GB/T 14986-2008Soft magnetic alloys - Part 1: General requirements (English PDF)

Foreword

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 is Part 1 of GB/T 14986 "Soft Magnetic Alloys". GB/T 14986 has been published in the following parts.

--- Part 1: General requirements;

--- Part 2: Iron-nickel alloys;

--- Part 3: Iron-cobalt alloys;

--- Part 4: Iron-chromium alloys;

--- Part 5: Iron and aluminum alloys.

This document replaces GB/T 14986.1-2018 "Soft magnetic alloys Part 1: General requirements", GB/T 15013-1994 "Precision alloys this document is based on GB/T 14986.1-2018 and integrates the content of GB/T 15013-1994.

Compared with GB/T 14986.1-2018, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

a) The scope has been changed (see Chapter 1, Chapter 1 of the 2018 edition);

b) Changed terms and definitions (see Chapter 3, Chapter 3 of the 2018 edition);

c) The classification has been changed (see Chapter 4, Chapter 4 of the 2018 edition);

d) The order content has been changed (see Chapter 5, Chapter 5 of the 2018 edition);

e) Added the vacuum induction arc remelting smelting method and deleted the electric arc furnace smelting method (see 6.1, 7.2 of the 2018 edition);

f) Warm-rolled strip has been deleted (see 6.5 and 7.5.5 of the 2018 edition);

g) Changed the surface quality requirements for hot-rolled round wire rod, hot-rolled plate, and hot-rolled (forged) bar (see 7.3.5, 7.5.6 of the 2018 edition);

h) Changes to the dimensions and shape of cold-rolled strip, cold-drawn (rolled) tube, hot-rolled plate, hot-rolled (forged) bar, and turned and polished bar (See 7.4.1, 7.4.4, 7.4.6, 7.4.7, 7.4.8, and 6.1, 6.7, 6.8, and 6.9 of the 2018 edition);

i) The test method has been changed (see 8.1.1, 8.2, 8.3.1, Chapter 8 of the 2018 edition);

j) Added chemical composition retest and determination rules (see 9.4.1);

k) The packaging, labeling, storage and quality certification requirements have been changed (see Chapter 10, Chapter 10 of the 2018 edition);

l) The measurement method of DC magnetic properties of soft magnetic alloys (see Appendix B of the 2018 edition) has been deleted.

Introduction

Soft magnetic alloys are a type of alloy with high magnetic permeability and low coercivity in weak magnetic fields. They are widely used in radio electronics industry, precision in instruments, remote control and automatic control systems, it is mainly divided into iron-nickel soft magnetic alloys, iron-cobalt soft magnetic alloys, iron-aluminum and other soft magnetic alloys it is a very important material in the modern industrial field.

GB/T 14986 "Soft Magnetic Alloys" aims to standardize the production, procurement and application of soft magnetic alloys and is intended to consist of four parts.

--- Part 1: General requirements. The purpose is to specify requirements that are common to other parts so that they can be referenced in other parts.

--- Part 2: Iron-nickel alloys. The purpose is to specify the technical requirements of iron-nickel soft magnetic alloys.

--- Part 3: Iron-cobalt alloys. The purpose is to specify the technical requirements of iron-cobalt soft magnetic alloys.

--- Part 4: Other alloys. The purpose is to specify the technical specifications of other soft magnetic alloys except iron-nickel and iron-cobalt soft magnetic alloys, such as iron and aluminum.

Require.

Soft magnetic alloys Part 1: General requirements

1 Scope

This document provides the classification and symbols of soft magnetic alloys, and specifies the order content, manufacturing process, technical requirements, inspection rules, packaging, labeling, etc.

The corresponding test methods are described in the label, storage and quality certificate.

This document is applicable to cold-rolled strip, cold-rolled plate, cold-drawn wire, cold-drawn (rolled) pipe, hot-rolled round wire, hot-rolled plate, hot-rolled Rolled (forged) bars and turned or polished bars (hereinafter referred to as alloy bars).

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 223 (all parts) Chemical analysis methods for steel and alloys GB/T 3658 Measurement of magnetic properties of soft magnetic metal materials and powder metallurgy materials in the frequency range of 20 Hz to 100 kHz using annular specimens method GB/T 8170 Rules for rounding off values and expression and determination of limit values GB/T 13012 Measurement method of DC magnetic properties of soft magnetic materials GB/T 13297 General provisions for packaging, marking and quality certificates of precision alloys GB/T 14981 Dimensions, shape, weight and tolerances of hot-rolled round wire rod GB/T 20066 Sampling and preparation of samples for determination of chemical composition of steel and iron

3 Terms and Definitions

The following terms and definitions apply to this document.

soft magnetic alloy softmagneticaloy it is easy to magnetize under the action of external force, and the magnetic induction intensity basically disappears after the external magnetic field is removed. The coercive force is generally lower than 0.8kA/m.

alloy.

[Source. GB/T 20566-2006, 3.2.3, modified] 3.2 Magnetic induction magnetic flux density A diverging axis vector that determines the magnitude and direction of the magnetic field at any point in space.

Note. The force F on the charge moving at a certain speed at this point is equal to the charge Q multiplied by the vector product of the velocity v and the magnetic induction intensity B.

F=Qv×B