GB/T 40854-2021Lanthanum-cerium metal (English PDF)
镧铈金属
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
October 11, 2021
Implementation date
May 1, 2022
Scope
GB/T 40854-2021 is the English-translated version of 镧铈金属.
GB/T 40854-2021 is the Chinese national product standard for lanthanum-cerium metal made by molten salt electrolysis or by fusion, used to produce hydrogen storage alloys, steel and non-ferrous alloys.
It divides the product into nine designations according to chemical composition, from LaCe-61CeA to LaCe-69CeC, named according to GB/T 17803, and sets the chemical composition each designation must meet, with a metal whose cerium content falls on the boundary between two designations assigned to the higher-cerium one.
It also covers the test methods, the inspection rules, including how composition samples are drilled from the ingot and how a batch is judged, and the marking, packaging, transport, storage and accompanying documents, which follow GB 39176. It was issued on 11 October 2021 and has applied since 1 May 2022.
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Document preview — GB/T 40854-2021
National Standard of the People's Republic of China
- ICS
- 77.120.99
- Classification
- H 65
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative References4
- 3 Terms and Definitions5
- 4 Classification and Designation5
- 5 Technical Requirements5
- 6 Test Methods6
- 7 Inspection Rules7
- 8 Marking, Packaging, Transportation, Storage and Accompanying Documents8
1 Scope
This Document specifies the classification and designation, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage and accompanying documents of lanthanum-cerium metal.
This Document is applicable to lanthanum-cerium metals produced by molten salt electrolysis or fusion method for the production of hydrogen storage alloys, steel and non-ferrous metal alloys, etc.
2 Normative References
The provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document.
GB/T 8170 (all parts) 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 39176 Rare earth products packing, marking, transport and storage
GB/T 40795.1 Chemical analysis method of lanthanum-cerium metals and their compounds -Part 1: Determination of cerium content - Ammonium ferrous sulfate titration method
GB/T 40795.2 Chemical analysis methods of lanthanum-cerium metals and their compounds -Part 2: Determination of rare earth content
3 Terms and Definitions
For the purposes of this Document, there are no terms and definitions apply.
4 Classification and Designation
4.1 Classification
The product can be divided into the following 9 designations according to their chemical compositions, such as LaCe-61CeA, LaCe-61CeB, LaCe-61CeC, LaCe-65CeA, LaCe-65CeB, LaCe-65CeC, LaCe-69CeA, LaCe-69CeB and LaCe-69CeC.
4.2 Expression method of product designation
The expression methods of the designations of rare earth products shall comply with the provisions of GB/T17803.
5 Technical Requirements
5.1 Chemical composition
The chemical composition of the product shall comply with the provisions of Table 1. When the content of cerium (Ce) in the product is the overlapping value of the boundaries of two adjacent designations, it belongs to the designation with high cerium (Ce) content. If the purchaser has special requirements for the product, the supplier and purchaser can negotiate separately.
7 Inspection Rules
7.4.2 Sampling method for chemical composition analysis: when sampling, firstly polish the sample, use a drill bit with a diameter of 5 mm ~ 10 mm to drill more than 3 points at equal distances from the upper and lower sides of the alloy ingot; and discard the drill chips about 0.5 mm ~ 1.0mm from the surface of the ingot. And then drill the sample; the sampling volume of each point is no less than 10g; quickly mix the obtained sample to reduce to the required quantity; and immediately seal and store; the oxidation of the sample shall be prevented during the sampling process.
7.5 Judgment of test results
7.5.1 If the chemical composition analysis results are inconsistent with the provisions of this Document, take double samples from this batch of products to re-inspect the unqualified items.
If there are still any unqualified results, the batch of products shall be judged as unqualified.
7.5.2 If the results of the appearance quality inspection do not conform to the provisions of this Document, the batch of products shall be directly judged as unqualified.
8 Marking, Packaging, Transportation, Storage and Accompanying Documents
8.1 Marking, packaging, transportation, storage
It shall meet the requirements of GB 39176.
8.2 Accompanying documents
Each batch of products shall be accompanied by accompanying documents, which shall include:
a) Quality certificate, the content is as follows:
- Supplier name;
- Product name and designation;
- Net weight and number of pieces;
- The number of this Document;
- Exit-factory date;
- Various analysis and inspection results and the seal of the supplier's quality inspection department.
b) Product certificate, the content is as follows: […]
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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 39176Rare earth products packing, marking, transport and storage
- GB/T 40795.1Chemical analysis method of lanthanum-cerium metals and their compounds—Part 1: Determination of cerium content—Ammonium ferrous sulfate titration method
- GB/T 40795.2Chemical analysis methods of lanthanum-cerium metals and their compounds—Part 2: Determination of rare earth content
GB/T 12690
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Related Standards
GB 39176-2020 — Rare earth products packing, marking, transport and storage
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
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