Creating a Protective Coating Against Corrosion and Erosion on the Surface of the Parts using in Sour Environments

Ghasemi Tabasi, Hossein | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47640 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Kokabi, Amir Hossein
  7. Abstract:
  8. A concern in the production sour oil and gas is the corrosion caused by the acid gas H2S. Even though corrosion resistant alloys (CRA) have long been available as a material selection option that mitigates H2S corrosion, the carbon steel is in general more cost-effective for oil and gas facilities. The aim of this study is to investigate the mechanical properties of 410NiMo cladding on a low alloy steel substrate. In this investigation, two successive layers of ER410NiMo were clad on low alloy steel substrates. To reduce the likelihood of Hydrogen Induced Cracking (HIC) and producing stable hydrogen traps, Post Weld Heat Treatment (PWHT) was used. To characterize the mechanical properties of overlay layer, the phase composition and microstructure of the claddings were compared, and the mechanical behavior of the claddings was evaluated using tensile, bending and hardness test. X-ray diffraction was used to study the austenite resulting from the intercritical tempering of these soft martensitic stainless steel overlay layer. Sulfide stress corrosion cracking resistance was evaluated as per NACE TM0177-96 method. Results show that two stage PWHT have the maximum fraction of retained austenite as hydrogen trap which result in excellent toughness for the overlay layer and more resistance against SSC. The results of polarization test show decrease in icorr for overlay layer subjected to two-stage PWHT
  9. Keywords:
  10. Coating ; HIC ; Stainless Steel ; Martensitic Steels ; Hydrogen Sulfide ; Tempering ; Sour Gas

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