Category Archives: FAQs

A: At those temperatures in an oxygen rich environment you need to consider ceramic fasteners.  As long as your loads are not too high and thermal shock is not an issue, I think this would be your best option.  Since your hearth can … Continue reading

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A: To deal with both sulfuric/chloride atmospheres as well as high temperatures, you may want to consider Incoloy 800HT bolts or an Inconel 600 bolts depending on the concentrations of the acid gasses. Incoloy is an ideal material for long-term … Continue reading

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A: In terms of a material that is not metallic and can handle hydrochloric acid, I would suggest either PTFE or PVDF. PTFE is virtually inert to most acids, as well as bases. If you laboratory is working on anything organic, … Continue reading

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A: Inconel 625 and Hastelloy C276 bolts do offer similar corrosion resistance but Hastelloy C276 has a slight edge in many acidic environements, especially when fasteners are in hydrochloric (HCl) and sulfuric (H2SO4) acids. Though nickel is critical to corrosion … Continue reading

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A: You are right Alloy 20 does typically perform very well in sulfuric acid and even boiling sulfuric acid but only for a specific range.Not knowing your specific situation, it is most likely the concentration of acid you are working … Continue reading

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A: Super Duplex 2507 does provide good resistance to stress corrosion cracking, pitting and crevice corrosion in warm chloride environments to around 570 F, but I think in combination with the sour gas, and perhaps stress of your operation, it … Continue reading

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A: Overall MP35N is perhaps the highest yield strength bolt material available to industry with a typical yield of 250 ksi compared to A286’s 111 ksi; though it is extremely expensive. A286 is a basic high temperature stainless steel material and … Continue reading

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Sound like a good applications for Inconel 718 bolts.  This material has a min ultimate tensile of 180 ksi and typically well into the 200+ range. Because its high nickel content it will do well in sour gas/corrosive environments and … Continue reading

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A:  Monel K500 is a common choice for  cyrogenic fasteners. It can handle temperatures as low as -200°F with virtually no change it is ductility or toughness – in fact at low temperatures K500 actually increases in tensile and yield strength. … Continue reading

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A: All grades of Hastelloy can handle air environments. C276 is also fine in moderately oxidizing environments. What is meant by a strong oxidizer is when it is exposed to oxidizing chemicals like ferric chlorides or highly concentrated nitric acid. … Continue reading

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