ASTM A901 - 19

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Designation: A901 −19
Standard Speciﬁcation for
Amorphous Magnetic Core Alloys, Semi-Processed Types
1
This standard is issued under the ﬁxed designation A901; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This speciﬁcation covers the general requirements to
which ﬂat-cast, amorphous, semi-processed, iron-base mag-
netic core alloys must conform.
1.2 These alloys are produced by a rapid-quenching, direct-
casting process, resulting in metals with noncrystalline (amor-
phous) structure. The metallic alloys are made to meet speci-
ﬁed maximum core-loss values and are intended primarily for
commercial power frequency (50- and 60-Hz) applications in
magnetic devices. Desirable core-loss and permeability char-
acteristics are developed by further heat treatment in a mag-
netic ﬁeld by the user. The heat treatment typically consists of
heating the material to a temperature of 320 to 420°C in a dry,
inert atmosphere for 5 to 10 min, although soak times of up to
2 h may be used for large transformer cores. A magnetic ﬁeld
may be required during annealing as designated by the pro-
ducer. Exact optimum annealing conditions depend on the
processing of the material and the size and shape of the device.
1.3 Some of these alloys are sensitive to mechanical stress.
Care must be exercised in minimizing any stresses on the
material in its ﬁnal application, otherwise, its magnetic prop-
erties will be signiﬁcantly impaired.
1.4 This speciﬁcation is developed to aid in the purchase of
transformer grade amorphous strip. It provides the chemical,
physical, and magnetic parameters and procedures for quality
control tests.
1.5 The values stated in SI units are to be regarded as
standard. The values given in parentheses are numerical
conversions to customary (cgs and inch-pound) units which are
provided for information only and are not considered standard.
1.6 This standard does not purport to address the safety
concerns associated with its use. It is the responsibility of the
user of this standard to establish appropriate safety, health,
and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.7 This international standard was developed in accor-
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
2
A34/A34M Practice for Sampling and Procurement Testing
of Magnetic Materials
A340 Terminology of Symbols and Deﬁnitions Relating to
Magnetic Testing
A712 Test Method for Electrical Resistivity of Soft Mag-
netic Alloys
A773/A773M Test Method for Direct Current Magnetic
Properties of Low Coercivity Magnetic Materials Using
Hysteresigraphs
A900/A900M Test Method for Lamination Factor of Amor-
phous Magnetic Strip
A912/A912M Test Method for Alternating-Current Mag-
netic Properties of Amorphous Materials at Power Fre-
quencies Using Wattmeter-Ammeter-Voltmeter Method
with Toroidal Specimens
A932/A932M Test Method for Alternating-Current Mag-
netic Properties of Amorphous Materials at Power Fre-
quencies Using Wattmeter-Ammeter-Voltmeter Method
with Sheet Specimens
C693 Test Method for Density of Glass by Buoyancy
D3455 Test Methods for Compatibility of Construction Ma-
terial with Electrical Insulating Oil of Petroleum Origin
3. Terminology
3.1 The terms and symbols used in this speciﬁcation are
deﬁned in Terminology A340.
4. Classiﬁcation
4.1 The classiﬁcation of iron-based amorphous alloys con-
forming to this material speciﬁcation are given in Table 1 and
Table 2.
1
This speciﬁcation is under the jurisdiction of ASTM Committee A06 on
Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on
Material Speciﬁcations.
Current edition approved Aug. 1, 2019. Published August 2019. Originally
approved in 1990. Last previous edition approved in 2012 as A901 – 12. DOI:
10.1520/A0901-19.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
1
 

4.2 The material name in Table 1 and Table 2 comprises the

following in the order given.

4.2.1 The letter AM for amorphous magnetic material,

4.2.2 The two-digit number following AM indicating one

hundred times the speciﬁc value of maximum speciﬁc core loss

at 1.3 T (13 000 G) magnetic ﬂux density level at 60 Hz in

watts per kilogram (watts per pound),

4.2.3 The two-digit number following maximum speciﬁc

core loss designation indicating one thousand times the nomi-

nal thickness of the strip in millimetres,

4.2.4 The alphabet letters, S and P, following strip thickness

for conventional and high permeability grade, respectively,

4.2.5 The single digit number following grade designation

being one-tenth of the measuring frequency, and

4.2.6 The last two-digit number indicating one-hundred

times the speciﬁed value of the minimum lamination factor.

5. Ordering Information

5.1 Order for materials conforming to the speciﬁcation shall

indicate the following information:

5.1.1 Reference to this speciﬁcation and year of issue

revision.

5.1.2 Reference to material name.

5.1.3 Depending upon the desired end use, other magnetic

properties such as speciﬁc exciting power, saturation magnetic

ﬂux density, residual ﬂux density and coercive ﬁeld strength

may need to be speciﬁed. The user is responsible for specifying

the limits on magnetic properties. The user also states whether

and what speciﬁc tests are required.

