ASTM A726M-92

ASTM A72bM 92 0759510 0534763 285
AMERICAN SOCIETY FOR TESTING AND MATERIALS
i916 RaceSt Philadelphia, Pa 19103
Designation: A 726M - 92
Reprinted irom the Annual Baokof ASTM Standards. Copyrlght ASTM
If not listed in the current combined index, will appear in the next edition.
METRIC
Standard Specification for
Cold-Rolled Magnetic Lamination Quality Steel,
Semiprocessed Types (Metric)’
This standard is issued under the fixed designation A 726M: the numhcr immcdiately following the designation indicatcs the ycar of
original adoption or, in the ease of revision. the year of last revision. A number in parciillicses indicates the ycar of Ias1 reapproval. A
superscript epsilon (6) indicates an editorial change since the last revision or reapproval.
E 140 Hardness Conversion Tables for Metals-Relation-
1. Scope
ship Between Brinell Hardness, Vickers Hardness,
1.1 This specification covers cold-rolled carbon sheet steel
Rockwell Hardness, Rockwell Superficial Hardness and
used for magnetic applications. These products, commonly
Knoop Hardness)
called “cold-rolled magnetic lamination steel” (CRML) are
usually intended for applications where the stamped lamina-
tions or assembled core structures for electrical equipment 3. Terminology
are annealed to develop the desired core loss and perme-
3.1 ikjìtiitìom (4’ ïi’rms Spn‘jjìc To ï‘liis Smihrd:
ability characteristics.
3.1.1 mrignetic ltnrinalioris steels-specialty cold-rolled
1.2 By using appropriate lamination annealing practices,
carbon sheet steel melted to controlled levels of carbon with
the purchaser can optimize magnetic properties for the
additions of manganese, phosphorus, silicon, and aluminum.
various types.
Residual elements are generally held as low as possible. The
1.3 A non-guaranteed core-loss type is usually made to
appropriate chemical composition combined with controlled
controlled chemical composition. However, magnetic prop-
mill processing results in a carbon sheet steel having mechan-
erties are not guaranteed by the producer.
ical properties and magnetic properties (after a quality
I .4 Higher quality core-loss types are made to controlled
dcvclopment anneal) desired for electrical applications.
chemical composition and are usually given critical reduc-
3. I .2 col~l-rollc~l .r/iwt-slicct manu fact iircd ïroin Iiot-
tion on a temper mill to yield specified magnetic properties
rolled descaled coils by cold reducing to the desired thick-
after a suitable’ lamination anneal. These products typically
ness, generally followed by annealing to recrystallize the
called semiprocessed lamination steel are classified by the
grain structure. In the case of magnetic lamination steels,
ASTM Code Letter D according to Specification
particularly semiprocessed lamination steels, temper rolling
A 664 - 87.*
is employed after annealing to enhance flatness and to
NOTE I-This specification is the metric companion to Specification optimize magnetic properties during the purchaser’s lamina-
AI26.
tion anneal.
3.2 Other terms and symbols used in this specification are
2. Referenced Documents
defined in Terminology A 340.
2.1 ASTM Standards:
A 340 Terminology of Symbols and Definitions Relating
4. Ordering Informafion
to Magnetic Testing2
4.1 Orders for material under this specification shall
A 343 Test Method for Alternating-Current Magnetic
include the following information, as required, to adequately
Properties of Materials at Power Frequencies Using
describe the required material:
Wattmeter-Ammeter-Voltmeter Method and 25-cm
4.1.1 ASTM specification number and date of issue,
Epstein Test Frame2
4. I .2 Core-loss type number,
A 370 Test Methods and Definitions for Mechanical
4.1.3 Finish (indicate typical profilometer range, as re-
Testing of Steel Products)
quired) (see 10.2),
A 664 Practice for Identification of Standard Electrical-
4.1.4 Specify not oiled or oiled, as required (see 10.4),
and Laminations-Steel Grades in ASTM Specifications2
4.1.5 Dimensions (nominal thickness and coil width) and
A 700 Practices for Packaging, Marking, and Loading
tolerances, if not standard (see 9. i),
Methods for Steel Products for Domestic Shipment4
4.1.6 Coil size (must include limitations on inside diam-
A 726 Specification for Cold-Rolled Magnetic Lamination
eter, oufside diameter, and maximum weight),
Quality Steel, Semiprocessed Types2
4. I .7 Application (scroll slit for hermetic motors, etc.),
E 18 Test Methods for Rockwell Hardness and Rockwell
4.1.8 Special requirements (indicate hardness range, mag-
Superficial Hardness of Metallic Materials)
netic limitations, etc.), and
or heat analysis and magnetic test report
4.1.9 Cast
(request if required).
I This specification is under the jurisdiction of ASTM Committee A-6 on
Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on
NOTE 2-A typical description is as follows:. Cold-Rolled Sheet.
Materials
...