SSCC (Sulfide Stress Corrosion Cracking) of pipeline steels is mainly influenced by materials and media system, also by the condition of load. Generally, from the point of load, the SSCC tests are classified as constant deformation test, constant load test, slow strain rate test (SSRT). Three point bent-beam test and four point bent-beam test are the kinds of constant strain tests. Constant load test defined by NAGE TM01 - 77 is carried out under the constant load condition, and it was used to study SSCC in this paper. Base metals of domestic pipeline steels were used to study the effect of Mn on corrosion properties of SSCC, and welds were carried out to study the effect of MnS on corrosion properties of HIC (Hydrogen Induced Cracking) both in solutions with wet hydrogen sulfide (H2S). They were respectively conducted by referring to the standards of SSCC and HIC. Testing results revealed that with the increase of content Mn, the resistance of SSCC will be decreased from the point of metallurgic view, and it is Mn element not C element to lead to the testing results of SSCC. Meanwhile even under the condition without inclusions MnS, HIC in welds still occurred. That is to say, MnS is not necessary for HIC the presence of local banded structures in which Mn and P are inclined to aggregate cause to the phenomena of HIC.
Effect of Mn and MnS on corrosion properties of domestic pipeline steels and welds
China Welding ; 13 , 2 ; 123-127
2004
5 Seiten, 6 Bilder, 3 Tabellen, 11 Quellen
Article (Journal)
English
Tensile and toughness properties of pipeline girth welds
Tema Archive | 2007
|DROPLET CORROSION ON CO2 TRANSPORT PIPELINE STEELS
TIBKAT | 2018
|Defect tolerance in pipeline girth welds
Tema Archive | 1984
|Assessment of properties and microstructure of X100 pipeline girth welds
Tema Archive | 2005
|Structure and properties of X80 and X100 pipeline girth welds
Tema Archive | 2004
|