The company can carry out SSCC, HIC test evaluation

Steel in wet hydrogen sulfide (H2S) environment, prone to hydrogen blistering (HB), hydrogen induced cracking (HIC) should be stress oriented hydrogen induced cracking (SOHIC), sulfide should stress corrosion cracking (SSCC) many forms of corrosion, resulting in disastrous consequences to the safety of the equipment. Therefore in wet hydrogen sulfide environment material selection to meet NACE MR0175< anti sulfide should stress crack of oilfield equipment metal materials > and NACE MR0103< corrosion of oil refining environment of anti sulfur should stress cracking material > etc.. Need to HIC materials, the SSCC test evaluation, to verify the material in wet hydrogen sulfide environment corrosion ability.
Anhui day big oil pipe Limited by Share Ltd Testing Center corrosion laboratory can be in accordance with the American Association of corrosion testing standards NACE, TM0177 HIC NACETM0284, SSC test evaluation, issued by the authority of the CNAS test report.
HIC test evaluation will be force test sample is arranged in the standard solution, after 96 h of immersion, remove the specimen test methods for assessing. Standard solution solution a and solution B. A solution to room temperature, atmospheric H2S saturated sodium chloride (NaCl) and acetic acid (NaCl, CH3COOH); B solution to room temperature, atmospheric H2S saturated synthetic seawater solution. According to the Hydrogen Bulge bubble (HB), area, as well as the crack length ratio (CLR), crack thickness ratio (CTR), crack sensitive rate (CSR) index assessment of HIC resistance performance of material.
Refers to the evaluation of SSCC test in wet hydrogen sulfide (H2S) environment, under tensile stress, anti cracking test method of metal. There are four kinds of test methods: A - standard tensile test method; B standard bent beam test; C - standard C ring test method; D the standard double cantilever beam (DCB) test. The standard solution is divided into A and B solution.A solution by acidification of H2S saturated aqueous solution. The pH value in the charge of H2S saturation, and the specimen before contact in 2.6 ~ 2.8. The test process could increase the pH value but not more than 4.0. A, C and D should use A test solution, unless specified requirements using B solution and.B solution is a solution by acidification and buffer, in charge of H2S saturation and specimen contact before the pH value of the solution in 3.4 ~ 3.6 between C and D. A, allow the use of this solution. During the experiment, the pH may increase, but not More than 4.0. Method B using the solution by 0.5% (volume fraction) of glacial acetic acid dissolved in distilled water or deionized water. Test cycle for 72 hours. In loading should force the test period and evaluation of specimens are broken or crack.