6. Dimensions

6.1 Width—Tolerances on nominal as-cast strip width shall

be 60.65 % of the speciﬁed purchase width.

6.2 Thickness—The nominal thickness shall be 0.025 mm

(0.001 in.) as measured by a 6.35 mm (0.25-in.) diameter anvil

micrometer. The nominal thickness may vary 60.005 mm

(60.0002 in.), but the maximum thickness variation across the

width shall be within 610 % of the mean thickness, or as

agreed upon between the user and the producer. Alternatively,

the nominal thickness may be determined by Eq 1:

d5m⁄ρ

·b·l(1)

where:

d= average calculated thickness of the test specimen in

metres,

m= mass of the specimen in kilograms,

b= width of the specimen in metres,

l= length of the specimen in metres, and

= conventional density of the specimen in kilogram per

cubic metre.

7. Material Requirements

7.1 Amorphous magnetic core alloys are composed princi-

pally of iron with small amounts of alloying elements such as

boron and silicon. Other chemical elements are in residual

amounts or can be added to improve fabrication or the physical

or magnetic properties. The chemistry is left to the discretion of

the producer. The producer shall provide, on request, a state-

ment of the nominal chemistry being supplied.

8. Sampling

8.1 A continuously cast strip in one coil without breaks will

constitute one test lot. In practice, this may represent quantities

up to 1000 kg (2200 lb), depending on the width of the strip.

8.2 Test samples normally shall be taken from both ends of

the continuous strip of each test lot. Other sample frequencies

may be used as agreed upon by the producer and the user.

8.3 For small coils, less than 45 kg (100 lb), and for coils

containing splices, the test lot shall be as agreed upon between

the producer and the user.

9. Physical and Mechanical Property Requirements

9.1 Density—The density shall be provided by the producer

to a precision of 650 kg/m

(60.05 g/cm

) as measured by

Test Method C693.

TABLE 1 Magnetic and Physical Properties of the Conventional Grades of Fe-based Amorphous Strip

Material Name

Nominal

Thickness

Maximum Speciﬁc Core Loss at

1.3 T (13 000 G)

W/kg (W/lb)

Maximum Speciﬁc Core Loss at

1.4 T (14 000 G)

W/kg (W/lb)

Minimum

Magnetic Flux

Density B at H=

80 A/m (1.0 Oe)

Minimum

Lamination

Factor

mm (in.) 50 Hz 60 Hz 50 Hz 60 Hz T (G)

AM11-25S6-90

0.025 (0.001) 0.08 (0.036) 0.11 (0.050) 0.11 (0.050) 0.14 (0.064) 1.35 (13 500)

0.90

AM11-25S6-88 0.88

AM11-25S6-86 0.86

AM11-25S6-84 0.84

AM13-25S6-90

0.025 (0.01) 0.10 (0.045) 0.13 (0.059) 0.13 (0.059) 0.17 (0.077) 1.35 (13 500)

0.90

AM13-25S6-88 0.88

AM13-25S6-86 0.86

AM13-25S6-84 0.84

AM15-25S6-90

0.025 (0.001) 0.12 (0.055) 0.15 (0.068) 0.16 (0.073) 0.20 (0.091) 1.35 (13 500)

