Metallurgical testing reveal microstructure, processes performed on the material during  manufacture and whether or not the materials meet the required specification(s) to ensure  durability in the intended use.    


The following tests are available:


Macroscopic Evaluation



Macroscopic Evaluation

Macro examination involves the use visual methods and instrumentation to detect surface-level properties such as grain flow, porosity and cracks.  For welds, characteristics such as weld size, fusion, penetration, profile, and weld discontinuities are examined.

Test Method / Specification is ASTM E340



Metallographic examination uses microscopy to provide information about the structure and characteristics below the  surface of metals. Samples are prepared using precision cutting, mounting, grinding, polishing techniques and etching. The findings are documented  with photomicrographs. 

Our metallography services include:

  • General microstructural analysis
  • Fractography
  • Grain Size (ASTM E112)
  • Volume  Fraction  by  Manual  Point  Count  (ASTM E562)


Corrosion testing is performed to assess the susceptibility of a metal to environmental attack and quantify its resistance to a corrosive environment.

Midwal Engineering performs the following corrosion tests:

  • Susceptibility  to  Intergranular  Attack  in  Austenitic Stainless Steels (ASTM A262 Practice B, C and E)
  • Susceptibility to Intergranular Corrosion in Wrought, Nickel-Rich, Chromium-Bearing Alloys (ASTM G28 Methods A)
  • Pitting Corrosion Resistance of Stainless Steels (ASTM G48 Method A)
  • Detrimental Intermetallic Phase in Duplex Stainless Steels (ASTM A923 Methods A and C)