Abstract
This specification covers ferrous metal injection molded (MIM) materials fabricated by mixing elemental or pre-alloyed metal powders with binders, injecting into a mold, debinding, and sintering with or without subsequent heat treatment. These materials are: low-alloy steel produced from admixtures of iron powder and other alloying elements such as nickel and molybdenum (MIM-2200 and MIM-2700); low-alloy steel produced from admixtures of iron powder and other alloying elements such as nickel, molybdenum, and carbon (MIM-4605); austenitic stainless steel produced from pre-alloyed powder or an admixture of powders (MIM-316L); precipitation hardening stainless steel produced from pre-alloyed powder or an admixture of powders (MIM-17-4 PH); and ferritic stainless steel produced from pre-alloyed powder or an admixture of powders (MIM-430L). Chemical analysis shall be performed for the elements copper, chromium, molybdenum, and nickel. The materials shall be subjected to tensile test and unnotched Charpy impact energy test.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1. Scope
1.1 This specification covers ferrous metal injection molded materials fabricated by mixing elemental or pre-alloyed metal powders with binders, injecting into a mold, debinding, and sintering, with or without subsequent heat treatment.
1.2 This specification covers the following injection molded materials.
1.2.1 Compositions:
1.2.1.1 MIM-2200, low-alloy steel
1.2.1.2 MIM-2700, low-alloy steel
1.2.1.3 MIM-4605, low-alloy steel
1.2.1.4 MIM-4140, low-alloy steel
1.2.1.5 MIM-316L, austenitic stainless steel
1.2.1.6 MIM-17-4 PH, precipitation hardening stainless steel
1.2.1.7 MIM-420, ferritic stainless steel
1.2.1.8 MIM-430L, ferritic stainless steel
1.3 Chemical composition limits are specified in Table 1.
TABLE 1 Chemical Composition Requirements For Metal Injection Molded Materials
| Material
Designation | | Fe | Ni | Cr | Co | Mo | C | Cu | Si | Mn | Nb + Ta | V | Other |
| MIM-2200 | Min. | Bal. | 1.5 | - | - | - | - | - | - | - | - | - | - |
| | Max. | Bal. | 2.5 | - | - | 0.5 | 0.1 | - | 1.0 | - | - | - | 1.0 |
| | | | | | | | | | | | | | |
| MIM-2700 | Min. | Bal. | 6.5 | - | - | - | - | - | - | - | - | - | - |
| | Max. | Bal. | 8.5 | - | - | 0.5 | 0.1 | - | 1.0 | - | - | - | 1.0 |
| | | | | | | | | | | | | | |
| MIM-4605 | Min. | Bal. | 1.5 | - | - | 0.2 | 0.4 | - | - | - | - | - | - |
| | Max. | Bal. | 2.5 | - | - | 0.5 | 0.6 | - | 1.0 | - | - | - | 1.0 |
| | | | | | | | | | | | | | |
| MIM-4140 | Min. | Bal. | - | 0.8 | - | 0.2 | 0.3 | - | - | - | - | - | - |
| | Max. | Bal. | - | 1.2 | - | 0.3 | 0.5 | - | 0.6 | 1.0 | - | - | 1.0 |
| | | | | | | | | | | | | | |
| MIM-316L | Min. | Bal. | 10 | 16 | - | 2 | - | - | - | - | - | - | - |
| | Max. | Bal. | 14 | 18 | - | 3 | 0.03 | - | 1.0 | 2.0 | - | - | 1.0 |
| | | | | | | | | | | | | | |
| MIM-420 | Min. | Bal. | - | 12 | - | - | 0.15 | - | - | - | - | - | - |
| | Max. | Bal. | - | 14 | - | - | 0.4 | - | 1.0 | 1.0 | - | - | 1.0 |
| | | | | | | | | | | | | | |
| MIM-430L | Min. | Bal. | - | 16 | - | - | - | - | - | - | - | - | - |
| | Max. | Bal. | - | 18 | - | - | 0.05 | - | 1.0 | 1.0 | - | - | 1.0 |
| | | | | | | | | | | | | | |
| MIM-17-4PH | Min. | Bal. | 3 | 15.5 | - | - | - | 3 | - | - | 0.15 | - | - |
| | Max. | Bal. | 5 | 17.5 | - | - | 0.07 | 5 | 1.0 | 1.0 | 0.45 | - | 1.0 |
2. Referenced Documents (purchase separately) 
The documents listed below are referenced within the subject standard but are not provided as part of the standard.
MPIF Standards
MPIFStandard63 Method for Density Determination of Metal Injection Molded (MIM) Components (Gas Pycnometer)
ASTM Standards
B243 Terminology of Powder Metallurgy
B311 Test Method for Density of Powder Metallurgy (PM) Materials Containing Less Than Two Percent Porosity
B933 Test Method for Microindentation Hardness of Powder Metallurgy (PM) Materials
B962 Test Methods for Density of Compacted or Sintered Powder Metallurgy (PM) Products Using Archimedes Principle
E8 Test Methods for Tension Testing of Metallic Materials
E18 Test Methods for Rockwell Hardness of Metallic Materials
E350 Test Methods for Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought Iron
E415 Test Method for Atomic Emission Vacuum Spectrometric Analysis of Carbon and Low-Alloy Steel
E1019 Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt Alloys by Various Combustion and Fusion Techniques
E1086 Test Method for Atomic Emission Vacuum Spectrometric Analysis of Stainless Steel by Point-to-Plane Excitation Technique
E1621 Guide for X-Ray Emission Spectrometric Analysis
F1089 Test Method for Corrosion of Surgical Instruments
Keywords
corrosion resistance; low-alloy steels; mechanical properties; metal injection molded parts; metal injection molded steels; metal injection molding (MIM); metal powders; MIM; PIM; powder injection molding; sintered steels; stainless steels; unnotched Charpy impact energy;
ICS Code
ICS Number Code 77.140.80 (Iron and steel castings); 77.160 (Powder metallurgy)
DOI: 10.1520/B0883-10E01
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