0.90

AM15-25S6-88 0.88

AM15-25S6-86 0.86

AM15-25S6-84 0.84

A901 − 19

TABLE 2 Magnetic and Physical Properties of the High Permeability Grades of Fe-based Amorphous Strip
Material Name
Nominal
Thickness
Maximum Speciﬁc Core Loss at
1.3 T (13 000 G)
W/kg (W/lb)
Maximum Speciﬁc Core Loss at
1.4 T (14 000 G)
W/kg (W/lb)
Minimum
Magnetic Flux
Density B at H=
80 A/m (1.0 Oe)
Minimum
Lamination
Factor
mm (in.) 50 Hz 60 Hz 50 Hz 60 Hz T (G)
AM11-25P6-90
0.025 (0.001) 0.08 (0.036) 0.11 (0.050) 0.11 (0.050) 0.14 (0.064) 1.50 (15 000)
0.90
AM11-25P6-88 0.88
AM11-25P6-86 0.86
AM11-25P6-84 0.84
AM13-25P6-90
0.025 (0.01) 0.10 (0.045) 0.13 (0.059) 0.13 (0.059) 0.17 (0.077) 1.50 (15 000)
0.90
AM13-25P6-88 0.88
AM13-25P6-86 0.86
AM13-25P6-84 0.84
AM15-25P6-90
0.025 (0.001) 0.12 (0.055) 0.15 (0.068) 0.16 (0.073) 0.20 (0.091) 1.50 (15 000)
0.90
AM15-25P6-88 0.88
AM15-25P6-86 0.86
AM15-25P6-84 0.84
9.2 Ductility—Strip bend ductility, with free solidiﬁcation
surface facing inward, shall be such that a minimum 1-m (39.4
in.) length of ribbon may be passed 180° around a 3-mm
(0.125-in.) polished steel rod without cracking or fracture.
Alternatively, the acceptable number of brittle spots shall be
determined by agreement between the producer and the user.
Further information is found in Appendix X3.
9.3 Thermal Expansion—The nominal coefficient of thermal
expansion shall be reported for the temperature range 40 to
400°C (104 o 752°F).
9.4 Thermal Conductivity—The average value measured
across the width shall be reported for temperatures of 25, 100,
and 400°C (77, 212, and 572°F). These values of thermal
conductivity of the material shall not differ from the published
values by more than 20 %.
9.5 Electrical Resistivity—The electrical resistivity shall be
reported as measured by Test Method A712.
9.6 Lamination Factor—The minimum lamination factor of
each grade of as-cast material measured in accordance with
Test Method A900/A900M is given in Table 1 and Table 2. The
lamination factor for coated material shall be as agreed
between the producer and the user.
9.7 Surface—The strip surface and edges shall have no
wrinkles, dimples, cracks, folds, ﬂakes, or other injurious
imperfections that would make the material unsuitable for the
fabrication of transformer cores.
9.8 Edge—The strip edge shall have no slivers with a
maximum dimension exceeding 3.0 mm (0.12 in.).
9.9 Holes—The strip shall have no holes exceeding 5 mm
(0.2 in.). Maximum hole frequency, visible against a light
source, shall not be more than ﬁve per 25 mm (1 in.) of strip
length.
10. Magnetic Property Requirements
10.1 Test Procedure—The magnetic quality of each batch of
material (as deﬁned in 4.1) shall be determined by obtaining
test samples from both ends of a batch (or lot). These samples
shall be annealed in a dry, inert atmosphere with an applied
magnetic ﬁeld strength of at least 1600 A/m (20 Oe) using the
time and temperature sequence recommended by the producer.
The samples shall be in ﬂat strip form. The sample in a toroidal
form may be used as agreed upon between the producer and the
user. See 1.2 for an example of typical heat treatment condi-
tions. Demagnetizing factor should be considered when a
magnetic ﬁeld is applied to a ﬂat strip for magnetic ﬁeld
annealing.
10.2 Amorphous magnetic core alloys are purchased to
speciﬁed maximum speciﬁc core loss requirements. The user
shall make clear to the producer the limiting values of core loss
required for the ordered material. The maximum speciﬁc core
loss values in Table 1 and Table 2 are to be determined
following the procedures given in Test Method A932/A932M.
10.3 Typical physical and magnetic properties of iron-based
amorphous alloys are listed in Table X1.1,Table X1.2, and
Table X2.1 of the appendixes.
11. Product Uniformity Veriﬁcation
11.1 Since it is assumed that the process will give essen-
tially identical properties to all parts of a coil, and that test
samples are taken at only both ends of a coil, it remains for the
producer to verify the uniformity of this product. At regular
time intervals, the producer shall perform appropriate tests at
regular (length) intervals to verify the uniformity of magnetic
and mechanical properties throughout the length of a coil.
11.2 Veriﬁcation of uniformity test results as obtained in
11.1 shall be made available to the user when requested.
12. Packaging and Marking
12.1 The strip shall be free from rust, ﬁngerprints, and
grease. No continuous streaks of oxide shall be visible along
the surface or edges of the strip.
12.2 Spool—The inside diameter of the spool hub shall be
406 63mm(1660.1 in.). The outside diameter of the strip
wound on this spool shall be at least 762 mm (30 in.) and shall
not exceed 1067 mm (42 in.).
12.3 There shall be no more than three breaks in the strip
per spool. At any break, the strip ends shall be sheared square,
butted, and joined with tape which shall extend substantially
across the width of the strip, but not beyond the strip edges.
12.3.1 The tape shall have the following characteristics:
tape thickness no greater than the strip thickness; tape base
material and adhesive capable of withstanding the normal
A901 − 19
3
 

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摘要：

ASTM A901 - 19 是美国材料与试验协会（ASTM）发布的关于半成品型软磁合金的标准化规范，主要适用于镍铁基和钴铁基等磁性合金材料的化学成分、磁性能及机械性能要求。该标准的最新版本2019年版在原有基础上进行了技术更新，明确了不同等级材料的磁导率、矫顽力、饱和磁感应强度等关键指标，并规定了相应的测试方法与验收标准。ASTM A901 - 19 广泛应用于变压器、电感器、传感器及电机等电气与电子设备的制造领域，是确保磁性材料批次一致性与产品可靠性的重要参考文件。

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