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Sulfur resistant pipe fittings according to the NACE TM0177 (metal resistance to sulfide stress cracking in h2s environment and laboratory tests of stress corrosion cracking, and NACE MR0175 (oilfield equipment sulfide stress corrosion cracking and stress corrosion cracking resistance of metal materials) of international standards, the HTC (hydrogen induced cracking)/SWC ladder (cracking) test and SSC (sulfide stress cracking test, the results of the resistance to sulfur resistance to hydrogen accreditation. And high sulphur, high in the world of chlorine ion in the project, our company produces the high sulfur resistance to hydrogen pipe is suitable for the hydrogen sulfide content of 300 grams per cubic meters or more, 260 grams per liter or higher chloride ion content and a carbon dioxide 300 grams per cubic meters) or medium environment of acid wet natural gas and oil, and safe operation in the environment has been more than 15 years.
General requirements for corrosion resistant materials are as follows:
(1) Shall comply with the provisions of NACE MR0175 and NACE MR0103;
(2) Must be dead steel;
(3) Yield strength (s)
(4) Carbon equivalent CE
(5) Pipe fitting S≤0.01%(Wt),P≤0.015%(Wt);
(6) Supply shall be in the state of normalizing structure, and stress-relieving heat treatment shall be conducted after welding;
(7) The hardness of the weld and heat-affected zone shall not exceed 197HB and 120% of the hardness of the base material;
(8) The base material shall not have sharp defects with a depth greater than 0.5mm on the surface, or it may be changed according to the actual operating environment.
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