4.1.7Requirement for full or partial chemical analysis(see Section6.),and
4.1.8Other special requirements as mutually agreed
5.Materials and Manufacture
editor evaluating revision
5.1Parts shall be made by injection molding mixtures of metal powder with binders,debinding,and sintering,with or without subsequent heat treatment.The material shall conform to the designations in1.2.1and meet the chemical composition specified in
6.1and Table1.
6.Chemical Composition
6.1Metal injection molded material shall conform to the chemical requirements prescribed in Table1.
6.2Chemical analysis for the elements copper,chromium, molybdenum and nickel shall be determined in accordance with Test Method E415(preferred method),Test Method E350,Test Method E1479or other such method as shall be agreed upon between buyer and seller.Analysis of the element carbon shall be determined in accordance with Test Method E1019,via optical emission spectroscopy,or other method agreed upon between the purchaser and seller.
7.Mechanical Property Requirements
7.1Mechanical Properties:
TABLE1Chemical Requirements For Metal Injection Molded Parts
Material
Designation
Fe Ni Cr Mo C Cu Nb+Ta OTHER
MIM-2200Min.Bal.  1.5-0.00.0--0.0 Max.Bal.  2.5-0.50.1--  2.0 MIM-2700Min.Bal.  6.5-0.00.0--0.0 Max.Bal.8.5-0.50.1--  2.0 MIM-4605Min.Bal.  1.5-0.20.4--0.0 Max.Bal.  2.5-0.50.6--  2.0 MIM-316L Min.
Bal.10.016.0  2.00.00--0.0 Max.Bal.14.018.0  3.00.03--  2.0 MIM-17-4PH Min.Bal.  3.015.5-0.00  3.00.150.0 Max.Bal.  5.017.5-0.07  5.00.45  2.0
TABLE2Mandatory and Typical Mechanical Properties of Metal Injection Molded Low-Alloy Steels A
English Units
Material Designation Minimum Mandatory Values Typical Values Typical Values
Tensile Properties Tensile Properties Density Hardness
Ultimate Strength
Yield
Strength
Elongation
in1in.
Ultimate
Strength
Yield
Strength
Elongation
in1in.
Apparent Matrix B
103psi103psi%103psi103psi%g/cm3Rockwell
MIM-22003716204218407.645HRB
MIM-27005530206037267.669HRB
MIM-46055525116430157.562HRB
MIM-4605-HT C215190-24021527.548HRC55HRC
A Reprinted by permission from MPIF Standard35,“Materials Standard for Metal Injection Molded Parts”,1993/1994,Metal Powder Industries Federation,105College Road East,Princeton,NJ08540-6692.
Density determined in accordance with Test Methods B311and B328.Apparent hardness determined in accordance with Test Methods E18.Tensile properties determined on test bars prepared in accordance with MPIF Standard50and tested in accordance with Test Method E8.
B Converted from HK
100Microhardness,MPIF Standard51,Appendix B.
C These data were measured on test bars tempered for1hour at350°F.
TABLE3Mandatory and Typical Mechanical Properties of Metal Injection Molded Low-Alloy Steels A
SI Units
Material
Designation
Minimum Mandatory Values Typical Values Typical Values
Tensile Properties Tensile Properties Density Hardness
Ultimate Strength
Yield
Strength
Elongation
%
Ultimate
Strength
Yield
Strength
Elongation
%
Apparent Matrix B
MPa MPa in25.4mm MPa MPa in25.4mm g/cm3Rockwell MIM-220025511020290125407.645HRB
MIM-270038020520415255267.669HRB
MIM-460538017011440205157.562HRB MIM-4605-HT C14801310-1650148027.548HRC55HRC
A Reprinted by permission from MPIF Standard35,“Materials Standards for Metal Injection Molded Parts”,1993/1994,Metal Powder Industries Federation,105College Road East,Princeton,NJ08540–6692.S.I.values converted from English units in Table2.
Density determined in accordance with Test Methods B311or B328.Apparent hardness determined in accordance with Test Methods E18.Tensile properties determined on test bars prepared in accordance with MPIF Standard50and tested in accordance with Test Methods E8.
B Converted from HK
100Microhardness,MPIF Standard51,Appendix B.
C These data were measured on test bars tempered for1hour at
177°C
7.1.1The preferred method of verifying the acceptable performance of afinished part is a qualification test to be performed on an actual part.The specific test should be determined following consideration of the function of the part, and should be agreed upon between manufacturer and pur-chaser.
7.1.2Mandatory and typical mechanical properties of ma-terials covered by this specification are shown in Tables2-5.
