Correctly specifying materials in chemical process industries
The rapid failure of several 316 stainless steel pipes in a heat exchanger raised questions as to whether a manufacturing fault or service conditions were to blame. This second in a series of three case studies conducted by Dr. Elayaperumal examines the corrosion of stainless steel tubes in chloride solution and why duplex would have been the best material of choice.
SSY’s seaworthy steel
Drawing inspiration from Viking shipbuilding techniques, Håkan Rosén of SSY has developed a line of lightweight, environmentally-friendly patrol vessels out of two unlikely materials: hyper- and super-duplex stainless steel. The success of these innovative ships has prompted Rosén and his team at SSY to expand into new nautical markets and to look for other ways to apply their groundbreaking manufacturing techniques, all while maintaining a rigorous commitment to ethical business practices.
Machining tough alloys
A direct-drive spindle motor and linear guideways on a milling centre enable high speed metalcutting, but that configuration does not lend itself to efficient machining of highly alloyed nickels like Inconel or Duplex and Super Duplex stainless steels. A UK-based company recently searched for a better solution.
Treated superalloys demonstrate unprecedented heat resistance
Researchers at Idaho National Laboratory (INL) have discovered how to make “superalloys” even more super, extending useful life by thousands of hours. The discovery could improve materials performance for electrical generators and nuclear reactors.
Duplex forgings & tubes in chemical process industries: cautions to be exercised
While duplex stainless steels are the ideal material of choice for process equipment in the chemical process industries, care must be taken during specification, fabrication and storage. The next three issues of Stainless Steel World will present case studies conducted by Dr. Elayaperumal which illustrate the importance of these steps to be able to take advantage of the properties of duplexes in service.