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ASTM B853-98

(Specification)

Standard Specification for Powder Metallurgy (P/M) Boron Stainless Steel Structural Components

Standard Specification for Powder Metallurgy (P/M) Boron Stainless Steel Structural Components

SCOPE
1.1 This specification covers stainless steel powder metallurgy (P/M) structural components with a 7.8-g/cm  minimum density, which are fabricated from prealloyed powder consisting primarily of iron, chromium, nickel, molybdenum, and boron  and are intended for use in corrosive service.
1.2 The values stated in inch-pound units are to be regarded as the standard. The SI values given in parentheses are for information only.

General Information

Status
Historical
Publication Date
09-Oct-1998
ICS
77.160 - Powder metallurgy
Technical Committee
B09 - Metal Powders and Metal Powder Products
Drafting Committee
B09.11 - Near Full Density Powder Metallurgy Materials
Current Stage
Ref Project

Relations

Replaced By
ASTM B853-02 - Standard Specification for Powder Metallurgy (P/M) Boron Stainless Steel Structural Components
Effective Date
10-Oct-2002
Referred By
ASTM B925-15(2022) - Standard Practices for Production and Preparation of Powder Metallurgy (PM) Test Specimens
Effective Date
10-Oct-1998

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ASTM B853-98 - Standard Specification for Powder Metallurgy (P/M) Boron Stainless Steel Structural ComponentsASTM B853-98 - Standard Specification for Powder Metallurgy (P/M) Boron Stainless Steel Structural Components
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ASTM B853-98 - Standard Specification for Powder Metallurgy (P/M) Boron Stainless Steel Structural Components
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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: B 853 – 98
Standard Specification for
Powder Metallurgy (P/M) Boron Stainless Steel Structural
Components
This standard is issued under the fixed designation B 853; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope Ferric Chloride Solution
1.1 This specification covers stainless steel powder metal-
3. Terminology
lurgy (P/M) structural components with a 7.7-g/cm minimum
3.1 Definitions—Definitions of powder metallurgy terms
density, which are fabricated from prealloyed powder consist-
can be found in Terminology B 243. Additional descriptive
ing primarily of iron, chromium, nickel, molybdenum, and
2 information is in the Related Material section of Volume 02.05
boron and are intended for use in corrosive service.
of the Annual Book of ASTM Standards.
1.2 The values stated in inch-pound units are to be regarded
as the standard. The SI values given in parentheses are for
4. Ordering Information
information only.
4.1 Orders for components under this specification shall
2. Referenced Documents include the following information:
4.1.1 Dimensions (see Section 9),
2.1 ASTM Standards:
4.1.2 Chemical composition (see Section 6 and Table 1),
A 262 Practices for Detecting Susceptibility to Intergranu-
3 4.1.3 Density (see Section 7),
lar Attack in Austenitic Stainless Steels
4 4.1.4 Mechanical properties (see Section 8 and Table 2),
B 117 Practice for Operating Salt Spray (Fog) Apparatus
5 4.1.5 Certification (see Section 13),
B 243 Terminology of Powder Metallurgy
4.1.6 Reference to the standard.
B 311 Test Method for Density Determination for Powder
Metallurgy (P/M) Materials Containing Less than Two
5. Materials and Manufacture
Percent Porosity
5.1 Structural components shall be made by cold pressing
E 8 Test Methods for Tension Testing of Metallic Materials
and sintering prealloyed powder.
E 354 Test Methods for Chemical Analysis of High-
5.2 The sintering temperature is dependent on the chemical
Temperature, Electrical, Magnetic, and Other Similar Iron,
7 composition of the powder.
Nickel, and Cobalt Alloys
E 572 Test Method for X-Ray Emission Spectrometric
6. Chemical Composition
Analysis of Stainless Steel
6.1 The material shall conform to the composition limits
E 1019 Test Methods for Determination of Carbon, Sulfur,
specified in Table 1.
Nitrogen, and Oxygen in Steel and in Iron, Nickel, and
8 6.2 Chemical analysis should be made in accordance with
Cobalt Alloys
Test Methods E 354, E 572, E 1019, and E 1086.
E 1086 Test Method for Optical Emission Vacuum Spectro-
metric Analysis of Stainless Steel by the Point-to-Plane
7. Physical Properties
Excitation Technique
7.1 Density:
G 48 Test Method for Pitting and Crevice Corrosion Resis-
7.1.1 The sintered density shall be 7.7-g/cm minimum.
tance of Stainless Steels and Related Alloys by Use of
7.1.2 Density shall be determined in accordance with Test
Method B 311.
This specification is under the jurisdiction of ASTM Committee B-9 on Metal
Powders and Metal Powder Products and is the direct responsibility of Subcom-
8. Mechanical Properties
mittee B09.11 on Near Full Density Powder Metallurgy Materials.
8.1 The purchaser and manufacturer shall agree upon the
Current edition approved Oct. 10, 1998. Published December 1998. Originally
published as B 853 – 94. Last previous edition B 853 – 94.
method to be used to verify the typical yield or tensile strength
U.S. Patents 3980444, 4014680, 4032336.
in the finished parts. The preferred method for verifying the
Annual Book of ASTM Standards, Vol 01.03.
tensile or yield strength is for the manufacturer and purchaser
Annual Book of ASTM Standards, Vol 03.02.
Annual Book of ASTM Standards, Vol 02.05. to agree upon a qualification test to be performed on the actual
Annual Book of ASTM Standards, Vol 03.01.
part. The specific test should be determined after consideration
Annual Book of ASTM Standards, Vol 03.05.
of the function of the part. An example would be measuring the
Annual Book of ASTM Standards, Vol 03.06.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
B 853
TABLE 1 Chemical Requirements
same mixed powder lot, compacted, and processed under the
Element Composition Limits, Weight % same conditions, and submitted for inspection at one time.
10.2 Chemical Analysis—If required by purchase agree-
Carbon 0.05 max
Manganese 2.00 max
ment, at least one sample for chemical analysis shall be taken
Phosphorus 0.03 max
from each lot. A representative sample of chips may be
Sulfur 0.03 max
obtained by dry-milling, drilling, or crushing at least two
Silicon 1.00 max
Chromium 22.00 to 24.00
pieces without lubr
...

