The quality control laboratory that supports companies in the development of their projects and products

SigmaTre lab is an independent Italian Laboratiry with almost 40 years of experience in Material Testing, we are considered one of the most worldwide well-known laboratory in the execution of accredited tests and a reliable partner for all the companies that transform metallic and non-metallic materials.
We are accredited ISO 17025 and we are always focused in research and technology for new products and equipment, to perform new test in order to guarantee our customers maximum results in the minimum time also thanks a cutting-edge technologies to guarantee process efficiency and safety. We manage each service in a personalized and timely manner, thanks also to our 7 company vehicles for the collection of materials and external NDT tests.

Our test range includes Mechanical Test, Fracture Mechanics, Metallographic Test, Chemical and Corrosion Test like HIC and SSC and Non destructive Test. We also are qualified by the major Engineering Company worldwide.HIC TEST
The test consist of exposing unstressed test specimens to one of the two standard test solution
-either Solution A, a sodium chloride (NaCl), acetic acid (CH3COOH) solution saturated with H2S at ambient temperature and pressure, or solution B, a synthetic seawater solution saturated with H2S at ambient temperature and pressure. After a specified time the test specimens shall be removed and evaluated. After testing, each specimen must be sectioned and each section must be polished metallographically and etched, so that cracks can be distinguished. The observed cracks are measured and their dimensions (lenght and thickness) are reported
in order to calculate the following ratios: CSR (Crack Sensitivity Ratio), CLR (Crack Lenght Ratio) e CTR (Crack Thickness Ratio). These ratios are calculated and reported for each section and the average for each test specimen.

The test addresses the resistance of metals to cracking failure under the combined action of tensile stress and corrosion in aqueous environments conatining hydrogen sulfide (H2S). This phenomenon is generally termed sulfide stress cracking (SSC) when operating at room temperature and stress corrosion cracking (SCC) when operating at higher temperatures. SSC of metals exposed to oilfield environments containing H2S was recognized as a materials failure problem by 1952. Laboratory data and field experience have demonstrated that even extrememly low concentrations of H2S may be sufficient to lead to SSC failure of susceptible materials.

For more information: