708.343.3444

SAE J423 Case Depth Testing

Case Depth Hardness Testing

SGS MSi can perform the following

  • Metallographic verification of a carburizing or carbonitriding heat treatment.
  • Depth verification of the carbon diffusion into the component surface.
  • Visually measure case depth using an optical microscope.
  • Testing in accordance with SAE J423
  • Case Carbon Analysis by Optical Emission Spectroscopy (OES)

Case depth examination is typically required to verify each carburizing or carbonitriding heat treat batch or lot. A gaseous atmosphere is generated within the furnace which diffuses into the component by the laws of equilibrium. The amount of time and the carbon potential of the atmosphere dictate the resulting total case depth and effective case hardness.

To test for the total case depth, the following is to be performed

  1. Section & prepare the sample for metallographic examination
  2. Etch the prepared metallographic specimen with a 3% Nital etchant to reveal the microstructure
  3. Measure the total case depth as the depth below the surface where no change in microstructure can be observed resulting from heat treatment diffusion. A NIST traceable filar scale should be used for the measurement.
  4. Verify the depth measurement in at least three separate locations. Report the range observed. Do not average the values.
  5. Examine the case microstructure for any detrimental microstructural conditions and, if detected, notify the client.

Metallurgical Testing Services

Services Industries Materials Standards

Metallurgical Testing Services:

  • Case Depth
  • Microstructure Analysis
  • Decarburization
  • Microhardness
  • Grain Size Exam
  • Inclusion Rating
  • Macroetching Examinations
  • Salt Spray Testing
  • Plating Thickness
  • PPAP Testing
  • SEM - Scanning Electron Microscopy
  • EDS - Energy Dispersive Spectrometry
  • Gas Porosity Exam
  • Steel Manufacturing
  • Heavy Equipment
  • Transportation
  • Energy/Power
  • Aerospace
  • Agriculture
  • Consulting
  • Forging
  • Heat Treat
  • Fastener
  • Medical
  • Foundry
  • Plain Carbon
  • Alloy Steel
  • 300 x 400 Series SS
  • Titanium Alloys
  • Tool Steels
  • Nickel Base Alloys
  • Aluminum Base Alloys
  • Copper Base Alloys
  • Brass
  • Cast Irons
  • Case Depth (SAE J423)
  • Rockwell Hardness Testing A, B, C, N, T (ASTM E18, F606, F606M, SAE J429)
  • Brinell Hardness Testing - 87.5, 500, 750, 3000Kg (ASTM E10)
  • Microhardness (Knoop & Vickers) 100, 500 HK ,100, 300, 500, 1000 HK (ASTM E384, F606, F606M)
  • Vickers Hardness Testing HV 5000, HV 1000 (ASTM E384, ISO 6507-1)
  • Jominy Hardenability (ASTM A255)
  • Specimen Preparation (ASTM E3)
  • Macroetch Testing (ASTM E381)
  • Microetching Metals and Alloys (ASTM E407)
  • Grain Size Exam (ASTM E112, E1181)
  • Micro-Cleanliness Rating (ASTM E45 (Method A, C, D, E), ISO 4967 (Method A and B); DIN 50602 (Method K & L); JIS G 0555)
  • Discontinuity Exam (ASATM A574, F788, SAE J122, ISO 898-1)
  • Decarburization Exam (ASTM E1077, SAE J121, J419)
  • Volume Fraction by Point Count (ASTM E562, SAE AMS 2315)
  • Graphite Microstructure (ASTM A247)
  • SEM/EDS (ASTM B748, E766, E1508, MSi Proc. 2000)
  • Salt Spray (Fog) (ASTM B117, USCAR-1 GM 4298P, GM W3286, ISO 9227)
  • Intergranular Attack in Austenitic (SS) (ASTM A262 (Practice A & E))
  • Pitting and Crevice Corrosion ( ASTM G48 (Method A & B))
  • Detrimental Intermetallic Phases in Duplex Stainless Steels (ASTM A923)
  • Intergranular Corrosion in Nickel Chrome Alloys (ASTM G28 (Method A))
  • Inclusion or Second-Phase Content by Automatic Image Analysis (ASTM E1245))
  • Measurements by Optical Microscope Examination (ASTM B487; MSi Proc. 0008))
  • Coating Weight (Zn) (ASTM A90))

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