Tag Archives: tantalum

Hastelloy vs Tantalum Bolts for Sulfuric Acid Corrosion in Lithium Extraction

Posted on January 3, 2018 by dean

Q:  I’m running a lithium extraction process where a mineral called spodumene is roasted in a mixture of sulphuric acid (95-97%) at at about 150°C to form lithium sulfate. I’ve to use Hastelloy C276 for some process equipment but I’m still experiencing corrosion. Please help. A:  Hastelloy C276 bolts typically … Continue reading →

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Alloy 20 fasteners for sulfuric acid corrosion

Posted on August 23, 2017 by dean

Q: I’m working with boiling sulfuric acid and tried Alloy 20 for some of my bolting but am having corrosion. I’m confused as I thought that is what they are best for. Any suggestions. A: You are right Alloy 20 does typically perform very well in sulfuric acid and even … Continue reading →

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Hastelloy C22 bolts for hydrochloric acid steel pickling

Posted on June 21, 2017 by dean

Q: We are running a steel pickling process are considering switching from a sulfuric acid process to hydrochloric acid. Our system currently uses Inconel 625 bolting. With this be sufficient? A: Inconel 625 is a good material for acid corrosion but for large system of hydrochloric acid, especially with the … Continue reading →

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Embrittlement of Tantalum bolts at high temperatures

Posted on June 8, 2017 by dean

Q: I chose Tantalum bolts for their corrosion resistance and high temperature capabilities and they are breaking. I’m running an application that fluctuates between 350 Celcius where there could be concentrated sulfuric acid contamination. I thought these would be excellent with high temperature acid exposure. Can you help me? I … Continue reading →

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Zirconium fasteners exposed to downstream oxidizers

Posted on May 25, 2017 by dean

Q: I’m using zirconium fasteners in a sulfuric acid process but they are showing corrosion. I’m not sure why as I’m well below boiling and only using 40% concentration. There may be some downstream contaminants, but not much. Any ideas? A: It is most likely the contaminants that are causing … Continue reading →

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Tantalum vs Monel fasteners in hydrogen fluoride

Posted on May 22, 2017 by dean

Q: I’m using hydrogen fluoride used in a manufacturing process to make refrigerants. I know it’s very corrosive and have tried both hastelloy and inconel fasteners, which I thought were super corrosion resistant. What am I doing wrong because the acid is still eating them? Should I try Tantalum? A: … Continue reading →

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Tantalum bolts for hot phosphoric acid

Posted on May 2, 2017 by dean

Q: I’m running a semiconductor wet chemical etching process that utilizes 85 % phosphoric acid at around 150-160°C. I need a material that can withstand this process. Super Duplex hex bolts are not cutting it. A: At that particular concentration and temperature high performance nickel alloys like Hastelloy C276 bolts … Continue reading →

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Bolts for high temperature vacuum furnace: Metal vs. Ceramic

Posted on February 8, 2017 by dean

Q: I’m using a high temperature vacuum furnace at 2500F. What type of material do you suggest using and is there any advantage of using a metal over a ceramic? A:   Under vacuum conditions with little to no oxygen present, there are some metallic options for fasteners which include … Continue reading →

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The Specialty Material Fasteners of a Star Wars X-Wing Fighter

Posted on December 21, 2016 by dean

NASA has been designing rockets and manned space ships for over 50 years, but nothing like the innovation needed to build a light-speed, fighter spacecraft. At Extreme Bolt, we supply the aviation industry with a diversity of fasteners made from extreme materials. Though Star Wars is a fictitious story, it … Continue reading →

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Fasteners for Vacuum Furnaces: What Material Is Best?

Posted on December 7, 2016 by dean

Vacuum furnaces offer engineers a unique processing environment: high temperatures, controlled atmospheres, and rapid cooling. This low contamination environment is perfect for brazing, sintering, and heat treatment. Due to the constant extreme temperatures (typically 1,100–1,500°C), choosing the right fastener material can be a challenge. This brief paper will give you an overview on what high … Continue reading →

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