-2020: Praseodymium-neodymium metal 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 20892: Historical versions
Similar standardsGB/T 20892-2020: Praseodymium-neodymium metal---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/GBT20892-2020NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.120.99 H 65 Replacing GB/T 20892-2007 Praseodymium-neodymium metal ISSUED ON: NOVEMBER 19, 2020 IMPLEMENTED ON: OCTOBER 01, 2021 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 Technical requirements ... 5 4 Test methods ... 6 5 Inspection rules ... 7 6 Marks, packaging, transportation, storage and quality certificates ... 8 Praseodymium-neodymium metal1 ScopeThis Standard specifies the technical requirements, test methods, inspection rules, marks, packaging, transportation, storage and quality certificates of praseodymium- neodymium metal. This Standard applies to the praseodymium-neodymium metal, that uses praseodymium neodymium oxide as the raw material, is produced by the molten salt electrolysis method and is used as magnetic materials.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 8170, Rules of rounding off for numerical values & expression and judgement of limiting values GB/T 12690 (all parts), Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides GB/T 14635, Rare earth metals and their compounds - Determination of total rare earth content GB/T 17803, Designation system for rare earth products GB/T 26417, Chemical analysis methods of praseodymium-neodymium alloy and the compounds - Determination of REO relative contents3 Technical requirements3.1 Product classification The products are divided into six designations according to chemical composition: PrNd-80NdA, PrNd-80NdB, PrNd-75NdA, PrNd-75NdB, PrNd-70NdA, PrNd-70NdB. The method of product designation representation shall comply with the provisions of GB/T 17803. 3.2 Chemical composition 4.1.1 The analysis method of the total amount of rare earth (RE) is carried out according to the provisions of GB/T 14635. When the total amount of rare earths is more than 99%, the actual value of the total amount of rare earths is calculated by subtraction, namely (100%-Σ non-rare earth impurities). 4.1.2 The analytical methods of praseodymium, neodymium and rare earth impurities are carried out according to the provisions of GB/T 26417. 4.1.3 The analytical methods for non-rare earth impurities are carried out in accordance with the provisions of GB/T 12690 (all parts). 4.2 Numerical rounding The rounding of numerical values is carried out in accordance with the provisions of GB/T 8170. 4.3 Appearance quality Conduct visual inspection under natural scattered light.5 Inspection rules5.1 Inspection and acceptance 5.1.1 The product is inspected by the supplier's quality inspection department to ensure that the product quality meets the requirements of this Standard, and a quality certificate is filled out. 5.1.2 The purchaser shall inspect the received products in accordance with the provisions of this Standard. If the inspection results are inconsistent with the provisions of this Standard, it shall be submitted to the supplier within 2 months from the date of receipt of the product. The supplier and the purchaser shall negotiate and resolve. If arbitration is required, an organization recognized by both parties can be entrusted to carry out the arbitration. Sampling shall be performed jointly at the purchaser’s. 5.2 Batch Products shall be submitted for inspection in batches. Each batch shall consist of products of the same designation. 5.3 Inspection items Each batch of products shall be inspected for chemical composition and appearance quality. 5.4 Sampling and sample preparation ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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