ASTM A904-09
(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. This specification does not cover parts produced by metal injection molding. Parts shall be tested and adhere to the chemical composition, sintered density and coercive field strength requirements listed in this specification. Appendices contain information on typical magnetic properties and heat treatment.
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.
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Designation:A904 −09
StandardSpecification 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 dc Electronic Hysteresigraphs
B328 Test Method for Density, Oil Content, and Intercon-
1.1 This specification covers the magnetic properties of 50
nected Porosity of Sintered Metal Structural Parts and
nickel-50 iron parts fabricated by powder metallurgy tech-
3
Oil-Impregnated Bearings (Withdrawn 2009)
niques and is intended for parts that require high magnetic
B962 Test Methods for Density of Compacted or Sintered
permeability, high electrical resistivity, low coercive field
Powder Metallurgy (PM) Products Using Archimedes’
strength, and low hysteresis loss. It differs from the wrought
Principle
alloyspecification(seeSpecificationA753)becausetheseparts
E1019 Test Methods for Determination of Carbon, Sulfur,
are porous. A number of magnetic properties such as perme-
Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt
ability are proportional to the sintered density.
Alloys by Various Combustion and Fusion Techniques
1.2 This specification deals with powder metallurgy parts in
the sintered or annealed condition. Should the sintered parts be
3. Terminology
subjected to any secondary operation that causes mechanical
3.1 The terms and symbols used in this specification are
strain,suchasmachiningorsizing,theyshouldberesinteredor
defined in Terminology A340.
annealed.
1.3 The values stated in customary (cgs-emu and inch-
4. Ordering Information
pound) units are to be regarded separately as standard. The
4.1 Orders for parts conforming to this specification shall
values given in parentheses are mathematical conversions to SI
include the following information.
units, which are provided for information only and are not
4.1.1 Reference to this standard and year of issue/revision.
considered standard.
4.1.2 Reference to an applicable part drawing.
4.1.3 Quantity required.
2. Referenced Documents
4.1.4 Acritical cross section of the part shall be defined and
2
2.1 ASTM Standards:
so indicated on the applicable part drawing.The location of the
A34/A34M Practice for Sampling and Procurement Testing
critical section is by mutual agreement between the user and
of Magnetic Materials
producer (see 6.2).
A340 Terminology of Symbols and Definitions Relating to
4.1.5 Magnetic property requirements if they are other than
Magnetic Testing
stated in 7.5.
A596/A596M Test Method for Direct-Current Magnetic
4.1.6 Certification of chemical composition or magnetic
Properties of Materials Using the Ballistic Method and
property evaluation, or both (Sections 5 and 7).
Ring Specimens
4.1.7 Marking and packaging requirements (Section 12).
A753 Specification for Wrought Nickel-Iron Soft Magnetic
4.1.8 Exceptions to this specification or special require-
Alloys (UNS K94490, K94840, N14076, N14080)
ments such as functional testing as mutually agreed upon by
A773/A773M Test Method for dc Magnetic Properties of
the producer and user.
Materials Using Ring and Permeameter Procedures with
5. Chemical Composition
5.1 The chemical composition of the parts shall conform to
1
This specification is under the jurisdiction of ASTM Committee A06 on
the requirements prescribed in Table 1.
Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on
Material Specifications.
5.2 Determination of metallic constituents shall be by a
Current edition approved Nov. 1, 2009. Published December 2009. Originally
method acceptable to both producer and user. Analysis of
approved in 1990. Last previous edition approved in 2004 as A904–04. DOI:
10.1520/A0904-09.
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
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A904−09
TABLE 1 Chemical Composition Requirements
7.6 Since magnetic properties are strongly affected by
(in Weight Percent)
process conditions, refer to the appendixes for typical values
Element %
and explanatory notes.
Nickel 46 -51
Carbon 0.02 max
8. Workmanship, Finish, and Appearance
Oxygen 0.10 max
Nitrogen 0.01 max
8.1 The parts shall be uniform in composition and uniform
A
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:A904–04 Designation: A904 – 09
Standard Specification for
50 Nickel-50 Iron Powder Metallurgy (P/M) Soft Magnetic
1
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 P/Mpowder 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.
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 TestMethodfordcMagneticPropertiesofMaterialsUsingRingandPermeameterProcedureswithdcElectronic
Hysteresigraphs
B328 TestMethodforDensity,OilContent,andInterconnectedPorosityofSinteredMetalStructuralPartsandOil-Impregnated
Bearings
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.
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).
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 MayNov. 1, 2004.2009. Published June 2004.December 2009. Originally approved in 1990. Last previous edition approved in 19982004 as
A904–98.A904–04. DOI: 10.1520/A0904-049.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book ofASTM 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.
1
---------------------- Page: 1 ----------------------
A904 – 09
4.1.7 Marking and packaging requirements (Section 12).
4.1.8 Exceptionstothisspecificationorspecialrequirementssuchasfunctionaltestingasmutuallyagreeduponbytheproducer
and user.
5. Chemical Composition
5.1 The chemical composition of the parts shall conform to the requirements prescribed in Table 1.
5.2 Determination of metallic constituents shall be by a method acceptable to both producer and user. Analysis of carbon,
nitrogen, sulfur, and oxygen shall be done in accordance with Test Methods E1019.
6. Sintered Density Requirements
6.1 Magnetic and residual induction of P/M powder metallu
...
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