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GB/T 29655-2025: Strip-casting neodymium iron boron alloy flakes
Status: Valid GB/T 29655: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 29655-2025 | English | 279 |
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Strip-casting neodymium iron boron alloy flakes
| Valid |
GB/T 29655-2025
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| GB/T 29655-2013 | English | 148 |
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Neodymium iron boron strip casting
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GB/T 29655-2013
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Basic data | Standard ID | GB/T 29655-2025 (GB/T29655-2025) | | Description (Translated English) | Strip-casting neodymium iron boron alloy flakes | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H65 | | Classification of International Standard | 77.120.99 | | Word Count Estimation | 14,194 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 29655-2013 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | GB/T 29655-2025: Strip-casting neodymium iron boron alloy flakes---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/GBT29655-2025
ICS 77.120.99
CCSH65
National Standard of the People's Republic of China
Replaces GB/T 29655-2013
Rapidly solidified NdFeB alloy sheet
Released on August 29, 2025
Implementation on March 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB/T 29655-2013 "NdFeB Rapid Solidification Thin Sheet Alloy". Compared with GB/T 29655-2013, except for the structural adjustment
Besides the editorial changes, the main technical changes are as follows.
a) The terms and definitions have been changed (see Chapter 3, Chapter 3 of the.2013 edition);
b) Product classification has been deleted (see 4.1 of the.2013 edition);
c) Changed the requirements for main components from "main chemical composition control accuracy" to "main component tolerance" (see 4.1,.2013
4.3 of the.2012 edition);
d) The requirements for impurity content have been changed (see 4.2, 4.4 of the.2013 edition);
e) The thickness requirements have been changed (see 4.3, 4.5 of the.2013 edition);
f) The requirements for microstructure have been changed (see 4.4, 4.6 of the.2013 edition);
g) The content of “Packaging, Marking, Transport, Storage and Accompanying Documents” has been changed (see Chapter 7, Chapter 7 of the.2013 edition);
h) The microstructure examination method has been changed (see Appendix B, 5.3.4 of the.2013 edition).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed and coordinated by the National Rare Earth Standardization Technical Committee (SAC/TC229).
This document was drafted by. Youyan Rare Earth New Materials Co., Ltd., Baotou Yingsite Rare Earth Magnetic New Materials Co., Ltd., China Rare Earth (Micro
Shandong Rare Earth New Materials Co., Ltd., Qiandong Rare Earth Group Co., Ltd., Baotou Rare Earth Research Institute, Anhui Dadixiong New Materials Co., Ltd.
Co., Ltd., Youyan Rare Earth (Rongcheng) Co., Ltd., Baotou Tianhe Magnetic Materials Technology Co., Ltd., China Northern Rare Earth (Group) High-Tech Co., Ltd.
Company, Fujian Jinlong Rare Earth Co., Ltd., Ningbo Tongchuang Strong Magnetic Materials Co., Ltd., Baotou Sanlong Rare Metal Materials Co., Ltd.
Company, Nonferrous Metals Technology and Economics Research Institute Co., Ltd.
The main drafters of this document are. Wang Zilong, Yang Yuanfei, Peng Haijun, Luo Yang, Yu Dunbo, Dong Gaihua, Li Jun, Yao Nanhong, Huang Xiulian, Liu Youhao,
Yan Wenlong, Lin Xiao, Zhang Hongbin, Wu Kaiwen, Gao Haiqiang, Li Zhiqiang, Lü Ke, Huang Shulin, Huang Qingfang, Shi Chao, Chen Kan, Cao Zheng, Zhang Wei, Zhu Qing,
Hou Changchun, Li Mianfu, Shen Lihan, and Wu Cenyang.
This document was first published in.2013 and this is the first revision.
Rapidly solidified NdFeB alloy sheet
1 Scope
This document specifies the technical requirements, test methods, inspection rules, packaging, marking, transportation, storage and accompanying materials of rapid solidification NdFeB alloy sheets.
document.
This document applies to the inspection and production of rapidly solidified NdFeB alloy sheets for sintered NdFeB permanent magnet materials.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 8170 Rules for rounding off values and expression and determination of limit values
GB/T 15676 Rare Earth Terminology
GB 39176 Packaging, labeling, transportation and storage of rare earth products
XB/T 617.1 Chemical analysis methods for NdFeB alloys - Part 1.Determination of total rare earth content - Oxalate gravimetric method
XB/T 617.2 Chemical analysis methods for neodymium iron boron alloys - Part 2.Determination of the content of fifteen rare earth elements
XB/T 617.3 Chemical analysis methods for NdFeB alloys - Part 3.Boron, aluminum, copper, cobalt, magnesium, silicon, calcium, vanadium, chromium, manganese, nickel, zinc and
Determination of gallium content by inductively coupled plasma atomic emission spectrometry
XB/T 617.6 Chemical analysis methods for NdFeB alloys - Part 6.Determination of carbon content - High frequency-infrared absorption method
XB/T 617.7 Chemical analysis methods for NdFeB alloys - Part 7.Determination of oxygen and nitrogen content - Pulse-infrared absorption method and pulse-thermal method
Guidance
3 Terms and Definitions
The terms and definitions defined in GB/T 15676 and the following apply to this document.
3.1
The molten NdFeB alloy is poured onto a rotating metal cooling roller to rapidly solidify the melt into a thin sheet product.
3.2
The surface of the rapidly solidified NdFeB alloy sheet that contacts the surface of the metal cooling roller during the preparation process.
3.3
During the preparation process of the rapidly solidified NdFeB alloy sheet, the surface is opposite to the roller surface and in contact with the ambient atmosphere.
3.4
In a certain thickness measurement sample, the ratio of the number of samples within a certain thickness range to the total number of samples measured is specified.
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