-Mechanical and Impact test down to –196°C
The purpose of a mechanical or of an impact testing is to determine the resistance, toughness and impact strength to fast and high-rate loading conditions of a valve component sample. This destructive test involves fracturing a notched specimen and measuring the amount of energy absorbed by the material during fracture.
-Chemical analysis check
Chemical analysis is the determination of the physical properties or chemical composition of samples of valve components to ensure they comply with project specification and material data sheets.
Pitting Corrosion ASTM G48 Method B test is generally used to identify, examine and evaluate the pitting corrosion in order to determine the extent of its effect. ASTM G48 Method B, Ferric Chloride Test involves exposing a specimen to a highly oxidizing acid chloride environment. The importance of this evaluation is to be able to determine the extent of pitting, either in a service application where it is necessary to predict the remaining life in a metal structure or to select the most pitting-resistant materials for service.The Corrosion test as per ASTM G 35 provides a way of evaluating the resistance of stainless steels and related alloys to inter granular stress corrosion cracking. This practice can be applied to wrought products, castings, weld metal of stainless steels or other materials to be used in environments containing sulfur or sulfides. See also Hydrogen-Inducted Cracking test (HIC) and Sulphide Stress Corrosion Cracking (SSCC).
A microscopic examination is a preliminary testing performed through optic microscopes and in some cases a Scanning Electron Microscope (SEM), and corresponds to a large part to what is called a metallographic examination. There may be residual effects of industrial processes and treatments such as inclusion or contaminants that can be explained by microstructure analysis.
Fully austenitic stainless steel weld deposits have a tendency to develop small fissures even under conditions of minimal restraint. Cracks are clearly injurious defects and cannot be tolerated. Ferrite check provides sufficient control in most applications where minimum ferrite content or a ferrite range is specified.
-Hydrogen-Inducted Cracking test (HIC)
Hydrogen-Induced Cracking (HIC) Test, NACE TM0284, performed to evaluate the resistance of pipeline and pressure vessel plate steels to Hydrogen Inducted Cracking caused by hydrogen absorption from aqueous sulfide corrosion. An unstressed test specimen is exposed to a solution at ambient temperature and pressure and after a specified time, the test specimen is removed and evaluated.
-Sulphide Stress Corrosion Cracking (SSCC)
Sulfide Stress Corrosion Cracking (SSC), NACE TM 0177 is a form of hydrogen embrittlement cracking which occurs when a susceptible material is exposed to a corrosive environment containing water and H2S at a critical level of applied or residual tensile stress.
-Salt Spray (Neutral/Fog)
This is the most commonly used salt spray for testing of inorganic and organic coatings, especially where such tests are used for material or product specifications. Salt Spray testing is a tool for evaluation the uniformity of thickness and degree of porosity of metallic and nonmetallic protective coatings. A number of samples can be tested at once depending upon their size