SSCC test and HIC test for sulfur and hydrogen resistance of Lanzhou pipe fittings
Contact: Mr. Wang phone: 13102238283 (WeChat)
Tel: 022-23892103 email: 182@rd-test.com QQ:3144667033
Sulfide stress corrosion cracking (SSCC) test: it is now generally divided into constant tensile load, four point bending test, C ring experiment, U experiment, procurement standards in the petroleum and petrochemical is generally constant load and four point bending test, we can carry on the above Laboratory for testing, and in within the scope of the CNAS audit!
Four point bending test: four point tendency test should meet the requirements of ISO7539-2 or ASTM C39 sample preparation.
SSC hydrogen sulfide stress corrosion standards are as follows:
NACE TM NACE RM0175-2000 ASTM 0177-2005 G39-99
GB/T4157-2006 ISO15156-2001
How to determine the qualified unqualified is most concerned about the issue of customer: normal in our SMYS (theoretical yield strength) or AYS (the actual yield strength, provide 80% or 90%) loading force conditions, as long as 720 hours with no fracture, are regarded as qualified!
Test flow:
The stress corrosion test of H2S aqueous solution was carried out using tensile specimens with a diameter of 6.35mm. The tests were carried out on a constant load tensile stress corrosion test machine and by 80%ReL (ReL =?) The test period is 720 hours.
2.2 test equipment
P1500 constant load tensile stress corrosion testing machine
2.3 test procedure
(1) temperature and pressure conditions
In this study, the experimental temperature is chosen as the room temperature and the pressure is normal.
(2) test media (usually customer service)
Test medium for A solution. H2S saturated 5%NaCl+0.5% CH3COOH distilled water mixed solution, pH=2.8. Before H2S with nitrogen gas, oxygen. The pH value of the solution was not more than 4 during the experiment