Abstract
Different coating systems were characterized using a commercial API 5CT steel grade L80 type 1, which is commonly used in the oil and gas industry. Two Ni-based alloys and one Co-based alloy were deposited by laser cladding. Two coatings were deposited (Ni-based alloy and a composite W-C/Co-base) by means of thermal spray process. It has been shown the presence of a hard heat affected zone (HAZ) in the substrate for the as-laser deposited coating. The main explanation for this HAZ is devoted to the heat gradient causing a gradient on the prior austenite grain size and consequently different martensite hardness along the HAZ. For the thermal sprayed coatings, no HAZ was formed due to low heat input process. All the studied coating systems seem to be very interesting for different technically demanding applications, such as, stress sulfide corrosion and wear resistance.
Highlights
In the petroleum industry the application of piping is mandatory in many part of the project for the production of oil and gas as well as transportation and refining
Co-base is mainly deposited by thermal spray process as described elsewhere [21-24]. The objective of this present study is to focus on the coating of a commercial steel grade type API 5CT grade L80 type 1 using two Nibased alloys (Inconel 625 and C276) and one Co-based alloy (Stellite) by means of laser cladding
There is a significant amount of studies of laser clad and thermal spray coating on steel substrate, this work was focused on a specific commercial API5CT grade L80 type 1 used for oil and gas industry
Summary
In the petroleum industry the application of piping is mandatory in many part of the project for the production of oil and gas (upstream) as well as transportation and refining (downstream). Most noble materials are demanded, such as austenitic steels, super alloys and/or composites ultra-high resistant materials. The manufacture of the entire pipe body using those noble materials can affect strongly the cost, since these materials are very expensive compared to C-Mn steels. A possible solution is to develop appropriate coatings using these noble materials on surface of C-Mn steel pipes. Thermal spraying is widely used to provide corrosion protection to ferrous metals or to change the surface properties of the sprayed items, such as improve the wear resistance or thermal conductivity. Thermal spray is defined as applying these coatings takes place by means of special devices/systems through which melted or molten spray material is propelled at high speed onto a cleaned and prepared component surface
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
