Sulfide stress corrosion (Sulfide Stress Corrosion Cracking, SSCC or SSC) is a special type of stress corrosion (SCC), but it is different from the usual stress corrosion. In the usual stress corrosion, the role of the environment is mainly anodic dissolution, while SSC is dominated by cathodic hydrogen filling. At present, the mechanism of SSC has not been fully revealed, but at present, most scholars tend to be caused by hydrogen, and sulfur ions or hydrogen sulfide can promote the diffusion of hydrogen into the material. In oil, natural gas (especially natural gas) long-distance pipeline, the sulfide stress corrosion cracking of high pressure and high strength pipeline will cause major safety accidents. Therefore, it is necessary to evaluate the anti SSC performance of pipeline steel and ensure the safety of pipeline. Test method and standard test scheme test standard sample require A method - standard tensile NACE TM0177-2005 GB/T4157-2006 ASTM G39-99 ISO 7539-2011 simulated working condition test to provide drawing temperature: 25 + 3 degree C force: yield strength 80% or user self determined test medium: solution A: chloroacetate 5%, glacial acetic 0.5%, satiety And hydrogen sulfide solution B: sodium chloride 5%, glacial acetic acid 0.23%, sodium acetate 0.4%, saturated hydrogen sulfide solution evaluation: fracture and crack B method standard bending beauty standard (three point bend): 67.3mm*4.57mm*1.52mm national standard (two points): wide 15-25mm, long 110mm-255mm, large loading stress (more than 200MPa) sample, thickness required 0.8-1.8m M C method -C shape ring beauty standard: outer diameter more than 15.9mm national standard: external diameter more than 15mm specific reference drawing D method - standard double cantilever beam Sino-American standard: 110mm*30mm*10mm four point bending method long 110mm-250mm, wide 15mm-50mm, thickness guest for GHSC sulfur hydrogen sulfide corrosion NACE TM0177-2005 reference sulphide test conditions should be tested according to the above test The specified requirements are carried out and the following additional requirements, choices and instructions are met. A) The CRA specimen forms a couple with the non-alloy steel (i.e. carbon steel) completely immersed in the test solution. According to the requirements of NACE TM0177-1996, the area ratio of non-alloy steel to the area of wetted CRA specimen should be between 0.5 and 1. Electrical insulation shall be provided between the loading fixture and the specimen and the coupled carbon steel. For evaluation of specific applications, CRA can be coupled to specimens of low alloy materials that will be coupled to it in use. (b) The experimental environment was NACE TM0177-1996 A solution with H2S partial pressure of 0.1 MPa and temperature of 24 + 3. The SSC test environment described in E2.5 can be used for evaluation of specific applications. Test equipment: the stress ring laboratory is strong, the stress ring is sufficient, SSC hydrogen sulfide stress corrosion test can be carried out at the same time 120 groups of tests, HIC test can be carried out at the same time 200 groups of tests. Tensile method: The length of specimen is more than 100 mm, the working section should be 25.4 mm long and the diameter should be 6.35 + 0.13 mm. Each group of three samples > > bending beam method: American Standard (three point bend): 67.3mm*4.57mm*1.52mm national standard (two points): wide 15-25mm, long 110mm-255mm, thickness required 0.8-1.8mm >>C method: outer diameter > 15.9mm national standard: outer diameter > 15mm concrete reference drawings > double cantilever beam: conventional sample > 101.6* 25.4*9.35mm; thin sample T > 4.76mm > > four Point bending: 110mm-250mm long, 15mm-50mm wide, thickness of customer supply (such as 5mm)