ASTM A904-14
(Specification)Standard Specification for 50 Nickel-50 Iron Powder Metallurgy Soft Magnetic Parts
Standard Specification for 50 Nickel-50 Iron Powder Metallurgy Soft Magnetic Parts
ABSTRACT
This specification covers the magnetic property requirements of 50 nickel-50 iron soft magnetic parts fabricated by powder metallurgy techniques in the sintered or annealed conditions, intended for parts that require high magnetic permeability, high electrical resistivity, low coercive field strength, and low hysteresis loss. Magnetic parts shall be tested and adhere to chemical composition and sintered density requirements, to which magnetic and residual induction strongly depends on. Parts shall also be tested for their conformance to coercive field strength requirements. The user and producer shall agree upon a representative number of specimens for testing.
SCOPE
1.1 This specification covers the magnetic properties of 50 nickel-50 iron parts fabricated by powder metallurgy techniques and is intended for parts that require high magnetic permeability, high electrical resistivity, low coercive field strength, and low hysteresis loss. It differs from the wrought alloy specification (see Specification A753) because these parts are porous. A number of magnetic properties such as permeability are proportional to the sintered density.
1.2 This specification deals with powder metallurgy parts in the sintered or annealed condition. Should the sintered parts be subjected to any secondary operation that causes mechanical strain, such as machining or sizing, they should be resintered or annealed.
1.3 The values stated in customary (cgs-emu and inch-pound) units are to be regarded separately as standard. The values given in parentheses are mathematical conversions to SI units, which are provided for information only and are not considered standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:A904 −14
Standard Specification for
1
50 Nickel-50 Iron Powder Metallurgy Soft Magnetic Parts
This standard is issued under the fixed designation A904; 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 A753 Specification for Wrought Nickel-Iron Soft Magnetic
Alloys (UNS K94490, K94840, N14076, N14080)
1.1 This specification covers the magnetic properties of 50
A773/A773M Test Method for dc Magnetic Properties of
nickel-50 iron parts fabricated by powder metallurgy tech-
Materials Using Ring and Permeameter Procedures with
niques and is intended for parts that require high magnetic
dc Electronic Hysteresigraphs
permeability, high electrical resistivity, low coercive field
B328 Test Method for Density, Oil Content, and Intercon-
strength, and low hysteresis loss. It differs from the wrought
nected Porosity of Sintered Metal Structural Parts and
alloyspecification(seeSpecificationA753)becausetheseparts
3
Oil-Impregnated Bearings (Withdrawn 2009)
are porous. A number of magnetic properties such as perme-
B962 Test Methods for Density of Compacted or Sintered
ability are proportional to the sintered density.
Powder Metallurgy (PM) Products Using Archimedes’
1.2 This specification deals with powder metallurgy parts in
Principle
the sintered or annealed condition. Should the sintered parts be
E1019 Test Methods for Determination of Carbon, Sulfur,
subjected to any secondary operation that causes mechanical
Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt
strain,suchasmachiningorsizing,theyshouldberesinteredor
Alloys by Various Combustion and Fusion Techniques
annealed.
3. Terminology
1.3 The values stated in customary (cgs-emu and inch-
pound) units are to be regarded separately as standard. The 3.1 The terms and symbols used in this specification are
values given in parentheses are mathematical conversions to SI defined in Terminology A340.
units, which are provided for information only and are not
4. Ordering Information
considered standard.
4.1 Orders for parts conforming to this specification shall
1.4 This standard does not purport to address all of the
include the following information.
safety concerns, if any, associated with its use. It is the
4.1.1 Reference to this standard and year of issue/revision.
responsibility of the user of this standard to establish appro-
4.1.2 Reference to an applicable part drawing.
priate safety and health practices and determine the applica-
4.1.3 Quantity required.
bility of regulatory limitations prior to use.
4.1.4 Acritical cross section of the part shall be defined and
2. Referenced Documents
so indicated on the applicable part drawing.The location of the
2
critical section is by mutual agreement between the user and
2.1 ASTM Standards:
producer (see 6.2).
