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Soft magnetic alloys - Part 5: Iron-aluminum alloys
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GB/T 14986.5-2018: PDF in English (GBT 14986.5-2018) GB/T 14986.5-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.40
H 58
Replacing GB/T 14986-2008
Soft magnetic alloys – Part 5. Iron-aluminum alloys
ISSUED ON. MAY 14, 2018
IMPLEMENTED ON. FEBRUARY 1, 2019
Issued by. State Administration for Market Regulation of the People's
Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Classification ... 6
5 Ordering content ... 7
6 Dimensions and shapes ... 7
7 Technical requirements ... 7
8 Test methods ... 10
9 Inspection rules ... 10
10 Packaging, marking and quality certification ... 11
Annex A (Informative) Recommended sample heat treatment system ... 12
Annex B (Informative) Basic physical parameters and typical mechanical
properties of alloys ... 14
Foreword
GB/T 14986, Soft magnetic alloys, comprises 5 parts.
-- Part 1. General requirements;
-- Part 2. Iron-nickel alloys;
-- Part 3. Iron-cobalt alloys;
-- Part 4. Iron-chromium alloys;
-- Part 5. Iron-aluminum alloys.
This Part is Part 5 of GB/T 14986.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part replaces the iron-aluminum part of GB/T 14986-2008, High saturation
magnetic induction, magnetic compensate alloys depending on temperature variation,
corrosion-resisting, iron-aluminum, permanent permeability, soft magnetic alloys.
Compared with GB/T 14986-2008, the major technical changes of this Part are as
follows.
-- it adds rod 1J12 and relevant technical requirements (see 7.4.2 of Clause 6);
-- it supplements the basic physical parameters and typical mechanical properties
of alloys (see Annex B).
This Part was proposed by China Iron and Steel Association.
This Part shall be under the jurisdiction of National Technical Committee 183 on Iron
and Steel of Standardization Administration of China (SAC/TC 183).
The drafting organizations of this Part. Dongbei Special Steel Group Dalian Precision
Alloys Co., Ltd., Central Iron and Steel Research Institute, China Metallurgical
Information and Standardization Institute.
The main drafters of this Part. Xu Xiaoping, Luan Yan, Zhang Jinglin, Dai Qiang, Yan
Chengming.
The previous editions of the standard replaced by this Part are as follows.
-- GBn 203-1983, GBn 203-1988;
-- GB/T 15004-1994;
Soft magnetic alloys – Part 5. Iron-aluminum alloys
1 Scope
This Part of GB/T 14986 specifies the terms and definitions, classification, ordering
content, dimensions, shape, technical requirements, inspection rules, test methods,
packaging, marking, quality certification, etc. of iron-aluminum soft magnetic alloys.
This Part applies to iron-aluminum soft magnetic cold-rolled strips, warm-rolled strips,
hot-rolled (forged) rods and polished or ground rods (hereinafter referred to as alloys).
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to this document.
GB/T 223.5, Steel and iron – Determination of acid-soluble silicon and total silicon
content – Reduced molybdosilicate spectrophotometric method
GB/T 223.8, Methods for chemical analysis of iron, steel and alloy – The sodium
fluoride separation-EDTA titration method for the determination of aluminium
content
GB/T 223.59, Iron, steel and alloy – Determination of phosphorus content –
Bismuth phosphomolybdate blue spectrophotometric method and antimony
phosphomolybdate blue spectrophotometric method
GB/T 223.64, Iron, steel and alloy – Determination of manganese content – Flame
atomic absorption spectrometric method
GB/T 223.79, Iron and steel – Determination of multi-element contents – X-ray
fluorescence spectrometry (Routine method)
GB/T 223.85, Steel and iron – Determination of sulfur content – Infrared absorption
method after combustion in an induction furnace
GB/T 223.86, Steel and iron – Determination of total carbon content – Infrared
absorption method after combustion in an induction furnace
GB/T 228.1, Metallic materials – Tensile testing – Part 1. Method of test at room
temperature
GB/T 231.1, Metallic materials – Brinell hardness test – Part 1. Test method
GB/T 2975, Steel and steel products – Location and preparation of samples and
test pieces for mechanical testing
GB/T 4340.1, Metallic materials – Vickers hardness test – Part 1. Test method
GB/T 6146, Test method for resistivity of precision resistance alloys
GB/T 14986.1-2018, Soft magnetic alloys – Part 1. General requirements
GB/T 20066, Steel and iron – Sampling and preparation of samples for the
determination of chemical composition
GB/T 20123, Steel and iron – Determination of total carbon and sulfur content
Infrared absorption method after combustion in an induction furnace (routine
method)
GB/T 20125, Low-alloy steel – Determination of multi-element contents –
Inductively coupled plasma atomic emission spectrometric method
3 Terms and definitions
For the purposes of this document, the following terms and definitions defined in GB/T
14986.1-2018 apply.
4 Classification
In accordance with the main characteristics of alloys, iron-aluminum alloys can be
classified into the categories as follows.
a) high saturation magnetic induction intensity iron-aluminum alloy 1J6;
b) high saturation magnetic induction, high permeability and low residual magnetic
induction density iron-aluminum alloy 1J12;
c) high saturation magnetostriction coefficient iron-aluminum 1J13;
d) high permeability high resistance iron-aluminum alloy 1J16.
Annex A
(Informative)
Recommended sample heat treatment system
A.1 In general cases, sample is preferably heat treated in pure hydrogen whose dew
point is not higher than - 40°C. If vacuum heat treatment is required, it is recommended
to be carried out in vacuum whose residual pressure is not greater than 0.1 Pa.
A.2 All mechanical processes (such as punching, shearing, winding and deburring) for
sample preparation shall be carried out before heat treatment. Before heat treatment,
sample shall be removed of oil to ensure cleanliness. After annealing, the surface of
sample is preferably smooth. During the process of annealing, adhesion or mechanical
deformation is not allowed.
A.3 For the recommended sample heat treatment system see Table A.1.
Table A.1 – Recommended sample heat treatment system
Alloy designation Heating temperature/°C Holding time/h Cooling system Application
1J6
950 ~ 1050 2 ~ 3
Cool to 200°C at the
speed of 100°C/h ~
150°C/h before
drawing a discharge
900 ~ 1,000 2 ~ 3
Cool to 250°C
before drawing a
discharge
Applicable to
magnetic valve iron
core
1J12a 1,050 ~ 1,200 2 ~ 3
Cool to 500°C at the
speed of 100°C/h ~
150°C/h; then cool
rapidly (by air blast)
to 200°C before
drawing a discharge
1J13a
900 ~ 950 2
Cool to 650°C at the
speed of 100°C/h;
then cool to 200°C
at the speed of not
greater than 60°C/h
before drawing a
discharge
780 ~ 800 2 Cool to 650°C at the speed of 100°C/h;
Applicable to
elements which
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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