GB/T 2968-2020Samarium metal (English PDF)
金属钐
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
November 19, 2020
Implementation date
October 1, 2021
Scope
GB/T 2968-2020 is the English-translated version of 金属钐.
Samarium metal is the subject of GB/T 2968-2020, a Chinese national product standard. It fixes the technical requirements, test methods, inspection rules, marking, packaging, transport, storage and quality certificate for samarium made by metallothermic reduction and used mainly in rare earth permanent magnet materials and as a metal additive.
Five designations are set by chemical composition, Sm-4N, Sm-3N5, Sm-3N, Sm-2N5 and Sm-2N, written in the form required by GB/T 17803.
The samarium content is obtained by subtraction from the measured impurities, with rare earth impurities determined to GB/T 18115.5 and non-rare earth impurities to GB/T 12690, and the buyer has two months from receipt of the goods to raise a claim.
It replaces GB/T 2968-2008, was issued on 19 November 2020 and has applied since 1 October 2021.
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Document preview — GB/T 2968-2020
National Standard of the People's Republic of China
- ICS
- 77.120.99
- Classification
- H 65
- Replacing
- GB/T 2968-2008
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope5
- 2 Normative references5
- 3 Technical requirements5
- 4 Test method6
- 5 Inspection rules7
- 6 Marking, packaging, transportation, storage and quality certificate8
1 Scope
This Standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation, storage and quality certificate of samarium metal.
This Standard applies to the samarium metal that is produced by the metal thermal reduction method, which is mainly used as rare earth permanent magnet materials and metal additives.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 8170, Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 12690, Chemical analysis methods of non-rare earth impurities in rare earth metals and the 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 18115.5, Chemical analysis methods of rare earth impurities in rare earth metals and their oxides Samarium - Determination of lanthanum, cerium, praseodymium, neodymium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium
3 Technical requirements
3.1 Product classification
The products are divided into five designations of Sm-4N, Sm-3N5, Sm-3N, Sm-2N5, and Sm-2N according to their chemical composition. The method of expressing product designations shall meet the requirements of GB/T 17803.
4 Test method
4.1.3 The content of the main rare earth element (Sm) is obtained by the subtraction method, that is, the difference between the total content of elements (100%) and the total content of impurity elements (the combined content of rare earth impurities and non-rare earth impurities).
4.1.4 The analysis method of the total content of rare earths (RE) shall be carried out in accordance with the provisions of GB/T 14635. When the measured total content of rare earths is above 99%, the actual value of the total content of rare earths is calculated by the subtraction method, that is, the difference between the total content of elements (100%) and the content of non-rare earth impurities.
4.1.5 The relative purity of the main rare earth elements (Sm/RE) is calculated, which is the percentage of the content of the main rare earth elements to the total content of rare earth elements.
4.2 Numerical rounding
Rounding off the value shall be carried out in accordance with the provisions of GB/T 8170.
4.3 Appearance quality
Under natural scattered light, check visually.
5 Inspection rules
5.1 Inspection and acceptance
5.1.1 The supplier's quality inspection department shall inspect products, to ensure that the product quality meets the requirements of this Standard, and fill in the product quality certificate.
5.1.2 The buyer shall inspect the received product in accordance with the provisions of this Standard. If the inspection result does not conform to the provisions of this Standard, it shall be submitted to the supplier within 2 months from the date of receipt of the product, and the supplier and the buyer shall negotiate and resolve it. If arbitration is required, an organization that is recognized by both parties can be entrusted to conduct a joint sampling on the buyer's side.
5.2 Batch
Products shall be submitted for inspection in batches; each batch shall consist of products of the same designation. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 8170Rules of rounding off for numerical values & expression and judgement of limiting values
- GB/T 14635Rare earth metals and their compounds - Determination of total rare earth content
- GB/T 17803Designation system for rare earth products
- GB/T 18115.5Chemical analysis methods of rare earth impurities in rare earth metals and their oxides Samarium-Determination of lanthanum, cerium, praseodymium, neodymium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium contents
GB/T 12690
Similar standards
Editions of GB/T 2968
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 2968-2020 | Samarium metal | current edition | Current |
| GB/T 2968-2008 | Samarium metal | previous edition | Superseded |
This page sells the current edition, GB/T 2968-2020. Earlier editions are listed for reference only.
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Related Standards
GB/T 12690.1-2022 — Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 1: Determination of carbon and sulfur contents - High frequency-infrared absorption method
GB/T 12690.10-2003 — Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides--Determination of phosphorus content by molybdenum blue spectrophotometric method
GB/T 12690.11-2025 — Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 11: Determination of magnesium content - Flame atomic absorption spectrometric method
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