Sulfide Stress Corrosion with Crack (SSC) in Heat Affected Zone in Sour Gas Pipelines

Document Type : Review Paper

Authors
Jalil Jamali 1
Hosein Esmaeili Mazidi 2
Mohammad Amel Kashi paz 3
1 Mechanical Institute, Shoshtar University, Shoshtar – Iran
2 Islamic Azad University, Science and Research Branch, Khomein, Iran
3 4th Refinery, SPGC – Asaloyeh Bandar, Iran
Abstract
The aim of this survey is to check the probable formal cracks with the help of diverse Electrodes and also considering operational variables, by making the test parts in order to relevant standards and from the Pipes type which I used in Sour Gas pipeline which are Carbon Steel, type API5L and Austenite stainless Steel, type 316L so we are searching the resistance rate against Stress Corrosion and probable formed Cracks in heat affected zone (HAZ) and then finding a proper solution due to decreasing this phenomenon.
Microscopic researches on samples in Heat Affected Zone show that the most of samples in this zone have potential to form Cracks of Stress Corrosion are combination of two kind of Cracks, Inter granular Cracks and Tran granular Cracks, but samples with variable of Inter granular Cracks are more and more effective. The results show that the least Cracks are due to use of some Electrodes with base metal in accordance with Chemical combinations and also Electrodes with higher Ni ratio with base metal also combined Cracks due to test time,120 days and more Sulfide  in tension samples have increased. 

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  • Receive Date 22 April 2014
  • Revise Date 02 July 2014
  • Accept Date 07 August 2014