A34/A34M Practice for Sampling and Procurement Testing
4.1.5 Magnetic property requirements if they are other than
of Magnetic Materials
stated in 7.5.
A340 Terminology of Symbols and Definitions Relating to
4.1.6 Certification of chemical composition or magnetic
Magnetic Testing
property evaluation, or both (Sections 5 and 7).
A596/A596M Test Method for Direct-Current Magnetic
4.1.7 Marking and packaging requirements (Section 12).
Properties of Materials Using the Ballistic Method and
4.1.8 Exceptions to this specification or special require-
Ring Specimens
ments such as functional testing as mutually agreed upon by
1 the producer and user.
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. 5. Chemical Composition
Current edition approved May 1, 2014. Published May 2014. Originally
5.1 The chemical composition of the parts shall conform to
approved in 1990. Last previous edition approved in 2009 as A904–09. DOI:
10.1520/A0904-14. the requirements prescribed in Table 1.
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
3
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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A904−14
TABLE 1 Chemical Composition Requirements
7.5 Coercive Field Strength Requirements—Parts supplied
(in Weight Percent)
to this specification shall exhibit a maximum coercive field
Element %
strength of 0.4 Oe
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A904 − 09 A904 − 14
Standard Specification for
1
50 Nickel-50 Iron Powder Metallurgy Soft Magnetic Parts
This standard is issued under the fixed designation A904; 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 magnetic properties of 50 nickel-50 iron parts fabricated by powder metallurgy techniques and
is intended for parts that require high magnetic permeability, high electrical resistivity, low coercive field strength, and low
hysteresis loss. It differs from the wrought alloy specification (see Specification A753) because these parts are porous. A number
of magnetic properties such as permeability are proportional to the sintered density.
1.2 This specification deals with powder metallurgy parts in the sintered or annealed condition. Should the sintered parts be
subjected to any secondary operation that causes mechanical strain, such as machining or sizing, they should be resintered or
annealed.
1.3 The values stated in customary (cgs-emu and inch-pound) units are to be regarded separately as standard. The values given
in parentheses are mathematical conversions to SI units, which are provided for information only and are not considered standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
A34/A34M Practice for Sampling and Procurement Testing of Magnetic Materials
A340 Terminology of Symbols and Definitions Relating to Magnetic Testing
A596/A596M Test Method for Direct-Current Magnetic Properties of Materials Using the Ballistic Method and Ring Specimens
A753 Specification for Wrought Nickel-Iron Soft Magnetic Alloys (UNS K94490, K94840, N14076, N14080)
A773/A773M Test Method for dc Magnetic Properties of Materials Using Ring and Permeameter Procedures with dc Electronic
Hysteresigraphs
B328 Test Method for Density, Oil Content, and Interconnected Porosity of Sintered Metal Structural Parts and Oil-Impregnated
3
Bearings (Withdrawn 2009)
B962 Test Methods for Density of Compacted or Sintered Powder Metallurgy (PM) Products Using Archimedes’ Principle
E1019 Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt Alloys by
Various Combustion and Fusion Techniques
3. Terminology
3.1 The terms and symbols used in this specification are defined in Terminology A340.
4. Ordering Information
4.1 Orders for parts conforming to this specification shall include the following information.
4.1.1 Reference to this standard and year of issue/revision.
4.1.2 Reference to an applicable part drawing.
4.1.3 Quantity required.
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 Nov. 1, 2009May 1, 2014. Published December 2009May 2014. Originally approved in 1990. Last previous edition approved in 20042009 as
A904–04.–09. DOI: 10.1520/A0904-09.10.1520/A0904-14.
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.
3
The last approved version of this historical standard is referenced on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A904 − 14
4.1.4 A critical cross section of the part shall be defined and so indicated on the applicable part drawing. The location of the
critical section is by mutual agreement between the user and producer (see 6.2).
4.1.5 Magnetic property requirements if they are other than stated in 7.5.
4.1.6 Certification of chemical composition or magnetic property evaluation, or both (Sections 5 and 7).
4.1.7 Marking and packaging requirements (Section 12).
4.1.8 Exceptions to this specification or special requirements such as functional testing as mutually agreed upon by th
...
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