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Standard Terminology of Powder Metallurgy

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1.1 This terminology standard includes definitions that are helpful in the interpretation and application of powder metallurgy terms.  
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Standard Test Methods for Flow Rate of Metal Powders Using the Carney Funnel

SIGNIFICANCE AND USE
5.1 The rate and uniformity of die cavity filling are related to flow properties, which thus influence production rates and uniformity of compacted parts.  
5.2 The ability of a powder to flow is a function of interparticle friction. As interparticle friction increases, flow is slowed. Some powders, often fine powders and lubricated powder mixtures, may not flow through the Hall funnel of Test Method B213. Nevertheless, if a larger orifice is provided, such as in the Carney funnel, a meaningful flow rate may be determined, providing specific information for certain applications.  
5.3 Test Method B213, using the Hall funnel, is the preferred method for determining the flowability of metal powders. The Carney funnel of these test methods should only be used when a powder will not flow through the Hall funnel. These test methods may also be used for comparison of several powders when some flow through the Hall funnel and some do not.  
5.4 Humidity and moisture content influence flow rate. Wet or moist powders may not flow through either the Hall or the Carney funnel.  
5.5 These test methods are based on flow of a specific mass of powder. If flow of a specific volume of powder is preferred, Test Method B855 may be used for powders that flow readily through the Hall funnel.  
5.6 These test methods may be part of the purchase agreement between powder suppliers and powder metallurgy (PM) part producers, or it can be an internal quality control test by either the supplier or the end user.
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1.1 These test methods cover the determination of a flow rate, by use of the Carney funnel, of metal powders and powder mixtures that do not readily flow through the Hall funnel of Test Method B213.  
1.2 This is a non-destructive quantitative test performed in the laboratory.  
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