GB/T 14987-2016 English PDF (GBT14987-2016)

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GB/T 14987-2016: Iron-Nickel soft magnetic alloy -- Cold-rolled strips with high hardness and high electrical resistance
GB/T 14987-2016
GB
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.40
H 58
Replacing GB/T 14987-1994
Iron-nickel soft magnetic alloy cold-rolled strips with
high hardness and high electrical resistance
ISSUED ON. DECEMBER 13, 2016
IMPLEMENTED ON. SEPTEMBER 01, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine 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 Classification and code ... 6 
4 Order content ... 7 
5 Size and shape ... 7 
5.1 Size and allowable deviation ... 7 
5.2 Shape ... 8 
6 Technical requirements ... 8 
6.1 Designation and chemical composition ... 8 
6.2 Smelting method ... 8 
6.3 Delivery status ... 8 
6.4 Magnetic properties ... 9 
6.5 Resistivity ... 10 
6.6 Vickers hardness ... 10 
6.7 Surface quality ... 11 
7 Test method ... 11 
8 Inspection rules ... 12 
8.1 Inspection and acceptance ... 12 
8.2 Batching rules ... 12 
8.3 Sampling quantity and sampling location ... 12 
8.4 Re-inspection and judgment rules ... 12 
9 Packaging, marking and quality certificate ... 13 
Appendix A (Informative) Recommended heat treatment system for samples
... 14 
Appendix B (Informative) Basic physical parameters of alloy ... 15 
Foreword
This standard was drafted in accordance with the rules given in GB/T
1.1-2009.
This standard replaces GB/T 14987-1994 “High permeability alloys with high
hardness and high electrical resistance”.
As compared with GB/T 14987-1994, the main technical changes of this
standard are as follows.
- CHANGE the standard name into “Iron-nickel soft magnetic alloy
cold-rolled strips with high hardness and high electrical resistance”;
- ADD the “order content” (SEE Chapter 4);
- MODIFY the lower limit of strip thickness to 0.04 mm (SEE 5.1);
- CHANGE the thickness deviation from negative deviation to positive and
negative deviation (SEE 5.1);
- ENLARGE the maximum width of the strip to 220 mm and 300 mm,
respectively (SEE 5.1);
- IMPROVE the requirement strictness for strip roughness (SEE 5.2.1);
- DELETE the requirements for the roll inner diameter (SEE 1.4 of 1994
version);
- ADD the requirements for trimming burrs (SEE 5.2.2);
- DELETE three designations “1J89”, “1J90” and “1J91” (SEE 2.1 of 1994
version);
- MODIFY the Mn content of 1J88 to 0.3% ~ 0.6% (SEE 6.1);
- ADD the delivery status of “annealed soft” (SEE 6.3);
- MODIFY the magnetic performance requirements; UNIFY the magnetic
properties physical units into the international unit system (SEE 6.4);
- ADD the hardness requirements; MAKE specifications respectively based
on hard state and soft state (SEE 6.6);
Iron-nickel soft magnetic alloy cold-rolled strips with
high hardness and high electrical resistance
1 Scope
This standard specifies the classification and code, order content, size, shape,
technical requirements, test methods, inspection rules, packaging, marking
and quality certificate of 1J87 and 1J88 iron-nickel soft magnetic alloys.
This standard applies to the 1J87, 1J88 alloy cold rolled strip used to produce
magnetic components with abrasion resistance (hereinafter referred to as alloy
strip), such as. audio head sensor chip, ATM machine head, currency detector
head, special transformers, and sensors components and so on.
2 Normative references
The following documents are essential to the application of 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) are applicable to this Standard.
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 223.25 Methods for chemical analysis of iron, steel and alloy - The
dimethyglyoxime gravimetric method for the determination of nickel content
GB/T 223.28 Methods for chemical analysis of iron, steel and alloy - The
α-benzoin oxime gravimetric method for the determination of molybdenum
content
GB/T 223.38 Methods for chemical analysis of iron, steel and alloy - Ion
exchange separation-gravimetric method for the determination of niobium
content
GB/T 223.59 Iron and steel alloys - Determination of phosphorus content -
Bismuth phosphomolybdate blue spectrophotometric method and antimony
phosphomolybdate blue spectrophotometric method
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The
sodium periodate (potassium) spectrophotometric method for the
determination of manganese content
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 3658 Methods of measurement of AC magnetic properties of
magnetically soft materials
GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1. Test method
GB/T 6146 Test method for resistivity of precision resistive alloys
GB/T 13012 Methods of measurement of DC magnetic properties of
magnetically soft materials
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
YB/T 5242 General rules of packaging, marking, and quality certification for
precision alloys
3 Classification and code
The alloy is divided as follows based on the delivery status.
a) Cold-rolled hard state H;
b) Annealed soft state S.
be measured with the measuring gauge of minimum scale value of 0.001 mm;
the alloy strip width shall be measured with the measuring gauge of minimum
scale value of 0.01 mm; AND the alloy camber measurement methods. CUT a
1000 mm length finished strip and PLACE horizontally on the platform;
ATTACH the steel plate ruler to the concave edge of the strip width side, to
measure the maximum distance between the strip and the ruler.
8 Inspection rules
8.1 Inspection and acceptance
Inspection and acceptance of alloy strip shall be conducted by the technical
supervision department of the supplier.
8.2 Batching rules
The alloy strip shall be submitted for inspection and acceptance in batches.
Each batch shall consist of the alloy strips of the same alloy designation, the
same furnace number, the same size, the same delivery status, and the same
heat treatment system.
8.3 Sampling quantity and sampling location
The sampling quantity and the sampling location on each batch of cold rolled
strip shall comply with the requirements of Table 7.
8.4 Re-inspection and judgment rules
8.4.1 When the magnetic property test is disqualified, it is allowed to re-sample
and change the heat treatment system for inspection, AND only those qualified <...