GB/T 14991-2016Deformable permanent-magnet steels (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 14991-1994 Deformable permanent-magnet steels. Compared with GB/T 14991-1994, the main modifications are as follows: - added "normative references"; - added "order content"; - modified the thickness deviation of the cold rolled strip from negative to positive and negative; - modified the smelting method from "non-vacuum induction" to "vacuum induction"; - deleted "marking example"; - modified the magnetic performance indicators as the international unit system. This Standard was proposed by China Iron and Steel Industry Association. This Standard shall be under the jurisdiction of National Technical Committee on Steels of Standardization Administration of China (SAC/TC 183). Main drafting organizations of this Standard. Iron and Steel Research Institute, Metallurgical Industry Information Standards Institute. Main drafters of this Standard. Yu Yipeng, Zhang Jinglin, Wu Bin, Lu Fengshuang, Zhang Jiansheng, Zhang Jianfu, Yan Zhengming. Versions of standard substituted by this Standard are. - GBn 174-1982; - GB/T 14991-1994. Deformable permanent-magnet steels

1 Scope

GB/T 14991-2016 is the Chinese national standard on deformable permanent-magnet steels, in the field of metallurgy. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 24 February 2016 by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China, and has been in force since 1 November 2016. Classification: ICS 77.140.40, CCS H58. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This Standard specifies the designations, dimensions, shapes and tolerances, technical requirements, test methods, inspection rules, packaging, marks and quality certificates of deformable permanent-magnet steels. This Standard is applicable to the deformable permanent-magnet cold rolled strips, hot rolled (forged) bars and flat materials used to manufacture permanent magnets.

2 Normative references

The 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 223.5, Methods for chemical analysis of iron, steel and alloy - The reduced molybdosilicate spectrophotometric method for the determination of acid-soluble silicon content

GB/T 223.11, Iron, Steel and Alloy - Determination of Chromium Content - Visual Titration or Potentiometric Titration Method

GB/T 223.20, Methods for chemical analysis of iron steel and alloy - The Potentiometric titration method for the determination of cobalt content

GB/T 223.23, Iron, Steel and Alloy-Determination of Nickel Content - The Dimethylglyoxime Spectrophotometric Method

GB/T 223.28, Methods for chemical analysis of iron, steel and alloy - The alpha-benzoinoxime gravimetric method for the determination of molybdenum content

GB/T 223.43, Iron steel and alloy - Determination of tungsten content - Gravimetryc method and spectrophotometric method

GB/T 223.62, Methods for chemical analysis of iron, steel and alloy - The butyl acetate extraction photometric method for the determination of phosphorus content

GB/T 223.64, Iron, Steel and Alloy - Determination of Manganese Content - Flame Atomic Absorption Spectrometric Method

GB/T 223.68, Methods for Chemical Analysis of Iron, Steel and Alloy - The Potassium Iodate Titration Method after Combustion in the Pipe Furnace for the Determination of Sulfur Content

GB/T 223.69, Iron, Steel and Alloy-Determination of Carbon Contents- Gas-volumetric Method after Combustion in the Pipe Furnace

GB/T 231.1, Metallic materials - Brinell hardness test - Part 1. Test method

GB/T 11170, Stainless steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (Routine method)

GB/T 13012, Methods of measurement of d.c. magnetic properties of magnetically soft materials

3 Order content

The contract or order in accordance with this Standard shall include the following information.

a) reference to this Standard;

b) designations;

d) weight or quantity;

e) delivery status;

f) other special requirements made by the purchaser shall be determined by consultation between the supplier and the purchaser and indicated in the contract.

7 Inspection rules

7.1 Inspection and acceptance The inspection and acceptance of permanent-magnet steels shall be carried out by the supplier quality inspection departments. The purchaser shall also carry out the inspection in accordance with the provisions of this Standard.

7.2 Batching rule The permanent-magnet steels shall be submitted for inspection and acceptance by batches. Each batch shall consist of the permanent-magnet steels of same designation, same melting furnace number, same specification, same processing method and same delivery status.

7.3 Sampling part and sampling quantity The sampling quantity and sampling part of permanent-magnet steel shall comply with the provisions of Table 8.

8 Packaging, marks and quality certificate

8.1 The packaging, marks and quality certificate of permanent-magnet steels shall meet the requirements of YB/T 5242.

8.2 With the agreement of the supplier and the purchaser, the supplier can use other materials that can ensure that the surface quality and magnetic properties of the permanent magnet are not affected in the transportation and storage for packaging.