ASTM A182 specifies several common testing methods and inspection items to ensure the quality and performance of the components. Here are the details:
Chemical analysis
- Method: Usually, samples are taken from the material and analyzed using techniques like optical emission spectroscopy or wet chemical analysis.
- Inspection item: Verify that the chemical composition of the alloy or stainless steel meets the specified limits for the relevant grade.
Mechanical property tests
- Tensile test: Use a universal testing machine to pull a specimen until it breaks, measuring the minimum tensile strength, yield strength, and elongation.
- Impact test: Employ the Charpy or Izod impact test to determine the material’s toughness, especially important for components used in low – temperature applications.
Non – destructive testing
- Radiographic testing: Use X – rays or gamma – rays to detect internal defects such as voids, inclusions, or cracks.
- Ultrasonic testing: Utilize high – frequency sound waves to identify internal flaws and measure the thickness of the material.
- Magnetic particle testing: Applicable to ferromagnetic materials, it detects surface and near – surface cracks by using magnetic fields and magnetic particles.
Visual and dimensional inspection
- Visual inspection: Examine the components for surface defects like cracks, porosity, or improper finish.
- Dimensional inspection: Measure the dimensions of the pipe flanges, forged fittings, valves, and parts to ensure they are within the specified tolerances, including flange diameters, thicknesses, and bolt – hole sizes.