7.1.3The tensile properties of MIM materials should be measured using test specimens prepared and evaluated in accordance with MPIF Standard50.
7.2Mechanical Property Test Methods:
7.2.1Tensile Test Method—When requested in the purchase order,tensile specimens shall be specially injection molded per MPIF Standard50,sintered,and heat treated if necessary, along with production parts.Tensile specimens shall be tested in accordance with Test Method E8.Yield strength shall be determined by the0.2%offset method.MPIF Standard50 governs the manufacture of the test bars,but the testing procedure is governed by Test Method E8.
8.Sampling
8.1Lot—Unless otherwise specified,a lot is a quantity of product produced under similar conditions so that the product within the lot is expected to be homogeneous in all significant attributes and submitted for inspection at one time.
8.2Testing—The manufacturer and purchaser shall mutu-ally agree upon the number of specimens to represent the lot for qualification,chemical or mechanical property testing.9.Inspection
9.1Inspection of the parts supplied under this specification shall be the responsibility of the manufacturer or a mutually agreed upon third party.
9.2If the purchaser desires that a representative witness the inspection and testing of the material prior to shipment,such a requirement shall be part of the purchase order.
10.Rejection
10.1Parts that fail to conform to the requirements of this specification may be rejected.Rejection should be reported to the manufacturer or supplier promptly and in writing.
11.Certification
11.1When specified in the purchase order,a manufacturer’s certification shall be furnished to the purchaser that the parts were manufactured,samples tested and inspected in accor-dance with this specification and found to meet its require-ments.When specified in the purchase order,a report of the test results shall be furnished.
12.Keywords
12.1mechanical properties;metal injection molding (MIM);metal injection molded parts;metal injection molded steels;metal powders;MIM;PIM;powder injection molding; sintered steels;stainless steels
TABLE4Mandatory and Typical Mechanical Properties of Metal Injection Molded Stainless Steels A
English Units
Material
Designation
Minimum Mandatory Values Typical Values Typical Values Tensile Properties Tensile Properties Density Hardness
Ultimate Strength
Yield
Strength
Elongation
%in1in.
Ultimate
Strength
Yield
Strength
Elongation%in
1in.
Apparent Matrix.
hard B
103psi103psi103psi103psi in.g/cm3Rockwell
MIM-316L6520407525507.667HRB
MIM-17-4PH11594413010667.527HRC
MIM-17-4PH-HT C155140417215867.533HRC40HRC A Reprinted by permission from MPIF Standard35,“Materials Standards for Met al Injection Molded Parts”,1993/1994,Metal Powder Industries Federation,105College Road East,Princeton,NJ08540-6692.
Density determined in accordance with Test Methods B311or B328.Apparent hardness determined in a
ccordance with Test Methods E18.Tensile properties determined on test bars prepared in accordance with MPIF Standard50and tested in accordance with Test Methods E8.
B Converted from HK
100Microhardness,MPIF Standard51,Appendix B.
C These data were measured on test bars heat treated to H900.
TABLE5Mandatory and Typical Mechanical Properties of Metal Injection Molded Stainless Steels A
SI Units
Material Designation Minimum Mandatory Values Typical Values Typical Values
Tensile Properties Tensile Properties Density Hardness
Ultimate Strength
Yield
Strength
Elongation
%
Ultimate
Strength
Yield
Strength
Elongation
%
Apparent Matrix.hard.B
MPa MPa in25.4mm MPa MPa in25.4mm g/cm3Rockwell
MIM-316L45014040515170507.667HRB
MIM-17-4PH795645489573067.527HRC
MIM-17-4PH-HT C107096541185109067.533HRC40HRC
A Reprinted by permission from MPIF Standard35,“Materials Standards for Metal Injection Molded Parts”,1993/1994Metal Powder Industries Federation,105College Road East,Princeton,NJ08540-6692.S.I.values converted from English units in Table3.
Density determined in accordance with B311or B328.Apparent hardness determined in accordance with ASTM E18.Tensile properties determined on test bars prepared in accordance with MPIF Standard50and tested in accordance with ASTM E8.
B Converted from HK
100Microhardness,MPIF Standard51,Appendix B.
C These data were measured on test bars heat treated to
H900.
The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.Users of this standard are expressly advised that determination of the validity of any such patent rights,and the risk of infringement of such rights,are entirely their own responsibility.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed everyfive years and if not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.Your comments will receive careful consideration at a meeting of the responsible technical committee,which you may attend.If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards,100Barr Harbor Drive,West Conshohocken,PA19428.

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